10-6 M NaOH is diluted 100 times. The pH of the diluted base is
A
between 7 and 8
B
between 5 and 6
C
between 6 and 7
D
between 10 and 11
Question 2Single Answer
In the electrolysis of acidulated water, it is desired to obtain 1.12 cc of hydrogen per second under STP condition. The current to be passed is
A
1.93 Aย ย ย ย ย
B
9.65 A
C
19.3 Aย ย ย ย ย
D
0.965 A
Question 3Single Answer
The one which decreases with dilution is
A
molar conductance
B
conductance
C
specific conductance
D
equivalent conductance
Question 4Single Answer
Vapour pressure of pure โAโ is 70 mm of Hg at 25oC. It forms an ideal solution with โBโ in which mole fraction of A is 0.8. if the vapour pressure of the solution is 84 mm of Hg at 25oC, the vapour pressure of pure โBโ at 25oC is
A
28 mm ย ย
B
56 mm
C
70 mm ย ย
D
140 mm
Question 5Single Answer
A 6% solution of urea is isotonic with
A
1 M solution of glucose
B
0.05 M solution of glucose
C
6% solution of glucose
D
25% solution of glucose
Question 6Single Answer
In countries nearer to polar region, the roads are sprinkled with CaCl2. This is
A
to minimise the wear and tear of the roads
B
to minimise the snow fall
C
to minimise pollution
D
to minimise the accumulation of dust on the road
Question 7Single Answer
A compound of โAโ and โBโ crystallises in a cubic lattice in which โAโ atoms occupy the lattice points at the corners of the cube. The โBโ atoms occupy the centre of each face of the cube. The probable empirical formula of the compound is
A
AB2ย
B
A2B
C
AB
D
AB3
Question 8Single Answer
In electrophilic aromatic substitution reaction, the nitro group is meta directing because it
A
decreases electron density at ortho and para positions
B
decreases electron density at meta position
C
increases electronย density at meta position
D
increases electron density at ortho and para position
Question 9Single Answer
The best method for the conversion of an alcohol into an alkyl chloride is by treating the alcoholย with
A
PCI5
B
PCI3
C
SOCl2ย in presence of pyridine
D
dry HCl in the presence of anhydrous ZnCl2
Question 10Single Answer
The carbon bond length in benzene is
A
in between C2H6ย and C2H4
B
same as in C2H4
C
in between C2H6ย and C2H2
D
in between C2H4ย and C2H2
Question 11Single Answer
The compound which is not formed during the dry distillation of a mixture of calcium formate and calcium acetate is
A
methanal
B
propanal
C
propanone
D
ethanal
Question 12Single Answer
An organic compound x is oxidised by using acidified K2Cr2O7. The product obtained reacts with phenyl hydrazine but does not answer silver mirror test. The possible structured of X is
A
CH3CH2OH
B
CH3ย โ C โ CH3
C
(CH3)2CHOHย
D
CH3CHO
Question 13Single Answer
Arrange the following in the increasing of their. Basic strengths CH3NH2, (CH3)2NH, (CH3)2N, NH3
A
NH3, < (CH3)3N < (CH3)2NH < CH3NH2
B
NH3ย < (CH3)3N < CH3NH2ย < (CH3)2NH
C
(CH3)3N < NH3ย < CH3NH2ย < (CH3)2NH
D
CH3NH2ย < (CH3)2NH < (CH3)3N , NH3
Question 14Single Answer
The one which has least iodine value is
A
sunflower oilย
B
ginger oil
C
ghee
D
groundnut oil
Question 15Single Answer
A diabetic person carries a packet of glucose with him always, because
A
glucose reduces the blood sugar level slowly
B
glucose increases the blood sugar level slowly
C
glucose reduces the blood sugar level
D
glucose increases the blood sugar level almost instantaneously
Question 16Single Answer
There are 20 naturally occurring among acids. The maximum number of tripeptides than can be obtained is
A
8000ย
B
6470
C
7465
D
5360
Question 17Single Answer
At what temperature ill the RMS velocity of SO2 be the same as that of O2 at 303 K ?
A
403 K
B
303 K
C
606 K
D
273 K
Question 18Single Answer
Phenol is treated with bromine water and shaken well. The white precipitate formed during the process is
A
mโbromophenol
B
2, 4, 6 tribromophenol
C
2-4 dibromophenol
D
A mixture of o-and p-bromophenols
Question 19Single Answer
In thermite process the metal used as reducing agent is:
A
Nickel
B
Zinc
C
Sodium
D
Aluminium
Question 20Single Answer
Which of the following compounds on boiling with alkaline KMnO4 and subsequent acidification will not give benzoic acid?
A
Benzyl alcohol
B
Acetophenone
C
Anisole
D
Toluene
Question 21Single Answer
The base present in DNA, but not in RNA is:
A
Guanine
B
Adenine
C
Uracil
D
Thymine
Question 22Single Answer
The total number of lattice arrangements in different crystal system is:
A
7
B
3
C
8
D
14
Question 23Single Answer
Alcoholic potash is used to bring about :
A
Dehydrogenation
B
Dehydration
C
Dehydrohalogenation
D
Dehalogenation
Question 24Single Answer
Which of the following is the correct statement?
A
Order of a reaction has always an integral value
B
Mechanism of a reaction proposed is always final
C
Zero order reactions are multi-step reactions
D
Order of reaction can be predicted even without knowing the rate law
Question 25Single Answer
The unit of quantity of electricity is:
A
Ohm
B
Ampere
C
Coulomb
D
Volt
Question 26Single Answer
Which of the following organic compounds answers both iodoform test and fehlingโs test ?
A
Methanal
B
Ethanol
C
Propane
D
Ethanal
Question 27Single Answer
10 dm3 of N2 gas and 10 dm3 of gas X at the same temperature and pressure contain the same number of molecules.
A
NO
B
H2
C
CO2ย or CO
D
All of these
Question 28Single Answer
When the electrons of hydrogen atoms return to L shell from shells of higher energy, we get a series of lines in the spectrum. This series is called
A
Balmer series
B
Lyman series
C
Bracket series
D
Paschen series
Question 29Single Answer
The alcohol obtained by the hydrolysis of oils and fats is:
A
Glycol
B
Glycerol
C
Propanol
D
Pentanol
Question 30Single Answer
Which of the following alloys is used for making magnets for hearing aids?
A
Alnico
B
German silver
C
Invar
D
Monel metal
Question 31Single Answer
One dm3 of 2M ethanoic acid is mixed with one dm3 of 3M ethanol to form an easter
CH3COOH + C2H5OHย → CH3COOC2H5 +H2O
The decrease in the initial rate if each solution is diluted with an equal volume of water would be
A
2 times
B
4 times
C
0.25 times
D
0.5 times
Question 32Single Answer
Which one of the following can be classified as a Bronstead base?
A
NO3-
B
H3O+
C
CH3COOH
D
NH4+
Question 33Single Answer
Gold sol is an electronegative sol. The amount of electrolyte required to coagulate a certain amount of gold sol is minimum in the case of :
A
CaCl2ย
B
NaCl
C
AlCl3ย
D
Na2SO4
Question 34Single Answer
Aluminium displaces hydrogen from acids, but copper does not. A Galvanic cell prepared by combining Cu/Cu2+ and Al/Al3+ has an emf of 2.0 V at 298 K. If the potential of copper electrode is +0.34 V, that of aluminium electrode is:
A
โ 2.3 V
B
+ 2.34 V
C
โ 1.66 V
D
+ 1.66 V
Question 35Single Answer
1.5 moles of O2 combine with Mg to form the oxide MgO. The mass of Mg that has combined is (Mg = 24):
A
72 g
B
36 g
C
48 g
D
24 g
Question 36Single Answer
How much of NaOH is required to neutralize 1500 cm3 of 0.1 N HCI?(Na = 23):
A
60 g
B
6 g
C
4 g
D
40 g
Question 37Single Answer
The boiling point of water is exceptionally high because:
A
Water molecule is not linear
B
Water molecule is linear
C
There is covalent bond between H and O
D
Water molecules associate due to hydrogen bonding
Question 38Single Answer
P4O10 is not used with to dry NH3 gas because:
A
P4O10ย is basic and NH3ย is acidic
B
P4O10ย is acidic and NH3ย is basic
C
P4O10ย is not a drying agent
D
P4O10ย reacts with moisture in NH3
Question 39Single Answer
A radioactive isotope has a half-life of 10 years. What percentage of the original amount of it remain after 20 years:
A
1
B
12.5
C
8
D
25
Question 40Single Answer
75% of a first order reaction is completed in 30 minutes. What is the time required for 93.75% of the reaction (in minutes)?
A
45
B
120
C
90
D
60
Question 41Single Answer
Excess of Na+ ions in our system causes:
A
High B.P.
B
Low B.P.
C
Diabetes
D
Anaemia
Question 42Single Answer
Which of the following is the most active chemically?ย
A
Chlorine
B
Flourine
C
Lithium
D
Iodine
Question 43Single Answer
Which among the following is a Noble Gas?
A
Nitrogen
B
Hydrogen
C
Oxygen
D
Helium
Question 44Single Answer
Which among the following is known as White Vitriol?
A
Zinc Sulphate
B
Zinc Chloride
C
Zinc Phosphate
D
Zinc oxide
Question 45Single Answer
The oxidation number and the electronic configuration of sulphur in H2SO4 is:
A
+ 4; 1s2ย 2s2ย 2p6ย 3s2
B
+2; +6; 1s2ย 2s2ย 2p6ย 3s2ย 3p2
C
+3; 1s2ย 2s2ย 2p6ย 3s2ย 3p1
D
+6; 1s2ย 2s2ย 2p6
Question 46Single Answer
The mass of 112 cm3 of CH4 gas at STP is:
A
0.16 g
B
0.8 g
C
0.08 g
D
1.6 g
Question 47Single Answer
The volume of water to be added to 100 cm3 of 0.5 N H2SO4 to get decinormal concentration is:
A
400 cm3
B
500 cm3
C
450 cm3
D
100 cm3
Question 48Single Answer
Reactions that have standard free energy changes less than zero always have equilibrium constant equal to
A
unity
B
greater than unity
C
less than unity
D
zero
Question 49Single Answer
In order to decompose 9g water 142.5 kJ heat is required. Hence the enthalpy of formation of water is:
A
โ 142.5 kJ
B
+ 142.5 kJ
C
โ 285 kJ
D
+ 285 kJ
Question 50Single Answer
A quantity of PCl5 was heated in a 10 dm3 vessel at 2500ย C PCl5 (g)ย PCl3 (g) + Cl2 (g) At equilibrium the vessel contains 0.1 mole of PCl5 and 0.2 mole of Cl2. The equilibrium constant of the reaction is:
A
0.05
B
0.02
C
0.025
D
0.04
Important Questions Package
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1.
UPSC Combined Geo Scientist Prelims Exam (Geology, Geophysicist, Chemist) Paper I - Hindi
Description : 3000 Question with Answer.
โน181[โน500]
2.
UPSC Combined Geo Scientist Prelims Exam (Geology, Geophysicist, Chemist) Paper I - Hindi
Description : 2000 Question with Answer.
โน151[โน500]
3.
UPSC Combined Geo Scientist Prelims Exam (Geology, Geophysicist, Chemist) Paper I - Hindi
Description : 1000 Question with Answer.
โน101[โน500]
4.
UPSC Combined Geo Scientist Prelims Exam (Geology, Geophysicist, Chemist) Paper I - English
Description : 3000 Question with Answer.
โน181[โน500]
5.
UPSC Combined Geo Scientist Prelims Exam (Geology, Geophysicist, Chemist) Paper I - English
Description : 2000 Question with Answer.
โน151[โน500]
6.
UPSC Combined Geo Scientist Prelims Exam (Geology, Geophysicist, Chemist) Paper I - English
Description : 1000 Question with Answer.
โน101[โน500]
7.
UPSC Combined Geo Scientist Preliminary Exam (Geology) Paper II - Hindi
Description : 2300 Question with Answer.
โน151[โน500]
8.
UPSC Combined Geo Scientist Preliminary Exam (Geology) Paper II - Hindi
Description : 1000 Question with Answer.
โน101[โน500]
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UPSC Combined Geo Scientist Preliminary Exam (Geology) Paper II - English
Description : 2000 Question with Answer.
โน151[โน500]
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UPSC Combined Geo Scientist Preliminary Exam (Geology) Paper II - English
Description : 3000 Question with Answer.
โน181[โน500]
11.
UPSC Combined Geo Scientist Preliminary Exam (Geology) Paper II - English
Description : 1000 Question with Answer.
โน101[โน500]
12.
UPSC Combined Geo Scientist Preliminary Exam (Chemist) Paper II - Hindi
Description : 3000 Question with Answer.
โน181[โน500]
13.
UPSC Combined Geo Scientist Preliminary Exam (Chemist) Paper II - Hindi
Description : 2000 Question with Answer.
โน151[โน500]
14.
UPSC Combined Geo Scientist Preliminary Exam (Chemist) Paper II - Hindi
Description : 1000 Question with Answer.
โน101[โน500]
15.
UPSC Combined Geo Scientist Preliminary Exam (Chemist) Paper II - English
Description : 1750 Question with Answer.
โน131[โน500]
16.
UPSC Combined Geo Scientist Preliminary Exam (Chemist) Paper II - English
Description : 1000 Question with Answer.
โน101[โน500]
17.
UPSC Combined Geo Scientist Preliminary Exam (Geology) Paper II - English (Old)
Description : 1000 Question with Answer
โน101[โน500]
18.
UPSC Combined Geo Scientist Preliminary Exam (Geology) Paper II Question Bank Book - English (Old)
Description : 1000 Question with Answer (Printed Material)
โน390[โน600]
Chemistry
Question 51Single Answer
Which of the following is not a synthetic fibre:
A
Anygora
B
Rayon
C
Nylon
D
Polyster
Question 52Single Answer
Which one of the following is not contained in Portland cement ?
A
Ca3Al2O6
B
Ca3SiO5
C
Ca2SiยญO4
D
Ca3(PO4)2
Question 53Single Answer
What is the reson for white cement to be white ?
A
It does not contain carbon
B
It does not contain silicon
C
It does not contain iron
D
It does not contain calcium
Question 54Single Answer
Which fertilizer is assimilated directly by the plant ?
A
Super phosphate
B
Nitrolim
C
Muriate of Potash
D
Humus
Question 55Single Answer
Which of the following chemicals is used in foam fire extinguishers ?
A
Aluminium sulphate
B
Copper sulphate
C
Cobalt sulphate
D
Nickel sulphateย
Question 56Single Answer
What is a mixture of potassium nitrate, powdered charcoal and sulphur called ?
A
Glass
B
Cement
C
paint
D
Gun powder
Question 57Single Answer
Which one of the following chemicals is used in beauty parlours for hair โ setting ?
A
Sulphur based
B
Phosphorus based
C
Silicon based
D
Iron basedย
Question 58Single Answer
Which one of the following is used as a mordant in dyeing and tanning industry ?
A
Magnesium oxide
B
Magnesium carbonate
C
Magnesium chloride
D
Magnesium sulphate
Question 59Single Answer
Which one of the following substances is used in the manufacture of safety matches ?
A
Red phosphorus
B
White phosphorus
C
Phosphorus trioxide (P2O3)
D
Black phosphorus
Question 60Single Answer
Which one of the following polymeric materials is used for making bullet proof jacket ?
A
Nylon โ6, 6
B
Rayon
C
Kevlar
D
Dacron
Question 61Single Answer
Which one of the following is another name of RDX
A
Cyanohydrin
B
Dextran
C
Cyclohexane
D
Cyclonite
Question 62Single Answer
Which one of the following is used as an explosive ?
A
Phosphorus trichloride
B
Mercuric oxide
C
Graphite
D
Nitroglycerine
Question 63Single Answer
Flint glass is obtained from which of the following ?
A
Zinc and barium borosilicate
B
Sand, red lead and potassium carbonate
C
Sodium aluminium borosilicate
D
Pure silica and zinc oxide
Question 64Single Answer
Which one of the following correctly defines the state of glass ?
A
Crystalline solid
B
Super cooled liquid
C
Condensed gas
D
Liquid crystal
Question 65Single Answer
Which one of the following is not used as fertilizer ?
A
Ammonium nitrate
B
Ammonium sulphide
C
Ammonium phosphate
D
Ammonium sulphateย ย
Question 66Single Answer
Which one of the following elements is needed in the human body to transfer electrical signals by nerve cells ?
A
Lithium
B
Sodium
C
Rubidium
D
Caesium
Question 67Single Answer
Which one of the following is NOT true for bleaching powder ?
A
It is used as a reducing agent in chemical industries
B
It is used for bleaching wood pup in paper factories
C
It is used for disinfecting drinking water
D
It is used for bleaching linen in textile industry
Question 68Single Answer
Hard glass having the same ingredientsas soft glass excepts.
A
hard glass have Na in place of K
B
hard glass having K in place of Na
C
hard glass having both Na and K
D
None of the above
Question 69Single Answer
A complete fertilizer provides
A
N,P, K
B
S, K, N
C
S, B, K
D
N, S, P
Question 70Single Answer
Antacids are commonly used to get rid of acidity in the Stomach. A commonly used antacid is.
A
sodium hydrogen phthalate
B
magnesium hydroxideย ย
C
calcium hydroxide
D
manganese acetate
Question 71Single Answer
Annealing of glass is done to.
A
make it brittle
B
make it opaque
C
make it transparent
D
None of the above
Question 72Single Answer
Petrochemicals are obtained from.
A
coal
B
petroleum
C
coal tar
D
All of these
Question 73Single Answer
The use of chemicals for treatment of diseases is called as.
A
isothermotherapy
B
angiotherapy
C
physiotherapy
D
chemotherapy
Question 74Single Answer
Which of the following is a hypnotic drug ?
A
luminal
B
salol
C
catechol
D
chemisol
Question 75Single Answer
Teflon is a polymer of which of the following monomers ?
A
Tetrafluoroethylene
B
Vinyl chloride
C
Acetylene dichlorideย ย
D
None of the above/More than one of the above
Question 76Single Answer
LPG used as domestic fuel chiefly containsโ
A
Methane
B
Propane
C
Ethylene
D
Butane
E
None of the above/More than one of the aboveย ย ย
Question 77Single Answer
Glass is a.
A
liquid
B
colloid
C
nonโcrystalline amorphous solid
D
crystalline solid
Question 78Single Answer
Which one of the following acids is used for etching glass ?
A
H2SO4
B
HNO3
C
HF
D
HCI
Question 79Single Answer
What is the purpose of adding plasticizers in paint manufacturing process ?
A
They act as a filmโforming constituent
B
They reduce the viscosity
C
They prevent the polymerization and condensation
D
They provide elasticity to the film and minimize its cracking
Question 80Single Answer
Which raw material is used in the preperation of soft glass ?
A
K2CO3, SiO2, CaCO3
B
K2CO3, SiO2, PbCO3
C
Na2CO3, SiO2, CaCO3
D
Na2CO3, SiO2,ย PbO
Question 81Single Answer
What is the composition of nitrolim โ a chemical fertilizer ?
A
Nitrogen and limestone
B
Calcium carbide and nitrogen
C
Calcium carbide and carbon
D
None of above
Question 82Single Answer
the major component used in preparation of different type of glasses is.
A
Silica
B
Sodium borate
C
Calcium silicate
D
Sodium silicate
Question 83Single Answer
Salts of which of the following elements provide colours to fireworks ?
A
Zinc and sulphur
B
Potassium and mercury
C
Strontium and barium
D
Chromium and nickel
Question 84Single Answer
Given below are two statements :
Statement I : Phenyl is used as a household germicide.
Statement II : Phenyl is phenol derivative and phenol is an effective germicide.
In the light of the above statement, choose the correct answer from the options given below:
A
Both Statement I and II are correct and Statement II is the correct explanation of Statement I
B
Both Statement I and Statement II are true but Statement II is NOT the correct explanation of Statement I
C
Statement I is correct, but Statement II is incorrect
D
Statement I is incorrect, but Statement II is correct
Question 85Single Answer
Given below are two statements :
Statement I : Coalโbased thermal power stations contribute to acidโrain.
Statement II : Oxides of carbon are emitted when coal burns.
In the light of the above statement, choose the correct answer from the options given below:
A
Both Statement I and II are individually correct and Statement II is the correct explanation of Statement I
B
Both Statement I and Statement II are individiaully correct but Statement II is not the correct explanation of Statement I
C
Statement I is correct, but Statement II is incorrect
D
Statement I is incorrect, but Statement II is correct
Question 86Single Answer
Terfenadine is commonly used as a/an.
A
transquilizer
B
antihistamine
C
antimicrobial
D
antibiotic
Question 87Single Answer
Which one of the following is not a tranqualizer ?
A
Equanil
B
Veronal
C
Salvarsan
D
Serotonin
Question 88Single Answer
Barbituric acid and its derivatives are well known.
A
antipyreticsย ย ย
B
analgesics
C
antisepticsย ย
D
tranquilizersย
Question 89Single Answer
Which one among is not an analgesic ?
A
Ibuprofen
B
Naproxen
C
Aspirin
D
Valium
Question 90Single Answer
Various phenol derivatives, tincture of iodine (2 โ 3%) I 2 in (water/alcohol) and some dyes like methylene blue are.
A
antiseptics
B
disinfectants
C
analgesics
D
antipyretics
Question 91Single Answer
Commonly used antiseptics 'Dettol' is a mixture of.
A
oโchlorophenozylenol + terpeneol
B
oโcresol + terpeneol
C
phenol + terpeneol
D
chloroxylenol + terpeneol
Question 92Single Answer
Which of the following is not an antiseptic drug ?
A
Iodoform
B
Dettol
C
Gammexene
D
Genatian violet
Question 93Single Answer
Which one of the following substances is made from natural raw materials ?
A
Rayon
B
Nylon
C
Polyster
D
Polystyrene
Question 94Single Answer
The polymeric fibre used as a substitute for wool in making synthetic blankets, sweaters, etc. is.
A
nylon
B
teflon
C
orlon
D
bakelite
Question 95Single Answer
The cleaning of dirty clothes by soaps and detergents is deue to a type of molecules called surfactants, which are present in soaps and detergents. The surfactant molecules remove the dirt by.
A
making the cloth slippery
B
producing some gases between the dirt and the cloth
C
dissolving the dirt
D
forming some aggregates of themselves and take away the dirt in the core of the aggregates
Question 96Single Answer
Contact lenses are made from.
A
polyvinyl chloride
B
polystyrene
C
lucite
D
teflon
Question 97Single Answer
On of the occupational health hazards commonly faced by workers of ceramics, pottery and glass industry is.
A
stone formation in gall bladder
B
melanoma
C
silicosis
D
stone formation in kidney
Question 98Single Answer
vermicompost is an/a.
A
inorganic fertilizer
B
toxic substance
C
organic bio fertilizer
D
synthetic fertilizer
Question 99Single Answer
The macro nutrients provided by inorganic fertilizer are.
A
carbon, iron and boron
B
magnesium, manganese and sulphur
C
magnesiu, zinc and iron
D
nitrogen, phosphorus and potassium
Question 100Single Answer
Which one of the following statement is not correct ?
A
Water starts boiling when its vapour pressure becomes equal to amospheric pressure
B
Water is known as universal solvent
C
Permanent hardness of water is due to presence of MgClยญยญ2ยญ,ย CaCl2,ย MgSO4ย and CaSO4
D
Density of ice is greater than that of water
Question 101Single Answer
The appropriate regent required for carrying out the following transformation are
The CORRECT expression that corresponds to reversible and adiabatic expansion of ideal gas is ?
A
โU = 0
B
โH = 0
C
โS = 0
D
โG = 0
Question 127Single Answer
he behaviour of Cl2 is closest to ideal gas behaviour at ?
A
100โ and 10.0 atm
B
0โ and 0.50 atm
C
200โ and 0.50 atm
D
โ100โ and 10.0 atm
Question 128Single Answer
The electroyte AB2 ionises in water as T
he mean ionic activity coefficient (λยฑ) is
A
B
C
D
Question 129Single Answer
The reaction, A Products, follows first - order kinetics. If [A] represents the concentration of reactant at time t, the CORRECT variation is shown in ?
A
B
C
D
Question 130Single Answer
A vector is rotated through an angle and is also doubled in magnitude resulting in . An acceptable value of x is
A
1
B
2
C
3
D
4/3
Question 131Single Answer
With reference to the variation of molar conductivity (สm) with concentration for a strong electrolyte in an aqueous solution, the CORRECT statement is ?
A
The asymmetry effect contributes to decrease สm whereas the electrophoretic effect contributes to increase สm
B
The asymmetry effect contributes to increase สm whereas the electrophoretic effect contributes to decrease สm
C
Both asymmetry effect and electrophoretic effect contribute to decrease สm
D
Both asymmetry effect and electrophoretic effect contribute to increase สm
Question 132Single Answer
Consider the following six solid binary oxides: CaO, Al2O3, PbO, Cs2O, SiO2 and Sb2O3. The pair(s) of ionic oxides is(are)
A
CaO and Al2O3
B
CaO and PbO
C
Cs2O and Al2O3
D
SiO2ย and Sb2O3
Question 133Single Answer
For a reaction of the type A + b → Products, the unit of the rate constant is mol L-1s-1. The overall order of the reaction is ?
A
Zero
B
1
C
2
D
3
Question 134Single Answer
The thermodynamic criterion for spontaneity of a process in a system under constant volume and temperature and in the absence of any work other than expansion work (if any) is ?
A
Change in entropy is positive
B
Change in enthalpy is negative
C
Change in Helmholtz free energy is negative
D
Change in Gibbs free energy is negative
Question 135Single Answer
The number of vibrational mode (s) of a carbon dioxide molecule that can be detected using infrared spectroscopy id ?
A
1
B
2
C
3
D
4
Question 136Single Answer
For three non-coplanar vectors a,b and c the expression aโ (b x c) can be written as ?
A
(a x b) โ c
B
(a x b) โ (a x c)
C
(a โ b) x (a โ c)
D
(a โ b ) x c
Question 137Single Answer
Correct trend in the bond order is ?
A
O2+ >O22- > O2-
B
O2- > O2+ > O22-
C
O22- > O2- > O2+
D
O2+ > O2- > O22-
Question 138Single Answer
The correct option for the metal ion present in the active site of myoglobin, hemocyanin and vitamin B12,repectively, is ?
A
Iron, iron and zinc
B
Molybdenum, iron and copper
C
Iron, copper and cobalt
D
Molybdenum, copper and cobalt
Question 139Single Answer
The correct order of wavelength (λmax) of the halide to metal charge-transfer band of [Co(NH3)5I]2+(I),[Co(NH3)5Br]2+(II) and [Co(NH3)5l]2+ (III), is ?
A
III < II < I
B
I < II < III
C
II < III < I
D
I < III < II
Question 140Single Answer
The correct option for the major products of the following reaction is
(* represents isotopic ally labelled carbon atom)
A
B
C
D
Question 141Single Answer
The major product formed in the following reaction is ?
A
B
C
D
Question 142Single Answer
The complementary stand for the following single strand of DNA is ?
5โ← A−− T−−G −− C −− T → 3โ
A
3โ← T − − A − − C − − G − − A → 5โ
B
3โ← A − − T − − G − − C − − T → 5โ
C
5โ← T − − A − − C − − G − − A → 3โ
D
5โ← A − − A − − C − − G − − T → 3โ
Question 143Single Answer
The fractionย Has a minimum at ?
A
B
C
D
Question 144Single Answer
The correct option for the number of bending modes of vibration in each of H2O,CS2 and SO2 molecules, respectively, is ?
A
1, 2 and 2
B
2, 2 and 1
C
2, 1 and 2
D
1, 2 and 1
Question 145Single Answer
The total number of degrees if freedom of an HBr molecules that is constrained to translate along a straight line but does not have any constraints for its rotation and vibration is ?
A
6
B
5
C
4
D
3
Question 146Single Answer
According to the kinetic theory of gasses, e ratio of the root mean square velocity of molecular oxygen and molecular hydrogen at 300 K is ?
A
1 : 1
B
1 : 2√2
C
1 : 4
D
1 : 16
Question 147Single Answer
The half - life of the chemical reaction, A → Product , for initial reactant concentration of 0.1 and 0.4 mol L-1 are 200 and 50s, respectively. The order of the reaction is
A
Zero
B
1
C
2
D
3
Question 148Single Answer
16. The ratio of the nearest neighbor atomic distance in body - centered cubic(bcc) and facentered cubic (fcc) crystals with the same unit cell edge length is ?
A
B
C
D
1/2
Question 149Single Answer
The correct trend in the rate of substitution of Cl - by pyridine in the following complexes is ?
A
III < II < I < IV
B
II < III < I < IV
C
I < II < III < IV
D
III < II < IV < I
Question 150Single Answer
In qualitative inorganic analysis of metal ions, the ion which precipitates as sulfide in the presence of H2S in warm dilute HCL is ?
is rotated through an angle and is also doubled in magnitude resulting in 
. An acceptable value of x is
Has a minimum at ?
