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Objective Questions

Latest UKPSC Assistant Professor Chemistry Exam Question (Objective Questions), MCQ in English

Subjects : Chemistry

Question Bank UKPSC Assistant Professor (Chemistry) Exam - English
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Chemistry

Question 1Single Answer
10-6 M NaOH is diluted 100 times. The pH of the diluted base is
  1. A
    between 7 and 8
  2. B
    between 5 and 6
  3. C
    between 6 and 7
  4. 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
  1. A
    1.93 A         
  2. B
    9.65 A
  3. C
    19.3 A        
  4. D
    0.965 A
Question 3Single Answer
The one which decreases with dilution is
  1. A
    molar conductance
  2. B
    conductance
  3. C
    specific conductance
  4. D
    equivalent conductance
Question 4Single Answer
Vapour pressure of pure ‘A’ is 70 mm of Hg at 25oC. It forms an ideal solution with ‘B’ 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 ‘B’ at 25oC is
  1. A
    28 mm   
  2. B
    56 mm
  3. C
    70 mm    
  4. D
    140 mm
Question 5Single Answer
A 6% solution of urea is isotonic with
  1. A
    1 M solution of glucose
  2. B
    0.05 M solution of glucose
  3. C
    6% solution of glucose
  4. D
    25% solution of glucose
Question 6Single Answer
In countries nearer to polar region, the roads are sprinkled with CaCl2. This is
  1. A
    to minimise the wear and tear of the roads
  2. B
    to minimise the snow fall
  3. C
    to minimise pollution
  4. D
    to minimise the accumulation of dust on the road
Question 7Single Answer
A compound of ‘A’ and ‘B’ crystallises in a cubic lattice in which ‘A’ atoms occupy the lattice points at the corners of the cube. The ‘B’ atoms occupy the centre of each face of the cube. The probable empirical formula of the compound is
  1. A
    AB2 
  2. B
    A2B
  3. C
    AB
  4. D
    AB3
Question 8Single Answer
In electrophilic aromatic substitution reaction, the nitro group is meta directing because it
  1. A
    decreases electron density at ortho and para positions
  2. B
    decreases electron density at meta position
  3. C
    increases electron  density at meta position
  4. 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 alcohol with
  1. A
    PCI5
  2. B
    PCI3
  3. C
    SOCl2 in presence of pyridine
  4. D
    dry HCl in the presence of anhydrous ZnCl2
Question 10Single Answer
The carbon bond length in benzene is
  1. A
    in between C2H6 and C2H4
  2. B
    same as in C2H4
  3. C
    in between C2H6 and C2H2
  4. D
    in between C2H4 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
  1. A
    methanal
  2. B
    propanal
  3. C
    propanone
  4. 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
  1. A
    CH3CH2OH
  2. B
    CH3 – C – CH3
  3. C
    (CH3)2CHOH 
  4. D
    CH3CHO
Question 13Single Answer
Arrange the following in the increasing of their. Basic strengths CH3NH2, (CH3)2NH, (CH3)2N, NH3
  1. A
    NH3, < (CH3)3N < (CH3)2NH < CH3NH2
  2. B
    NH3 < (CH3)3N < CH3NH2 < (CH3)2NH
  3. C
    (CH3)3N < NH3 < CH3NH2 < (CH3)2NH
  4. D
    CH3NH2 < (CH3)2NH < (CH3)3N , NH3
Question 14Single Answer
The one which has least iodine value is
  1. A
    sunflower oil 
  2. B
    ginger oil
  3. C
    ghee
  4. D
    groundnut oil
Question 15Single Answer
A diabetic person carries a packet of glucose with him always, because
  1. A
    glucose reduces the blood sugar level slowly
  2. B
    glucose increases the blood sugar level slowly
  3. C
    glucose reduces the blood sugar level
  4. 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
  1. A
    8000 
  2. B
    6470
  3. C
    7465
  4. D
    5360
Question 17Single Answer
At what temperature ill the RMS velocity of SO2 be the same as that of O2 at 303 K ?
  1. A
    403 K
  2. B
    303 K
  3. C
    606 K
  4. D
    273 K
Question 18Single Answer
Phenol is treated with bromine water and shaken well. The white precipitate formed during the process is
  1. A
    m–bromophenol
  2. B
    2, 4, 6 tribromophenol
  3. C
    2-4 dibromophenol
  4. D
    A mixture of o-and p-bromophenols
Question 19Single Answer
In thermite process the metal used as reducing agent is:
  1. A
    Nickel
  2. B
    Zinc
  3. C
    Sodium
  4. D
    Aluminium
Question 20Single Answer
Which of the following compounds on boiling with alkaline KMnO4 and subsequent acidification will not give benzoic acid?
  1. A
    Benzyl alcohol
  2. B
    Acetophenone
  3. C
    Anisole
  4. D
    Toluene
Question 21Single Answer
The base present in DNA, but not in RNA is:
  1. A
    Guanine
  2. B
    Adenine
  3. C
    Uracil
  4. D
    Thymine
Question 22Single Answer
The total number of lattice arrangements in different crystal system is:
  1. A
    7
  2. B
    3
  3. C
    8
  4. D
    14
Question 23Single Answer
Alcoholic potash is used to bring about :
  1. A
    Dehydrogenation
  2. B
    Dehydration
  3. C
    Dehydrohalogenation
  4. D
    Dehalogenation
Question 24Single Answer
Which of the following is the correct statement?
  1. A
    Order of a reaction has always an integral value
  2. B
    Mechanism of a reaction proposed is always final
  3. C
    Zero order reactions are multi-step reactions
  4. D
    Order of reaction can be predicted even without knowing the rate law
Question 25Single Answer
The unit of quantity of electricity is:
  1. A
    Ohm
  2. B
    Ampere
  3. C
    Coulomb
  4. D
    Volt
Question 26Single Answer
Which of the following organic compounds answers both iodoform test and fehling’s test ?
  1. A
    Methanal
  2. B
    Ethanol
  3. C
    Propane
  4. 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.
  1. A
    NO
  2. B
    H2
  3. C
    CO2 or CO
  4. 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
  1. A
    Balmer series
  2. B
    Lyman series
  3. C
    Bracket series
  4. D
    Paschen series
Question 29Single Answer
The alcohol obtained by the hydrolysis of oils and fats is:
  1. A
    Glycol
  2. B
    Glycerol
  3. C
    Propanol
  4. D
    Pentanol
Question 30Single Answer
Which of the following alloys is used for making magnets for hearing aids?
  1. A
    Alnico
  2. B
    German silver
  3. C
    Invar
  4. 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 + C2H5OH → CH3COOC2H5 +H2O
The decrease in the initial rate if each solution is diluted with an equal volume of water would be
  1. A
    2 times
  2. B
    4 times
  3. C
    0.25 times
  4. D
    0.5 times
Question 32Single Answer
Which one of the following can be classified as a Bronstead base?
  1. A
    NO3-
  2. B
    H3O+
  3. C
    CH3COOH
  4. 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 :
  1. A
    CaCl2 
  2. B
    NaCl
  3. C
    AlCl3 
  4. 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:
  1. A
    – 2.3 V
  2. B
    + 2.34 V
  3. C
    – 1.66 V
  4. 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):
  1. A
    72 g
  2. B
    36 g
  3. C
    48 g
  4. D
    24 g
Question 36Single Answer
How much of NaOH is required to neutralize 1500 cm3 of 0.1 N HCI?(Na = 23):
  1. A
    60 g
  2. B
    6 g
  3. C
    4 g
  4. D
    40 g
Question 37Single Answer
The boiling point of water is exceptionally high because:
  1. A
    Water molecule is not linear
  2. B
    Water molecule is linear
  3. C
    There is covalent bond between H and O
  4. D
    Water molecules associate due to hydrogen bonding
Question 38Single Answer
P4O10 is not used with to dry NH3 gas because:
  1. A
    P4O10 is basic and NH3 is acidic
  2. B
    P4O10 is acidic and NH3 is basic
  3. C
    P4O10 is not a drying agent
  4. D
    P4O10 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:
  1. A
    1
  2. B
    12.5
  3. C
    8
  4. 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)?
  1. A
    45
  2. B
    120
  3. C
    90
  4. D
    60
Question 41Single Answer
Excess of Na+ ions in our system causes:
  1. A
    High B.P.
  2. B
    Low B.P.
  3. C
    Diabetes
  4. D
    Anaemia
Question 42Single Answer
Which of the following is the most active chemically? 
  1. A
    Chlorine
  2. B
    Flourine
  3. C
    Lithium
  4. D
    Iodine
Question 43Single Answer
Which among the following is a Noble Gas?
  1. A
    Nitrogen
  2. B
    Hydrogen
  3. C
    Oxygen
  4. D
    Helium
Question 44Single Answer
Which among the following is known as White Vitriol?
  1. A
    Zinc Sulphate
  2. B
    Zinc Chloride
  3. C
    Zinc Phosphate
  4. D
    Zinc oxide
Question 45Single Answer
The oxidation number and the electronic configuration of sulphur in H2SO4 is:
  1. A
    + 4; 1s2 2s2 2p6 3s2
  2. B
    +2; +6; 1s2 2s2 2p6 3s2 3p2
  3. C
    +3; 1s2 2s2 2p6 3s2 3p1
  4. D
    +6; 1s2 2s2 2p6
Question 46Single Answer
The mass of 112 cm3 of CH4 gas at STP is:
  1. A
    0.16 g
  2. B
    0.8 g
  3. C
    0.08 g
  4. 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:
  1. A
    400 cm3
  2. B
    500 cm3
  3. C
    450 cm3
  4. D
    100 cm3
Question 48Single Answer
Reactions that have standard free energy changes less than zero always have equilibrium constant equal to
  1. A
    unity
  2. B
    greater than unity
  3. C
    less than unity
  4. 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:
  1. A
    – 142.5 kJ
  2. B
    + 142.5 kJ
  3. C
    – 285 kJ
  4. D
    + 285 kJ
Question 50Single Answer
A quantity of PCl5 was heated in a 10 dm3 vessel at 2500 C PCl5 (g) 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:
  1. A
    0.05
  2. B
    0.02
  3. C
    0.025
  4. D
    0.04
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