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Objective Questions

Latest MPPSC Lecturer Exam Question (Objective Questions), MCQ in English

Subjects : Chemistry

Question Bank MPPSC Lecturer Exam Paper II (Chemistry) - English
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Chemistry

Question 1Single Answer
The correct value of the gas constant R is close to :
  1. A
    0.082 L- atm K-1 mo-1                
  2. B
    0.082 L- atm-1 K mol
  3. C
    0.082 L- atm K mol                      
  4. D
    0.082 L- atm-1 K mol       
Question 2Single Answer
A colloidal solution is kept in dark and is illuminated by a beam of light then brightness appears at the right angle of direction of light. This effect is called
  1. A
    Tyndall effect 
  2. B
    Brownian effect
  3. C
    Hardy-Schulze effect
  4. D
    None of these   
Question 3Single Answer
It is possible to obtain oxygen from air by fractional distillation because :
  1. A
    oxygen has lower density than nitrogen
  2. B
    oxygen is in different group of periodic table from nitrogen
  3. C
    oxygen is more active than nitrogen              
  4. D
    oxygen has higher boiling point than nitrogen   
Question 4Single Answer
The rise in the boiling point of a solution containing 1.8 g of glucose in 100 g of a solvent is 0.1°C. The molal elevation constant of the liquid is :
  1. A
    0.01 K/m                                      
  2. B
    0.1 K/m
  3. C
    1 K/m                                           
  4. D
    10 K/m             
Question 5Single Answer
Which of the following is a chiral compound ?
  1. A
    Hexane
  2. B
    n-Butane
  3. C
    Methane
  4. D
    2, 3, 4-Trimethylhexane.
Question 6Single Answer
If the enthalpy of vaporisation of water is 186.5 J/mol, the entropy of its vaporisation will be :
  1. A
    0.5 JK-1 mol-1                             
  2. B
    1.0 .JK-1 mol-1
  3. C
    1.5 JK-1 mol-1                              
  4. D
    2.0 JK-1 mol-1   
Question 7Single Answer
Gibbs free energy G, enthalpy H, and entropy are related as :
  1. A
    G - TS = H                                   
  2. B
    G = H + TS
  3. C
    S = H - G                                      
  4. D
    G = H – TS
Question 8Single Answer
Which of the following is the correct statement for PH3?
  1. A
    It is less poisonous than NH3
  2. B
    It is less basic than NH3
  3. C
    Electronegativity of PH3 > NH3
  4. D
    It does not show reducing properties
Question 9Single Answer
The half-life period for a zero order reaction is :
  1. A
    Inversely proportonal to the concentration  
  2. B
    Independent of the  concentration 
  3. C
    Directly proportional to the initial concentration                
  4. D
    Directly proportional to the final  concentration 
Question 10Single Answer
Which one  of the following statements is correct for a positive catalyst ?                                 
  1. A
    It initiates the reaction
  2. B
    It changes the state of equilibrium in favour of formation of product
  3. C
    It provides an alternative reaction path of lower activation energy
  4. D
    It provides activation energy to the reactants              
Question 11Single Answer
The IUPAC name of the compound : CH3CH2CH2 – C – CH3 based on latest nomenclature system is :
  1. A
    pentanone-2                             
  2. B
    pentan-2-one
  3. C
    2-pentanone                              
  4. D
    All of these      
Question 12Single Answer
In the elimination reactions, the reactivity of alkyl halides follows the sequence :
  1. A
    R - F > R - I > R - Br > R - Cl
  2. B
    R - F > R - Cl > R - Br > R - I
  3. C
    R - I > R - Br > R - Cl > R - F
  4. D
    R - I > R - F > R - Br > R – Cl           
Question 13Single Answer
If Si is doped with B,
  1. A
    n-type semiconductor is formed
  2. B
    p-type semiconductor is formed
  3. C
    insulator is formed
  4. D
    polymer is formed.
Question 14Single Answer
Which of the following has highest boiling point ?
  1. A
    (CH3)3N                                          
  2. B
    C2H5NHCH3
  3. C
    CH3CH2CH2NH2                          
  4. D
    NH2CH2CH2NH2
Question 15Single Answer
When alkyl halide reacts with aqueous sodium hydroxide to give alcohol, the reaction is called :
  1. A
    electrophilic substitution
  2. B
    nucleophilic substitution
  3. C
    free radical substitution
  4. D
    None of the above         
Question 16Single Answer
Threshold frequency of a metal is 5 × 1013 s–1 upon which 1 × 1014 s–1 frequency light is focused. Then the maximum kinetic energy of emitted electron is
  1. A
    3.3 × 10–21
  2. B
    3.3 × 10–20
  3. C
    6.6 × 10–21
  4. D
    6.6 × 10–20
Question 17Single Answer
The reaction between an alkyl halide and an alkoxide ion to give an ether is known as :
  1. A
    Williamson’s synthesis               
  2. B
    Clemmensen’s reduction
  3. C
    Fittig reaction                              
  4. D
    Wurtz reaction              
Question 18Single Answer
During bleaching of chlorine an antichlor is employed to :
  1. A
    eliminate last traces of bleaching agent
  2. B
    remove greases from the fibre
  3. C
    liberate oxygen
  4. D
    enhance bleaching action
Question 19Single Answer
The proper name for [Co(NH3)6]Cl3 :
  1. A
    hexamine cobalt trichloride
  2. B
    hexamine cobalt (III) chloride
  3. C
    hexamonia cobalt trichloride
  4. D
    cobalt hexamine chloride            
Question 20Single Answer
Sequence of acidic character is :
  1. A
    N2O5 > SO2 > CO > CO2
  2. B
    N2O5 > SO2 > CO2 > CO
  3. C
    SO2 > CO2 > CO > N2O5
  4. D
    SO2 > N2O5 > CO > CO2                 
Question 21Single Answer
Which is a metalloid ?
  1. A
    Manganese                                  
  2. B
    Phosphorus
  3. C
    Oxygen                                      
  4. D
    Arsenic            
Question 22Single Answer
The oxides, CrO3, MoO3 and WO3 are strongly :
  1. A
    neutral                                      
  2. B
    acidic
  3. C
    basic                                                           
  4. D
    None of these
Question 23Single Answer
Which is the correct order of the first ionisation potential of N, O and C ?
  1. A
    C > N > O                                     
  2. B
    O > N > C
  3. C
    C < N > O                                      
  4. D
    C > N ~ O         
Question 24Single Answer
Among the following statements the incorrect one is :
  1. A
    zinc blende and iron pyrites are sulphides
  2. B
    calamine and siderite are carbonates    
  3. C
    malachite and azurite are ores of copper
  4. D
    argentite and cuprite are oxides                            
Question 25Single Answer
The oxidation number of chlorine in HClO4 is :
  1. A
    +7                                              
  2. B
    +5
  3. C
    +3                                                
  4. D
    -1      
Question 26Single Answer
Nitrous acid reacts with H2SO4 to give :
  1. A
    NO + SO3                                    
  2. B
    NO2 + SO2
  3. C
    NO + SO2                                     
  4. D
    None of these
Question 27Single Answer
Pyrolusite is an ore of :
  1. A
    polonium                                    
  2. B
    manganese
  3. C
    tin                                                 
  4. D
    lead  
Question 28Single Answer
Turnbull’s blue is a compound :
  1. A
    ferri cyanide                            
  2. B
    ferrous ferri cyanide    
  3. C
    ferrous cyanide                        
  4. D
    ferri ferro cyanide     
Question 29Single Answer
What is the composition of tear gas?
  1. A
    KCl MgCl2 24H2O                        
  2. B
    Na2S2O3 - nH2O
  3. C
    Cl3CNO2                                       
  4. D
    K4Fe (CN)6       
Question 30Single Answer
Halogen having greatest electron affinity :
  1. A
    F                                                   
  2. B
    Cl
  3. C
    Br                                                
  4. D
    I         
Question 31Single Answer
Bragg’s law is given by the equation :
  1. A
                 
  2. B
  3. C
                      
  4. D
         
Question 32Single Answer
For a reaction to occur spontaneously :
  1. A
    must be negative
  2. B
    must be positive
  3. C
    must be negative
  4. D
    ∆H must be negative     
Question 33Single Answer
Consider the equilibrium : The maximum yield of ammonia is obtained by :
  1. A
    Decrease of temp and increase of pressure            
  2. B
    Inecrease of temp and decrease of pressure       
  3. C
    Decrease of both the temp and pressure
  4. D
    Inecrease of temp and pressure                              
Question 34Single Answer
A solid is formed from atom A and B and crystallizes into a face centred cubic lattice with A at the face centred position and B at the corners of the cube. Its molecular formula is represented by :
  1. A
    AB3                                            
  2. B
    A3B
  3. C
    AB2                                            
  4. D
    A2B   
Question 35Single Answer
Which is not deflected by magnetic field ?
  1. A
    Proton                                        
  2. B
    Neutron
  3. C
    Electron                                     
  4. D
    Positron           
Question 36Single Answer
Which of the following pairs are correctly matched ?
  1. A
    Isoelectronics N3-, O2-, Cr3-
  2. B
    Isotones 14Si30, 15P31, 16S32
  3. C
    Isotopes 20Ca40, 19K40
  4. D
    Isobars 80O16, 80O17, 8O18
Question 37Single Answer
The weight of 11.2 L of CO2 at STP would be :
  1. A
    22 g                                            
  2. B
    32 g
  3. C
    44 g                                         
  4. D
    88 g                  
Question 38Single Answer
Addition of conc. HCl to saturated BaCl2 solution precipitates BaCl2; because :
  1. A
    at constant temperature, the product [Ba2+] [Cl-]2 remains constant in a saturated solution
  2. B
    ionic product [Ba2+] [Cl-] remains constant in a saturated collection
  3. C
    the ionic product [Ba2+][Cl-]2 is greater than solubility product
  4. D
    it follows from Le-Chatelier’s principle      
Question 39Single Answer
Which of the following will occur if a 0.1 M solution of a weak acid is diluted to 0.01 M at constant temperature ?
  1. A
    Ka will increase
  2. B
    pH will decrease
  3. C
    Percent ionisation increase
  4. D
    [H+] will decrease to 0.01 M        
Question 40Single Answer
In the equilibrium AB(s) ⇌ A+ B, If the equilibrium concentration of A is doubled, the equilibrium concentration of B would become :
  1. A
    Twice                                    
  2. B
    Half 
  3. C
    1/4                                          
  4. D
    1/8
Question 41Single Answer
The freezing points of equimolar solutions of glucose, KNO3 and AlCl3 are in the order of :
  1. A
    AlCl3 < glucose < KNO3
  2. B
    AlCl3 < KNO3 < glucose
  3. C
    glucose < KNO3 < AlCl3
  4. D
    glucose < AlCl3 < KNO3
Question 42Single Answer
What will be the molarity of a solution containing 5.0 g of NaOH in 250 mL solution ?
  1. A
    0.1 g                                           
  2. B
    0.5
  3. C
    1.0                                             
  4. D
    2.0                    
Question 43Single Answer
Which one of the following is the correct decreasing order of boiling point ? 
  1. A
    H2Te > H2O > H2Se > H2S
  2. B
    H2O > H2S > H2Se> H2Te
  3. C
    H2Te > H2Se > H2S > H2O
  4. D
    H2O > H2Te > H2Se > H2S             
Question 44Single Answer
van der Waals’ forces are applied to :
  1. A
    elementary gases only
  2. B
    mixture of gases
  3. C
    inert gases only
  4. D
    rare gases only
Question 45Single Answer
Among the following the most highly ionised in water is :
  1. A
    CH2(Cl)CH2CH2COOH
  2. B
    CH3CH2CCl2COOH
  3. C
    CH3CH(Cl)CH2COOH
  4. D
    CH3CH2CH(Cl)COOH       
Question 46Single Answer
Sanger's reagent is used for the identification of:
  1. A
    N-thermal of peptide chain
  2. B
    C-thermal of peptide chain
  3. C
    Side chian of amino acids 
  4. D
    number of amino acids in peptide chain
Question 47Single Answer
Geometrical isomerism is shown by :
  1. A
  2. B
  3. C
  4. D
Question 48Single Answer
Acetophenone is prepared from 
  1. A
    Rosenmund  Reaction
  2. B
    Sandmayer reaction 
  3. C
    Wurtz reaction
  4. D
    Freiedel craft reaction
Question 49Single Answer
The energy of hydrogen atom in its ground state is – 13.6 eV. The energy of the level corresponding to the quantum number n = 5 is
  1. A
    – 5.40 eV
  2. B
    – 0.54 eV
  3. C
    – 2.72 eV
  4. D
    – 0.85 eV
Question 50Single Answer
Which of the following species is diamagnetic?
  1. A
    O2
  2. B
    O22–
  3. C
    O2-
  4. D
    O2+
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