Multiple Choice Objective Chemistry Question

Objective Chemistry for Entrance Exam

1. 
   

   
   

2.  The symbol for SI unit  kg m-1 s-2 is ?
   

1. A. J     
2. B. N      
3. C. Pa        Correct Answer
4. D. C      

3.  

   
   

   Which one of the following is the base physical quantity?

1. A. Electric Charge     
2. B. Electric Current        Correct Answer
3. C. Electric Field      
4. D. Electric Resistance      

4.  

   
   

   Which of the following unit does not represent the Joule Unit?

1. A. kg m2 s-2     
2. B. N m      
3. C. Pa m-3        Correct Answer
4. D. C V      

5.  

   
   

   The Value of Avogardo Constant is ?

1. A. 6.022 x 1022     
2. B. 6.022 x 1023 atoms      
3. C. 6.022 x 1023  mols-1      
4. D. 6.022 x 1022  mols-1      

6.  

   
   

   Which of the following conversion units is correct?

1. A. 1 Pa = 1 kg m s-2     
2. B. 1 J = 1 kg m2 s-2        Correct Answer
3. C. 1 C = 1 A s-1      
4. D. 1 N = 1 kg m-1 s2      

7.  

   
   

   The prefix for the multiple of 1018 is?

1. A. Tera     
2. B. Peta      
3. C. Exa      
4. D. Atto        Correct Answer

8.  

   
   

   The prefix for the fraction 10-15  is ?

1. A. Nano     
2. B. Picco      
3. C. Femto        Correct Answer
4. D. Giga      

9.  

   
   

   One gigameter stands for 

1. A. 106     
2. B. 109 m        Correct Answer
3. C. 1012 m      
4. D. 1015 m      

10.  

    
    

    The Significant digits in the number 0.300 are

1. A. 1     
2. B. 2      
3. C. 3        Correct Answer
4. D. 4      

11.  

    
    

    The Radius of a hydrogen atom is 5.29 x 10-11 m and that of proton is 1.5 x 10-15 m. The ratio of the radius of atom to the radius of proton in the significant notation will be

1. A. 3.526 x 104      
2. B. 35.266 x 103       
3. C. 3.5 x 104         Correct Answer
4. D. 3.5266667 x 103       

12.  

    
    

    If Π (Pie) = 3.14159, then the value of 4 Π (0.0125) in the scientific notation will be 

1. A. 0.001964     
2. B. 1.96 x 10-3        Correct Answer
3. C. 1.9635 x 10-3      
4. D. 3.5266667 x 10-2      

13.  

    
    

    The number of significant digits in the number 126000 is

1. A. 3       Correct Answer
2. B. 4      
3. C. 5      
4. D. 6      

14.  

    
    

    The unified atomic mass unit has value of

1. A. 1.661 x 10-27 g     
2. B. 1.661 x 10-27 kg        Correct Answer
3. C. 1.661 x 10-25 g      
4. D. 1.661 x 10-25 kg      

15.  

    
    

    The relative atomic mass of sodium is 23. Which of the following statement is not Correct about Sodium?

1. A. Atomic Mass of Sodium is 23 u.     
2. B. Atomic Mass of Sodium is 3.82 x 10-26 kg.      
3. C. Molar Mass of Sodium is 23 g mol-1      
4. D. The number of atom in 24 kg of sodium is 6.022 x 10-23        Correct Answer





16. 
    

    Chlorine Exist as  35Cl (atomic Mass = 34.9688 u; 75.77%) and   37Cl  (atomic Mass = 36.9659 u; 24.23 %). The atomic mass of the natural existing Chlorine is 

1. A. 35.452 7 u       Correct Answer
2. B. 36.423 6 u      
3. C. 34.123 5 u      
4. D. 32.345 8 u      

17.  

    
    

    3.9 g of an organic compound on combutions gives 13.2 g of CO2 and 2.7 g of H2O. The empirical formula of the compound is ?

1. A. CH       Correct Answer
2. B. CH2      
3. C. C2H4      
4. D. C6H6      

18.  

    
    

    Which one of the following has maximum number of atoms?

1. A. 16 g of C     
2. B. 20 g of Na      
3. C. 45 g of S         Correct Answer
4. D. 15 g of N      

19.  

    
    

    An organic compound contains 20.0% C, 6.66% H, 47.33% N and rest was Oxygen. Its molar mass is 60 g mol -1 . The moleculer formula of the compound is 

1. A. CH4 N2O       Correct Answer
2. B. CH2 NO      
3. C. C2 H6 NO      
4. D. CH18 NO      

20.  

    
    

    Mass percentage of Na in Na2CO3  is

1. A. 21.52%     
2. B. 31.20%      
3. C. 38.20%      
4. D. 43.40%        Correct Answer

21.  

    
    

    If and Iron oxide has a 69.9 mass% of Fe ( Molar mass = 56.0 g / mol ) and 30.1 mass% of Oxygen, Its Moleculer Formula will be

1. A. FeO     
2. B. Fe2O3        Correct Answer
3. C. Fe3O4      
4. D. Fe2O6      

22.  

    
    

    The number of Oxygen atoms in 24.9 g of CuSO4.5H2O is ( molar mass of Cu=63 g/mol )

1. A. 2.41 x 1024     
2. B. 3.01 x 1024      
3. C. 5.42 x 1023        Correct Answer
4. D. 5.42 x 1024      

23.  

    
    

    A compound contains 11.99% N, 13.70% O, 9.25% B and 65.06% F. Its emperical formula is ( molar mass of B is 10.8 g / mol)

1. A. NOBF2     
2. B. NOBF4        Correct Answer
3. C. N2OF2      
4. D. NO2F2      

24.  

    
    

    Law of Conservation of masses was firstly established by

1. A. Lavoisier       Correct Answer
2. B. Proust      
3. C. Dalton      
4. D. Gay Lussac      

25.  

    
    

    For the reaction      2A (g)    +    3 B (g)    →  4 C (g)    +  5D  (g)

    
    

                           n°    1.5 mol           2.0 mol

    
    

    The amounts of A, B, C and D when the reaction has proceeded to the extent  = 0.15 mol, respectively, are 

1. A. 1.0 mol, 1.25 mol, 1.0 mol and 1.25 mol     
2. B. 1.2 mol, 1.55 mol, 0.60 mol and  .75 mol        Correct Answer
3. C. 0.5 mol, 0.5 mol, 2.0 mol and 2.5 mol      
4. D. 0.9 mol, 1.1 mol, 1.2 mol and 1.5 mol      

26.  

    
    

    Consider the reaction     N2 (g)       +       3H2 (g)     →    2 NH3 (g)

    
    

                             n0             1.5 mol                 1.5 mol

    
    

    with the progress of reactions it is found that there is formation of 0.8 mol of NH3. At this stage , the extent of reaction is 

1. A. 0.2 mol     
2. B. 0.3 mol      
3. C. 0.4 mol        Correct Answer
4. D. 0.5 mol      

27.  

    
    

    In the reaction N2H4 + 3O2 → 2NO2 + 2H2 the mass of Oxygen required to combine with 745 g of N2H4  will be ?

1. A. 2120 g     
2. B. 2235 g        Correct Answer
3. C. 2436 g      
4. D. 2510 g      

28.  

    
    

    The number of atoms in 0.05 g of water is

1. A. 1.67 x 1023     
2. B. 1.67 x 1022      
3. C. 5.02 x 1021        Correct Answer
4. D. 1.67 x 1021      
5.