Chemistry Mcqs Set 57

 Chemistry Mcqs Set 57

1. Which of the following pairs constitute an elementary molecule?
(i) hydrogen and chlorine                     
(ii) water and nitric oxide
(iii) methane and water                         
(iv) Hydrogen and water
 
2. Identify the pair which consists of a homoatomic molecule and a hetero atomic molecule ................
1. nitrogen and ammonia                    
2. nitrogen and oxygen 
3. oxygen and water                             
4. chlorine and nitrogen
(i) 1 and 2                
(ii) 1 and 3                     
(iii) 3 and 4                      
(iv) 1 and 4
 
3. The number of atoms present in one gram of hydrogen atom is .....................
(i) 1                  
(ii) 6.023 x 10^23               
(iii) 2 x 6.023 x 10^23             
(iv) 3.06 x 10^23
 
4. Which of the following is correct with respect to a mole of substance?
(i) 1 mole = 6.023 x 10^23 molecules              
(ii) 1 mole = atomicity x 6.023 x 10^23 atoms
(iii) 1 mole = atomicity x 1 gram atom                        
(iv) all the above
 
5. The number of molecules in 32 g of oxygen is ...............................
(i) 3.01 x 10^23                 
(ii) 6.023 x 10^23               
(iii) 3.01 x 10^32                 
(iv) 2 x 6.023 x 10^23
 
6. The mass of one molecule of nitrogen is ......................
(i) 28 g                     
(ii) 0.28 g                      
(iii) 28/(6.023x10^23) g                 
(iv) g
 
7. Which of the following has highest mass in grams?
(i) 1 atom of silver                
(ii) 1 mol of nitrogen          
(iii) 1 mol of calcium      
(iv) 2 g of sodium
 
8. One mol of carbon-dioxide contains ..........................
(i) 6.023 x 10^23 molecules of carbon-dioxide                   
(ii) 6.023 x 10^23 atoms of oxygen
(iii) 18.1 x 10^23 molecules of carbon-dioxide                     
(iv) 3 gm of carbon-dioxide
 
9. Which among the following will contain the same number of atoms of oxygen and other element in one mole of that substance .......................
1. carbon monoxide            
2. nitrous oxide           
3. nitrogen dioxide          
4. carbon-dioxide
(i) 1 and 2               
(ii) 3 and 4                   
(iii) 1 and 3                     
(iv) 2 and 4
 
10. The volume occupied by 2 mol of nitrogen dioxide at STP is ..................
(i) 22.41                   
(ii) 44.821                
(iii) 2.2421                        
(iv) 4.4821