Chemistry Mcqs Set 58

Chemistry Mcqs Set 58

1. 1 cc of N2O at STP contains ..................
(i) x 10^22 atoms            
(ii) x 10^23 molecules         
(iii) x 10^23 electrons            
(iv) all the above
 
2. One mole of the oxygen gas has the volume of ........................
(i) 1 L of oxygen a STP                            
(ii) 32 L of oxygen a STP
(iii) 22.4 L of oxygen a STP    
(iv) 6.02 x 1023 molecules of oxygen at any temperature and pressure
 
3. How many moles are represented by 36g of water?
(i) 1                    
(ii) 2                      
(iii) 3                          
(iv) 4
 
4. What is the mass of 4.48 x 10^-2m3 of Methane gas at STP?
(i) 16 g                      
(ii) 32 g                      
(iii) 48 g                      
(iv) 54 g
 
5. Gram molecular mass of nitrogen is ....................
(i) 23                        
(ii) 14                         
(iii) 7                         
(iv) none
 
6. The number of molecules present in 17 g of ammonia is ................
(i) 6.023 x 10^23                    
(ii) 6.023                
(iii) 60.23 x 10^23               
(iv) 6.023 x 10^22
 
7. The gram-atomic mass of chlorine is ......................
(i) 35.5 g                    
(ii) 35.5 kg                        
(iii) 3.55 g                         
(iv) 3.55 kg
 
8. 4.25 g of ammonia is equal to ....................
(i) 0.25 mole                
(ii) 1 mole                     
(iii) 1.5 mole                      
(iv) 0.5 mole
 
9. How many molecules are present in one gram of hydrogen?
(i) 6.023 x 10^22               
(ii) 6.023 x 10^23               
(iii) 3.015 x 10^23             
(iv) 3.015 x 10^-12 

10. The weight of one calcium atom ( at mass=40) is ........................
(i) 40 g               
(ii) 6.02 x 10^-23g                 
(iii) 6.64 x 10^-23g            
(iv) 6.02 x 10^23g