Some Basic Concepts of Chemistry

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Multiple Choice Questions

1. Mark the rule which is not correctly stated about the determination of significant figures.

 
 
 
 

2. The reference standard used for defining atomic mass is

 
 
 
 

3. What will be the standard molar volume of He, if its density is 0.1784 g/L at STP?

 
 
 
 

4. If 500 mL of a 5 M solution is diluted to 1500 mL, what will be the molarity of the solution obtained?

 
 
 
 

5. With the increase in temperature, which of these changes?

 
 
 
 

6. Which of the following statements indicates that the law of multiple proportions is being followed?

 
 
 
 

7. A mixture of gases contains H and O2 gases in the ratio of 1: 4 (w/w). What is the molar ratio of the two gases in the mixture?

H2   O2

 
 
 
 

8. The percentage weight of Zn in white vitriol [ ZnSO4.7H2O] is approximately equal to (Zn = 65,S = 32,O = 16 and H = 1).

 
 
 
 

9. One mole of any substance contains \(6.022 × 10^{23} \)atoms/molecules. The number of molecules of \(H_2SO_4\) present in 100 mL of 0.02 M \(H_2SO_4 \)solution is……..

 
 
 
 

10. In order to prepare a one-litre normal solution of KMnO4, how many grams of \( KMnO_4 \) is required if the solution is to be used in the acid medium for oxidation?

 
 
 
 


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