Some Basic Concepts of Chemistry Quiz-01

1. Dissolving 120 g of urea (mol.wt.60) in 1000 g of water gave a solution of density 1.15 g/mL. The molarity of the solution is

 
 
 
 

2. The ratio mass of oxygen and nitrogen of a particular gaseous mixture is 1:4. The ratio of number of their molecule is

 
 
 
 

3. The most abundant elements by mass in the body of a healthy human adult are Oxygen(61.4%); Carbon(22.9%), Hydrogen(10.0%); and Nitrogen(2.6%). The weight which a 75 kg person would gain if all ¹H atoms are replaced by ²H atoms is

 
 
 
 

4. Which has maximum number of atoms?

 
 
 
 

5. The molarity of a solution obtained by mixing 750 mL of 0.5 M HCl with 250 mL of 2 M HCl will be

 
 
 
 

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