The average atomic mass of chlorine using the following data would be:

Isotope	% Natural Abundance	Molar Mass
35Cl	75.77	34.9689
37Cl	24.23	36.9659

1. 38.4527 u

2. 37.4527 u

3. 36.4527 u

4. 35.4527 u

The number of moles of hydrogen atoms present in 3 moles of ethane (C₂H₆), will be-

1. 18.069 × 10²³

2. 1.8 × 10²³

3. 18

4. 6 × 10²³

20 g of sugar is dissolved in enough water to make a final volume of 2L. The concentration of sugar (C₁₂H₂₂O₁₁) in mol L^–1  will be:

1. 0.29 mol/L

2. 0.029 mol/L

3. 0.35 mol/L

4. 0.032 mol/L

How much volume of methanol is needed to prepare 2.5 L of a 0.25 M solution, if the density of methanol is 0.793 kg/L?

1. 22.25 mL
2. 24.78 mL
3. 25.22 mL 
4. 28.52 mL

If the mass of air per unit area at sea level is 1034 g cm^–2, pressure in pascal will be:

1. 1.01332 × 10⁵ Pa

2. 1.01332 × 10⁶ Pa

3. 1.01332 × 10⁷ Pa

4. 1.01332 × 10⁸ Pa

The SI unit of mass is:

1. Kilogram (kg)

2. Gram (g)

3. Pascal (Pa)

4. Kilometres (km)

A significant figure is defined as :

The chloroform contamination level in water is 15 ppm (by mass of chloroform). The molality of chloroform in the water sample would be:

1. 3.25 × 10^-4   

2. 1.5 × 10^-3 

3.  7.5 × 10^-3    

4. 1.25 × 10^-4  

If the speed of light is 3.0 × 10⁸ m s^–1, then the distance covered by light in 2.00 nanoseconds will be -

1. 0.500 m

2. 0.600 m

3. 0.700 m

4. 0.800 m

In a reaction A + B₂ → AB_2, 
A will act as a limiting reagent if :

 
Choose the correct option: