In sodium sulphate (Na₂SO₄), the mass percent of sodium, sulfur and oxygen is:

1. 32.4%, 45.05%, 22.6%

2. 22.6%, 45.05%, 32.4%

3. 32.4%, 22.6%, 45.05%

4. 45.05%, 32.4%, 22.6%

The amount of ${\mathrm{CO}}_2$ that can be produced when 2 moles of carbon are burnt in 16 g of dioxygen is:
1. 22 g
2. 44 g
3. 0.5 g
4. 11 g

The amount of copper (in grams) that can be obtained from 100 g of copper sulphate (CuSO₄) is:

1. Fe₃O₂

2. Fe₂O₂

3. Fe₂O₃

4. Fe₃O₄

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

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)