Which law is applied when deep-sea divers use a breathing mixture of oxygen and less soluble helium to minimise the painful effects caused by the increased dissolution of gases in blood at high pressure?

On dissolving sugar in water at room temperature solution feels cool to touch. Dissolution of sugar will be most rapid under the following conditions:

1. Sugar crystals in cold water
2. Sugar crystals in hot water
3. Powdered sugar in cold water
4. Powdered sugar in hot water

The mole fraction of glucose (C₆H₁₂O₆) in an aqueous binary solution is 0.1. The mass percentage of water in it to the nearest integer is:

The value of Henry's law constant:

A 40% (w/V) NaCl solution (density = 1.14 g/ml) is equivalent to: 

1. $0.35\times {10}^5<mspace\; width="1em"></mspace>ppm$
2. $4\times {10}^6<mspace\; width="1em"></mspace>ppm$
3. $3.5\times {10}^6<mspace\; width="1em"></mspace>ppm$
4. $0.35\times {10}^6<mspace\; width="1em"></mspace>ppm$

Henry’s law constant for the solution of methane in benzene at 298 K is 4.27 × 10⁵ mm Hg. The mole fraction of methane in benzene at 298 K under 760 mm Hg will be:

1. 1.85 × 10^–5

2. 192 × 10^–4

3. 178 × 10^–5

4. 18.7 × 10^–5