1. ⇒ (MHT CET 2023 12th May Evening Shift )

What is the solubility of gas in water at $25^{\circ} C$ if partial pressure is 0.346 bar [Henry's law constant is $[0.159 mol {dm}^{- 3} {bar}^{- 1}]$ ?

A. $0.055 mol {dm}^{- 3}$

B. $0.028 mol {dm}^{- 3}$

C. $0.083 mol {dm}^{- 3}$

D. $0.11 mol {dm}^{- 3}$

Correct Option is (A)

$\begin{aligned} S = K_{H} P & = 0.159 mol {dm}^{- 3} {bar}^{- 1} \times 0.346 bar \\ = 0.055 mol {dm}^{- 3} \end{aligned}$

2. ⇒ (MHT CET 2023 11th May Morning Shift )

Which among following salts shows decrease in solubility with increase in temperature?

A. ${Na}_{2} {SO}_{4}$

B. ${KNO}_{3}$

C. ${NaNO}_{3}$

D. $KBr$

Correct Option is (A)

Dissolution of ${Na}_{2} {SO}_{4}$ in water is an exothermic process. When a substance dissolves in water by an exothermic process, its solubility decreases with an increase in temperature. Hence, solubility of ${Na}_{2} {SO}_{4}$ in water decreases with increase in temperature.

3. ⇒ (MHT CET 2023 10th May Evening Shift )

The solubility of a gas in a liquid is directly proportional to the pressure of the gas over the solution. Identify the law for this statement.

A. Henry's law

B. Raoult's law

C. Dalton's law

D. Avogadro's law

Correct Option is (A)

Currently no explanation available

4. ⇒ (MHT CET 2023 10th May Evening Shift )

What is the solubility of a gas in water at $25^{\circ} C$ if partial pressure is $0.18 atm$ ?

$(K_{H} = 0.16 mol {dm}^{- 3} {atm}^{- 1})$

A. $0.029 mol {dm}^{- 3}$

B. $0.022 mol {dm}^{- 3}$

C. $0.032 mol {dm}^{- 3}$

D. $0.038 mol {dm}^{- 3}$

Correct Option is (A)

$\begin{aligned} S & = K_{H} \times P \\ = 0.16 \times 0.18 \\ = 0.0288 mol {dm}^{- 3} \end{aligned}$

5. ⇒ (MHT CET 2023 9th May Evening Shift )

Which among the following gases exhibits very low solubility in water at room temperature?

A. $O_{2}$

B. ${CO}_{2}$

C. ${NH}_{3}$

D. $HCl$

Correct Option is (A)

Option A, $O_{2}$ (Oxygen), is the gas that exhibits very low solubility in water at room temperature among the options provided.

Oxygen is a non-polar molecule and has a very low solubility in water, which is a polar solvent. This low solubility is due to the lack of strong interactions between the oxygen molecules and the water molecules.

Regarding the other options :

${CO}_{2}$ (Carbon Dioxide) is more soluble than oxygen due to its ability to react with water to form carbonic acid.

${NH}_{3}$ (Ammonia) is highly soluble in water and forms ammonium hydroxide.

$HCl$ (Hydrochloric Acid) is extremely soluble in water and dissociates completely to form hydrochloric acid.

⇒Solution