Question

Which of the following statements is NOT true about solubility?

• A. The solubility of gases in water usually decreases with increase of temperature.
• B. The solubility of gases in water usually increases with increase in pressure.
• C. The substances having similar inter-molecular forces are likely to be soluble in each other.
• D. Gases like \(\text{NH}_3\) and \(\text{CO}_2\) obey Henry's law

Hint:

Gases that react with water, such as NH3 and CO2, do not obey Henry's law.

Answer 1

The Correct Option is D

Step 1: Plan:
Test each statement against known solubility rules.

Step 2: Verdict:
The first three are standard facts: gas solubility falls on heating, rises with pressure, and follows 'like dissolves like'. The fourth is false because Henry's law holds only for gases that do not react with the solvent. Ammonia and carbon dioxide both react with water, so they are exceptions.

Final Answer:
The statement that is NOT true is option (D). \[ \boxed{\text{(D)}} \]