Stoichiometry MCQ Questions & Answers | Chemical Engineering

The pH scale measures the acidity or alkalinity of a solution, ranging from 0 (most acidic) to 14 (most alkaline), with 7 being neutral.

A solution with pH 2 (A₁) is strongly acidic, since it is much lower than 7.

A solution with pH 6 (A₂) is slightly acidic, as it is just below neutral.

Therefore, A₁ is highly acidic compared to A₂.

Option A is incorrect because A₁ is not alkaline at all, and Option C is incorrect because pH 2 indicates strong acidity, not slight acidity.

Hence, the correct interpretation is that A₁ is highly acidic.

According to the ideal gas law, for a fixed amount of gas:

PV = nRT

Since the amount of gas (n) and gas constant (R) stay constant, the relationship between volume, temperature, and pressure is:

V ∝ T/P

You are doubling the absolute temperature (T₂ = 2T₁), and at the same time reducing the pressure to half (P₂ = 0.5P₁).

So, the new volume compared to the original volume will be:

V₂/V₁ = (T₂/T₁) * (P₁/P₂)

Substituting the values gives:

V₂/V₁ = (2T₁/T₁) * (P₁/0.5P₁)

V₂/V₁ = 2 * 2 = 4

Therefore, the volume of the gas will experience a four fold increase, not just doubling.