Question

Which of the following represents Gay Lussac's law? I. (P)/(T) = constant II. P₁T₂ = P₂T₁ III. P₁V₁ = P₂V₂ Choose the correct option.

• A. I, II and III
• B. II and III
• C. I and III
• D. I and II

Hint:

Gay Lussac’s law: P ∝ T at constant volume.

Answer 1

The Correct Option is D

Step 1: Gay Lussac’s law (pressure law) states: (P)/(T) = constant (at constant volume) Step 2: From this: (P₁)/(T₁) = (P₂)/(T₂) ⟹ P₁T₂ = P₂T₁ Step 3: P₁V₁=P₂V₂ is Boyle’s law, not Gay Lussac’s law. Hence, statements I and II are correct.