In which of the following reaction standard entropy change (ΔS⁰)

In Which Of The Following Reaction Standard Entropy Change S Chemistry Question

In which of the following reaction standard entropy change (ΔS⁰) is positive and standard Gibb’s energy change (ΔG⁰) decreases sharply with increasing temperature

Options

(a) C (graphite) + 1/2 O₂(g) → CO(g)
(b) CO(g) + 1/2 O₂(g) → CO₂(g)
(c) Mg(s) + 1/2 O₂(g) → MgO(s)
(d) 1/2 C(graphite) + 1/2 O₂(g) → 1/2 CO₂(g)

Correct Answer:

C (graphite) + 1/2 O₂(g) → CO(g)

Explanation:

C(graphite) + 1/2 O₂(g) → CO(g),
Δn(g) = 1 – 1/2 = 1/2,
As amount of gaseous substance is increasing in product, thus
ΔS is positive for this reaction. And we know that ΔG = ΔH -TΔS. As ΔS is positive, thus increase in temperature will make TΔS more negative and ΔG will decrease.

Related Questions:

  1. A buffer solution contains 0.1 M of acetic acid and 0.1 M of sodium acetate.
  2. Number of isomers of C₄H₁₀ is
  3. When ethyl chloride and alcoholic KOH are heated, the compound obtained is
  4. Which of the following sets of quantum numbers violates the rules of quantum mechanics
  5. The equivalent mass of Fe in FeO is

Topics: Thermodynamics (179)
Subject: Chemistry (2512)

Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score

18000+ students are using NEETLab to improve their score. What about you?

Solve Previous Year MCQs, Mock Tests, Topicwise Practice Tests, Identify Weak Topics, Formula Flash cards and much more is available in NEETLab Android App to improve your NEET score.

NEETLab Mobile App

Share this page with your friends

Be the first to comment

Leave a Reply

Your email address will not be published.


*