JEE Main · 2019 · Shift-IIeasyCEQ-009

In which one of the following equilibria, KP KC?

Chemical Equilibrium · Class 11 · JEE Main Previous Year Question

Question

In which one of the following equilibria, KP≠KCK_P \neq K_C?

Options
  1. a

    2HI(g)⇌H2(g)+I2(g)\mathrm{2HI(g) \rightleftharpoons H_2(g) + I_2(g)}

  2. b

    2C(s)+O2(g)⇌2CO(g)\mathrm{2C(s) + O_2(g) \rightleftharpoons 2CO(g)}

    ✓
  3. c

    2NO(g)⇌N2(g)+O2(g)\mathrm{2NO(g) \rightleftharpoons N_2(g) + O_2(g)}

  4. d

    NO2(g)+SO2(g)⇌NO(g)+SO3(g)\mathrm{NO_2(g) + SO_2(g) \rightleftharpoons NO(g) + SO_3(g)}

Correct Answerb

2C(s)+O2(g)⇌2CO(g)\mathrm{2C(s) + O_2(g) \rightleftharpoons 2CO(g)}

Detailed Solution

Condition: KP≠KCK_P \neq K_C when Δng≠0\Delta n_g \neq 0

Step 1 — Calculate Δng\Delta n_g for each:

(1) 2HI⇌H2+I22\mathrm{HI} \rightleftharpoons \mathrm{H_2 + I_2}: Δng=2−2=0⇒KP=KC\Delta n_g = 2 - 2 = 0 \Rightarrow K_P = K_C ✗

(2) 2C(s)+O2(g)⇌2CO(g)2\mathrm{C(s) + O_2(g)} \rightleftharpoons 2\mathrm{CO(g)}: Only gases count. Δng=2−1=1≠0⇒KP≠KC\Delta n_g = 2 - 1 = 1 \neq 0 \Rightarrow K_P \neq K_C ✓

(3) 2NO⇌N2+O22\mathrm{NO} \rightleftharpoons \mathrm{N_2 + O_2}: Δng=2−2=0⇒KP=KC\Delta n_g = 2 - 2 = 0 \Rightarrow K_P = K_C ✗

(4) NO2+SO2⇌NO+SO3\mathrm{NO_2 + SO_2} \rightleftharpoons \mathrm{NO + SO_3}: Δng=2−2=0⇒KP=KC\Delta n_g = 2 - 2 = 0 \Rightarrow K_P = K_C ✗

Answer: Option (2)

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In which one of the following equilibria, KP KC? (JEE Main 2019) | Canvas Classes