1. 2HI ⇋ H₂ + I₂
  2. N₂O₄ ⇋ 2NO₂
  3. 2SO₂ + O₂ ⇋ 2SO₃
  4. None of these
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Answer: Option 2

Since $${K_p} = {K_c}R{T^{\Delta n}}$$   out of the given reactions the reaction $${N_2}{O_4} \Leftrightarrow 2N{O_2}$$    has $$\Delta n > 0 \Rightarrow {K_p} = {K_c}.$$

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