For which of the following reactions is the ratio kp/kc largest at 300 k?

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For which of the following reactions is the ratio kp/kc largest at 300 k?

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Below are the options:

A. Ni (CO) 4 (g) ⇌ Ni (í) + 4CO (g)
B. C (s) + 2H2 (g) ⇌ CH4 (g)
C. CaCO3 (s) ⇌ CaO (s) + CO2 (g)
D. N2 (g) + O2 (g) ⇌ 2 NO (g)

The answer is A. Ni (CO) 4 (g) ⇌ Ni (s) + 4CO (g)

The Kp / Kc ratio is equal to (RT) Δn. K is constant and the temperature is kept constant. Therefore, the Kp / Kc ratio depends on Δn or mole difference of gaseous product and reagent. The reaction with the largest Kp / Kc ratio is Ni (CO) 4 (g) ⇌ Ni (s) + 4CO (g) with Δn of 3.