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Law of Mass Action

For which of ...

Question

For which of the following reactions, $K_{P} = K_{C}$ ?

A

P C l_{3} (g) + C l_{2} (g) ⇋ P C l_{5} (g)

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B

H_{2} (g) + C l_{2} (g) ⇋ 2 H C l (g)

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C

N_{2} (g) + 3 H_{2} (g) ⇋ 2 N H_{3} (g)

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D

C a C O_{3} (s) + ⇋ C a O (s) + C O_{2} (g)

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Solution

The correct option is B $H_{2} (g) + C l_{2} (g) ⇋ 2 H C l (g)$
$K_{P} = K_{C} (R T)^{Δ n_{g}}$
if $Δ n_{g} = 0, K_{P} = K_{C}$
$Δ n_{g}$ is the number of moles of gaseous products - number of moles of gaseous reactants in a balanced equation.
for reaction in (b) $Δ n_{g} = 0$
so, for (b), $K_{P} = K_{C}$

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Law of Mass Action

Standard XII Chemistry

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