# Kc for m1A + m2B = n1C + n2D is given by: Option 1) Kc = $\frac{[A]^{m_{1}}[B]^{m_{2}}}{[C]\times [D]}$ Option 2) Kc = $\frac{[A]^{m_{1}}[B]^{m_{2}}}{[C^{m_{1}}]\times [D]^{m_{2}}}$ Option 3) Kc = $\frac{[C]^{n_{1}}[D]^{n_{2}}}{[A]^{m_{1}}\times [B]^{m_{2}}}$ Option 4) Kc = $\frac{[C]^{n_{1}}[D]^{n_{2}}}{[A]^{n_{1}}\times [B]^{n_{2}}}$

As we learnt in

Law of Chemical equilibrium -

At a given temperature, the product of concentration of the reaction products raised to the respective stoichiometric coefficient in the balanced chemical equation divided by the product of concentration of the reactants raised to their individual stoichiometric coefficients has a constant value.

- wherein

$aA+bB\rightleftharpoons cC+dD$

$K_{c}=\frac{[C]^{c\:[D]^{d}}}{[A]^{a}\:[B]^{b}}$

$[A],\:[B],\:[C]\:[D]$

are equilibrium concentration

m1A + m2B = n1C + n2

$K_{c}=\frac{[C]^{n_1}\:[D]^{n_2}}{[A]^{m_1}\:[B]^{m_2}}$

Option 1)

Kc = $\frac{[A]^{m_{1}}[B]^{m_{2}}}{[C]\times [D]}$

Incorrect

Option 2)

Kc = $\frac{[A]^{m_{1}}[B]^{m_{2}}}{[C^{m_{1}}]\times [D]^{m_{2}}}$

Incorrect

Option 3)

Kc = $\frac{[C]^{n_{1}}[D]^{n_{2}}}{[A]^{m_{1}}\times [B]^{m_{2}}}$

correct

Option 4)

Kc = $\frac{[C]^{n_{1}}[D]^{n_{2}}}{[A]^{n_{1}}\times [B]^{n_{2}}}$

Incorrect

3

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