For a hypothetical reaction
$4 A + 5 B ⇋ 4 P + 6 Q,$
The equilibrium constant $K_{c}$ has units

m o l L^{- 1}

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m o l^{- 1} L

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(m o l L^{- 1})^{- 2}

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unit less

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Solution

The correct option is A $m o l L^{- 1}$
$K_{c} = [P]^{4} [Q]^{6} / ([A]^{4} [B]^{5}) = (m o l L^{- 1})^{10} / (m o l L^{- 1})^{9} / = m o l L^{- 1}$

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