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  • Complete JEE Main/Advanced Course and Test Series
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The Reaction Quotient “Q”

Consider the equilibrium

aA +bB 39_equal.JPGcC +dD

At equilibrium 

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

When the reaction is not at equilibrium this ratio is called ‘QC’ i.e., QC is the general term used for the above given ratio at any instant of time. And at equilibrium QC becomes KC.

  • If the reaction is at equilibrium, Q = Kc

  • A net reaction proceeds from left to right (forward direction) if Q < KC.

  • A net reaction proceeds from right to left (the reverse direction) if Q >Kc

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