# Equilibrium Quotient (Qc), Predicting the direction of reaction

## Remember concepts with our Masterclasses.

80k Users
60 mins Expert Faculty Ask Questions
Question

# COLUMN-I COLUMN-II(I)${\mathrm{Q}}_{\mathrm{C}}\text{\hspace{0.17em}\hspace{0.17em}\hspace{0.17em}}>\text{\hspace{0.17em}\hspace{0.17em}\hspace{0.17em}}{\mathrm{K}}_{\mathrm{C}}$(a)Forward reaction is favoured(II)${\mathrm{Q}}_{\mathrm{C}}\text{\hspace{0.17em}\hspace{0.17em}\hspace{0.17em}}<\text{\hspace{0.17em}\hspace{0.17em}\hspace{0.17em}}{\mathrm{K}}_{\mathrm{C}}$(b)Both forward and backward reactions are favoured(III)${\mathrm{Q}}_{\mathrm{C}}\text{\hspace{0.17em}\hspace{0.17em}\hspace{0.17em}}=\text{\hspace{0.17em}\hspace{0.17em}\hspace{0.17em}}{\mathrm{K}}_{\mathrm{C}}$(c)Backward reaction is favouredCorrect match is

Moderate
Solution

## ${\mathrm{Q}}_{\mathrm{C}}\text{\hspace{0.17em}\hspace{0.17em}\hspace{0.17em}}>\text{\hspace{0.17em}\hspace{0.17em}\hspace{0.17em}}{\mathrm{K}}_{\mathrm{C}}$;  ${\mathrm{Q}}_{\mathrm{C}}$ must decrease and become equal to ${\mathrm{K}}_{\mathrm{C}}$ thus  backward reaction is favoured.${\mathrm{Q}}_{\mathrm{C}}\text{\hspace{0.17em}\hspace{0.17em}\hspace{0.17em}<\hspace{0.17em}\hspace{0.17em}\hspace{0.17em}}{\mathrm{K}}_{\mathrm{C}}$;  ${\mathrm{Q}}_{\mathrm{C}}$ must increase and become equal to ${\mathrm{K}}_{\mathrm{C}}$  thus forward reaction is favoured.${\mathrm{Q}}_{\mathrm{C}}\text{\hspace{0.17em}\hspace{0.17em}\hspace{0.17em}}=\text{\hspace{0.17em}\hspace{0.17em}\hspace{0.17em}}{\mathrm{K}}_{\mathrm{C}}\text{\hspace{0.17em}\hspace{0.17em}}$; Both forward & backward reactions are favoured.

Check Your Performance Today with our Free Mock Tests used by Toppers!

For the reaction,  at certain instant $\left[\mathrm{A}\right]=2\mathrm{M},\left[\mathrm{B}\right]=10\mathrm{M},\left[\mathrm{C}\right]=1\mathrm{M}$ then