Ques. 1AIPMT 2003
The reaction quotient (Q) for the reaction N2(g) + 3H2(g) 2NH3(g) is given by Q = [NH3]2[N2][H2]3. The reaction will proceed from right to left if
- Q = Kc
- Q < Kc
- Q > Kc
- Q = 0
Answer
(3) Q > Kc
Solution
As per NCERT:
If Qc < Kc ⇒ the reaction proceeds in the forward direction (left to right).
If Qc > Kc ⇒ the reaction proceeds in the reverse direction (right to left).
If Qc = Kc ⇒ the reaction mixture is at equilibrium.
∵ When Q > Kc there is excess product (NH3), it decomposes to bring Q down to Kc.
Answer: (3)