PractifyUs

NEET Chemistry · Equilibrium

Chemical equilibrium: Kp, Kc and Gibbs energy

Taught in NCERT Class 11 Chemistry, Chapter 6: Equilibrium.

1 verified question: Easy 0 · Medium 1 · NEET level 0

Sample questions

Sample 1Medium

For the reaction N2(g) + 3H2(g) ⇌ 2NH3(g), which relation between K_p and K_c is correct?

  1. A

    K_p = K_c(RT)^2

  2. B

    K_p = K_c

  3. C

    K_p = K_c(RT)^-2

  4. D

    K_p = K_c(RT)^-1

Show the answer
The answer is C.

K_p = K_c(RT)^Δn, where Δn = moles of gaseous products − moles of gaseous reactants = 2 − 4 = −2. So K_p = K_c(RT)^-2.

  • A.

    This uses Δn = +2; the number of gaseous moles decreases, so Δn is −2.

  • B.

    K_p = K_c only when Δn = 0, which is not the case here.

  • D.

    This uses Δn = −1, which does not match the stoichiometry.

NCERT: Class 11 Chemistry, Chapter 6, 6.4

Practise Chemical equilibrium: Kp, Kc and Gibbs energy

Practice at the level you choose, with the answer after every question; timed tests with the answers when you submit. Every question is verified against NCERT first.

Sign in to practise

More in Equilibrium