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Equilibrium — NEET Chemistry MCQs

30 questions written by hand against the NCERT chapter. Every wrong option is explained, not just the right one.

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Sample questions from this chapter

What is true when a reversible reaction reaches dynamic equilibrium?
  1. Forward and reverse rates are equal while both reactions continue ✓
  2. Reactant and product concentrations become equal
  3. Molecular collisions stop but concentrations remain fixed
  4. The forward reaction finishes before the reverse reaction begins
Answer: A. Dynamic equilibrium means equal opposing rates, so macroscopic composition is constant despite continuing molecular conversion. Equal rates must not be confused with equal concentrations.
Why not B: Equilibrium requires constant concentrations, not equal numerical concentrations of reactants and products.
Why not C: Microscopic reactions and collisions continue; only the net composition change vanishes.
Why not D: Forward and reverse processes occur simultaneously and approach equal rates.
For H2 + I2 ⇌ 2HI, equilibrium concentrations are 0.20 M, 0.20 M and 0.80 M, respectively. What is Kc?
  1. 4.0
  2. 8.0
  3. 16 ✓
  4. 20
Answer: C. Kc = [HI]^2/([H2][I2]) = 0.80^2/(0.20×0.20) = 16. The 4.0 trap is the classic dropped product coefficient.
Why not A: This uses [HI]/([H2][I2]) and drops the exponent 2 on HI.
Why not B: This divides 0.80 by only one reactant concentration, omitting the other.
Why not D: This divides [HI] by the product 0.04 and still omits the square.
For CO + H2O ⇌ CO2 + H2, Kc = 4.00. Initially [CO] = [H2O] = 0.100 M and no products are present. What are the equilibrium concentrations in the order CO, H2O, CO2, H2?
  1. 0.0333 M, 0.0333 M, 0.0667 M, 0.0667 M ✓
  2. 0.0500 M, 0.0500 M, 0.0500 M, 0.0500 M
  3. 0.0667 M, 0.0667 M, 0.0333 M, 0.0333 M
  4. 0.0200 M, 0.0200 M, 0.0800 M, 0.0800 M
Answer: A. Let each product be x: K = [x/(0.100−x)]^2 = 4, so x/(0.100−x) = 2 and x = 0.0667 M. Reactants are 0.0333 M.
Why not B: This assumes equal reactant and product concentrations imply K = 4, but that composition gives K = 1.
Why not C: This uses x/(0.100−x) = 1/2, taking the reciprocal of √K.
Why not D: This sets product-to-reactant concentration ratio equal to K = 4 instead of √K = 2.

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Questions

How many NEET questions are there on Equilibrium?

This chapter test has 30 questions — 10 easy, 14 medium and 6 hard — all written against the NCERT Class 11 chapter.

Is this NEET Chemistry chapter test free?

Yes. Every chapter test is free with no login, and you get your all-India rank on every one. Nothing on the site is on sale right now.

Do the questions explain the wrong options?

Yes — every distractor carries its own explanation naming the specific misconception that makes a student pick it. That is the part most question banks skip, and it is the part that changes your next attempt.