Equilibrium NEET 2026 Practice Test | Chemical & Ionic Equilibrium MCQs

Equilibrium – NEET 2026 Practice Test

This test covers Chemical Equilibrium & Ionic Equilibrium. All questions are NEET-level, repeatedly asked and extremely important.

Find out the solubility of Ni(OH)₂ in 0.1 M NaOH. Given that the ionic product of Ni(OH)₂ is 2 × 10⁻¹⁵.

2 × 10⁻⁸ M

1 × 10⁻¹³ M

1 × 10⁸ M

2 × 10⁻¹³ M

For the reaction A(g) ⇌ 2B(g), the backward reaction rate constant is higher than the forward reaction rate constant by a factor of 2500 at 1000 K. K_p for the reaction at 1000 K is [Given: R = 0.0831 L atm mol⁻¹ K⁻¹]

0.033

0.021

83.1

2.077 × 10⁵

For a weak acid HA, the percentage of dissociation is nearly 1% at equilibrium. If the concentration of acid is 0.1 mol L⁻¹, then the correct option for its K_a is

1 × 10⁻⁴

1 × 10⁻⁶

1 × 10⁻⁵

1 × 10⁻³

In which of the following equilibrium K_c and K_p are not equal?

2NO(g) ⇌ N₂(g) + O₂(g)

SO₂(g) + NO₂(g) ⇌ SO₃(g) + NO(g)

H₂(g) + I₂(g) ⇌ 2HI(g)

2C(s) + O₂(g) ⇌ 2CO₂(g)

The percentage of pyridine (C₅H₅N) that forms pyridinium ion (C₅H₅NH⁺) in a 0.10 M aqueous pyridine solution (K_b for C₅H₅N = 1.7 × 10⁻⁹) is

0.0060%

0.013%

0.77%

1.6%

Accumulation of lactic acid (HC₃H₅O₃), a monobasic acid, in tissues leads to pain. In a 0.10 M aqueous solution, lactic acid is 3.7% dissociated. The value of dissociation constant K_a is

1.4 × 10⁻⁵

1.4 × 10⁻⁴

3.7 × 10⁻⁴

2.8 × 10⁻⁴

Equimolar solutions of the following substances were prepared separately. Which one of these will record the highest pH value?

BaCl₂

AlCl₃

LiCl

BeCl₂

If the molar conductivity (Λ_m) of a 0.050 mol L⁻¹ solution of a monobasic weak acid is 90 S cm² mol⁻¹, its degree of dissociation will be [Λ°⁺ = 349.6 S cm² mol⁻¹ and Λ°⁻ = 50.4 S cm² mol⁻¹]

0.225

0.215

0.115

0.125

For a given exothermic reaction, K_p and K′_p are equilibrium constants at temperatures T₁ and T₂ respectively. Assuming heat of reaction is constant, it is observed that

K_p > K′_p

K_p < K′_p

K_p = K′_p

K_p = 1 / K′_p

Consider the following liquid–vapour equilibrium.
Liquid ⇌ Vapour
Which of the following relations is correct?

d(ln P)/dT² = −ΔH_v/T²

d(ln P)/dT = ΔH_v / RT²

d(ln G)/dT² = ΔH_v / RT²

d(ln P)/dT = −ΔH_v / RT