NEET (UG)

Practice Test 1 — Equilibrium

12 questions • 18 minutes • auto-graded with full solutions

⏱ 18:00

0 / 12 answered

[object Object]

0 / 12

0Correct

0Wrong

0Skipped

0:00Time used

Back to Study

Section A — MCQ (Single Correct & Statement-based)

Question 1

Chemical equilibrium is described as:

Solution: Forward and reverse rates equal — dynamic.

Question 2

For a reaction with $\Delta n_g = 0$, $K_p$ equals:

Solution: $(RT)^0 = 1$, so $K_p = K_c$.

Question 3

Raising the temperature of an exothermic equilibrium shifts it:

Solution: Heat added favours the endothermic (reverse) direction.

Question 4

Statements: (I) A catalyst does not change K. (II) Only temperature changes K. Which are correct?

Solution: Both are correct.

Question 5

The pH of $0.01\ \text{M}$ HCl is:

Solution: $[\text{H}^+]=10^{-2}$, pH $= 2$.

Question 6

The conjugate acid of $\text{NH}_3$ is:

Solution: Adding $\text{H}^+$ gives $\text{NH}_4^+$.

Question 7

At the point where $[\text{salt}] = [\text{acid}]$ in a buffer, pH equals:

Solution: $\log 1 = 0$, so $\text{pH} = \text{p}K_a$.

Question 8

Adding a common ion to a saturated solution makes the salt:

Solution: Common-ion effect lowers solubility.

Section B — Assertion & Reason

Question 9

A: A catalyst does not increase the equilibrium yield of a reaction.
R: A catalyst speeds up the forward and reverse reactions equally.

Solution: Equal speed-up of both directions means the position (and yield) is unchanged — R explains A.

Question 10

A: Adding an inert gas at constant volume does not shift a gaseous equilibrium.
R: At constant volume the partial pressures of the reacting gases are unchanged.

Solution: Unchanged partial pressures mean no shift — R explains A.

Question 11

A: An aqueous solution of sodium chloride is basic.
R: NaCl is the salt of a strong acid and a strong base.

Solution: A salt of a strong acid and strong base gives a neutral solution, so A is false; R correctly states NaCl's origin.

Question 12

A: A buffer solution resists changes in pH on adding small amounts of acid or base.
R: A buffer contains a weak acid and its salt (or a weak base and its salt) that neutralise added base or acid.

Solution: The weak-acid/salt pair mops up added acid or base, holding pH steady — R explains A.