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Chemical Equilibrium Set-1 MCQ Online Practice Test | Class 11 | Quiz Tweek

Chemical Equilibrium Set-1

Practice Important MCQs for Chemical Equilibrium — Chemistry, Class 11.

Chemical Equilibrium is a cornerstone chapter in Class 11 Chemistry, serving as a bridge between basic stoichiometry and advanced thermodynamics. For the CBSE 2024-25 exams, this chapter holds significant weightage as it introduces students to the dynamic nature of chemical reactions, the quantitative measurement of equilibrium constants, and the predictable shifts in systems under stress. Understanding how reactions achieve a state of balance is not only vital for scoring well in theory papers but also essential for competitive exams like JEE and NEET.

This quiz is meticulously designed to align with the latest NCERT curriculum, focusing on both physical and chemical equilibrium. It covers critical concepts such as the Law of Mass Action, Le Chatelier’s Principle, and the intricacies of ionic equilibrium including pH calculations and solubility products. By practicing these 30 high-quality MCQs, students will strengthen their conceptual clarity and improve their problem-solving speed for the upcoming academic session.

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30

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Q1. For the reversible reaction $N_2(g) + 3H_2(g) \rightleftharpoons 2NH_3(g)$ , the relationship between $N_2(g) + 3H_2(g) \rightleftharpoons 2NH_3(g)$ and $K_c$ is:

(A)

$K_p = K_c(RT)^{-2}$

(B)

$K_p = K_c(RT)^{2}$

(C)

$K_p = K_c(RT)^{-1}$

(D)

$K_p = K_c(RT)^{1}$

Q2. In which of the following reactions does the equilibrium remain unaffected by a change in pressure?

(A)

$PCl_5(g) \rightleftharpoons PCl_3(g) + Cl_2(g)$

(B)

$N_2(g) + O_2(g) \rightleftharpoons 2NO(g)$

(C)

$N_2O_4(g) \rightleftharpoons 2NO_2(g)$

(D)

$2SO_2(g) + O_2(g) \rightleftharpoons 2SO_3(g)$

Q3. According to Le Chatelier’s principle, adding heat to an exothermic reaction in equilibrium will:

(A)

Shift the equilibrium to the right

(B)

Shift the equilibrium to the left

(C)

Have no effect on the equilibrium

(D)

Increase the value of $K_c$

Q4. What is the unit of $K_p$ for the reaction: $CaCO_3(s) \rightleftharpoons CaO(s) + CO_2(g)$ ?

(A)

$atm^2$

(B)

$atm^{-1}$

(C)

$atm$

(D)

Unitless

Q5. The pH of a $10^{-8} M$ $HCl$ solution is:

(A)

8

(B)

7

(C)

Between 6 and 7

(D)

Between 7 and 8

Q6. Which of the following is a Lewis acid?

(A)

$NH_3$

(B)

$H_2O$

(C)

$BF_3$

(D)

$OH^-$

Q7. If the solubility product of $AgCl$ is $1.8 \times 10^{-10}$ , its solubility in water is:

(A)

$1.34 \times 10^{-5} mol/L$

(B)

$1.8 \times 10^{-5} mol/L$

(C)

$0.9 \times 10^{-10} mol/L$

(D)

$3.6 \times 10^{-10} mol/L$

Q8. A buffer solution can be prepared by mixing:

(A)

Strong acid and its salt with strong base

(B)

Weak acid and its salt with strong base

(C)

Strong base and its salt with strong acid

(D)

Pure water and any salt

Q9. If the equilibrium constant for $A + B \rightleftharpoons C$ is $K$ , what is the equilibrium constant for $2C \rightleftharpoons 2A + 2B$ ?

(A)

$2K$

(B)

$K^2$

(C)

$\frac{1}{K^2}$

(D)

$\sqrt{K}$

Q10. The conjugate base of $H_2PO_4^-$ is:

(A)

$H_3PO_4$

(B)

$HPO_4^{2-}$

(C)

$PO_4^{3-}$

(D)

$H_4PO_4$

Q11. At $298 K$ , the $pH + pOH$ of any aqueous solution is always:

(A)

0

(B)

7

(C)

14

(D)

Dependent on concentration

Q12. If $Q_c < K_c$ for a reaction, the reaction will:

(A)

Proceed in the forward direction

(B)

Proceed in the backward direction

(C)

Be at equilibrium

(D)

Stop immediately

Q13. Which factor will change the value of the equilibrium constant $K$ ?

(A)

Change in pressure

(B)

Change in concentration

(C)

Presence of a catalyst

(D)

Change in temperature

Q14. For the reaction $H_2(g) + I_2(g) \rightleftharpoons 2HI(g)$ , if the volume of the container is doubled, the equilibrium constant will:

(A)

Double

(B)

Halve

(C)

Remain unchanged

(D)

Quadruple

Q15. The degree of dissociation of a weak electrolyte increases with:

(A)

Increase in concentration

(B)

Decrease in temperature

(C)

Dilution

(D)

Addition of a common ion

...and 15 more challenging questions available in the interactive simulator.

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