MERIT YARD

Class 11 Chem - Equilibrium - MERIT YARD

1 / 40In a chemical equilibrium, the rate of forward reaction is strictly equal to the rate of:

A) Backward reaction

B) Zero

C) Formation of catalyst

D) Evaporation

2 / 40What is the exact mathematical relationship between \( K_p \) and \( K_c \)?

A) \( K_p = K_c \)

B) \( K_p = K_c(RT)^{\Delta n} \)

C) \( K_c = K_p(RT)^{\Delta n} \)

D) \( K_p = K_c / (RT) \)

3 / 40If the equilibrium constant for the forward reaction \( A \rightleftharpoons B \) is \( K \), then for \( B \rightleftharpoons A \) it is:

A) \( -K \)

B) \( K^2 \)

C) \( 1/K \)

D) \( 0 \)

4 / 40A chemical catalyst added to a reversible reaction strictly alters the:

A) Equilibrium constant

B) Enthalpy of reaction

C) Position of equilibrium

D) Rate of reaction

5 / 40According to Le Chatelier's principle, an increase in pressure on a gaseous system shifts the equilibrium towards the side with:

A) Fewer moles of gas

B) More moles of gas

C) Higher temperature

D) Lower temperature

6 / 40An Arrhenius acid is scientifically defined as a substance that yields which specific ion in an aqueous solution?

A) \( OH^- \)

B) \( H^+ \)

C) \( Cl^- \)

D) \( Na^+ \)

7 / 40According to the Bronsted-Lowry theory, an acid is strictly defined as a:

A) Proton acceptor

B) Electron pair donor

C) Proton donor

D) Electron pair acceptor

8 / 40According to Lewis theory, a base is strictly defined as an:

A) Electron pair acceptor

B) Proton donor

C) Proton acceptor

D) Electron pair donor

9 / 40The exact value of the ionic product of water
\( (K_w) \) at 298 K is:

A) \( 10^{-14} \)

B) \( 10^{-7} \)

C) \( 14 \)

D) \( 7 \)

10 / 40What is the exact mathematical formula used to calculate pH?

A) \( \log[H^+] \)

B) \( -\log[H^+] \)

C) \( \ln[H^+] \)

D) \( 10^{-pH} \)

11 / 40For a strictly neutral aqueous solution at 298 K, the exact pH value is:

A) \( 0 \)

B) \( 14 \)

C) \( 7 \)

D) \( 1 \)

12 / 40If the pH of an aqueous solution is strictly less than 7, the solution is considered:

A) Basic

B) Neutral

C) Amphoteric

D) Acidic

13 / 40For any aqueous solution at 298 K, the sum
\( pH + pOH \) is exactly equal to:

A) \( 14 \)

B) \( 7 \)

C) \( 0 \)

D) \( 10^{-14} \)

14 / 40What is the corresponding conjugate base of Hydrochloric Acid \( (HCl) \)?

A) \( H^+ \)

B) \( Cl^- \)

C) \( H_2Cl^+ \)

D) \( OH^- \)

15 / 40What is the corresponding conjugate acid of Ammonia \( (NH_3) \)?

A) \( NH_2^- \)

B) \( OH^- \)

C) \( NH_4^+ \)

D) \( H_3O^+ \)

16 / 40A solution whose pH does not change significantly on adding a small amount of strong acid or base is called a:

A) Saturated solution

B) Neutral solution

C) Standard solution

D) Buffer solution

17 / 40In an equilibrium constant expression, the active mass (concentration) of a pure solid or liquid is always taken as:

A) \( 1 \)

B) \( 0 \)

C) Infinity

D) \( 100 \)

18 / 40Which of the following acids is scientifically classified as a completely Strong Acid?

A) \( CH_3COOH \)

B) \( HCl \)

C) \( H_2CO_3 \)

D) \( HCN \)

19 / 40Which of the following bases is scientifically classified as a Weak Base?

A) \( NaOH \)

B) \( KOH \)

C) \( NH_4OH \)

D) \( Ba(OH)_2 \)

20 / 40The mathematical 'Solubility Product Constant' for sparingly soluble salts is strictly denoted by the symbol:

A) \( K_a \)

B) \( K_w \)

C) \( K_p \)

D) \( K_{sp} \)

21 / 40For an endothermic reaction, increasing the temperature strictly shifts the equilibrium to the:

A) Forward direction (Right)

B) Backward direction (Left)

C) Upward direction

D) No shift occurs

22 / 40The "Degree of Dissociation" of a weak electrolyte is mathematically denoted by the Greek letter:

A) \( \beta \)

B) \( \alpha \)

C) \( \gamma \)

D) \( \sigma \)

23 / 40Which formula correctly represents Ostwald's dilution law for a weak acid?

A) \( K_a = C\alpha \)

B) \( K_a = \frac{C^2\alpha}{1-\alpha} \)

C) \( K_a = \frac{C\alpha^2}{1-\alpha} \)

D) \( K_a = \frac{1-\alpha}{C\alpha^2} \)

24 / 40The visual color of Phenolphthalein indicator in a highly basic (alkaline) medium is strictly:

A) Colorless

B) Blue

C) Red

D) Pink

25 / 40The term 'dynamic equilibrium' chemically implies that the reversible reaction has:

A) Not stopped, but rates are equal

B) Completely stopped

C) Reached 100% completion

D) Irreversible nature

26 / 40If \( \Delta n = 0 \) for a gaseous reaction, then the exact relationship between \( K_p \) and \( K_c \) is:

A) \( K_p > K_c \)

B) \( K_p = K_c \)

C) \( K_p < K_c \)

D) \( K_p = 0 \)

27 / 40A Lewis acid is defined as a chemical species that is strictly an:

A) Electron pair donor

B) Proton donor

C) Electron pair acceptor

D) Proton acceptor

28 / 40If the concentration of \( H^+ \) ions is \( 10^{-3} \text{ M} \), the exact pH of the solution is:

A) \( 11 \)

B) \( -3 \)

C) \( 0.001 \)

D) \( 3 \)

29 / 40The famous Henderson-Hasselbalch equation for calculating the pH of an acidic buffer is:

A) \( pH = pK_a + \log\frac{[\text{Salt}]}{[\text{Acid}]} \)

B) \( pH = pK_a - \log\frac{[\text{Salt}]}{[\text{Acid}]} \)

C) \( pH = pK_b + \log\frac{[\text{Salt}]}{[\text{Base}]} \)

D) \( pH = \log\frac{[\text{Acid}]}{[\text{Salt}]} \)

30 / 40The corresponding conjugate base of Water
\( (H_2O) \) is strictly:

A) \( H_3O^+ \)

B) \( OH^- \)

C) \( O^{2-} \)

D) \( H^+ \)

31 / 40In a reversible reaction, if the concentration of reactants is suddenly increased, the equilibrium shifts:

A) Backward

B) Upward

C) Forward

D) It remains unchanged

32 / 40At absolute chemical equilibrium, the Gibbs free energy change \( (\Delta G) \) is exactly:

A) Positive

B) Negative

C) \( \infty \)

D) \( 0 \)

33 / 40Which among the following specific molecules is a classic example of a Lewis base?

A) \( NH_3 \)

B) \( BF_3 \)

C) \( AlCl_3 \)

D) \( H^+ \)

34 / 40If the equilibrium constant \( K_c \) is very large \( (> 10^3) \), it strictly implies the reaction is:

A) Barely proceeding

B) Almost nearing completion

C) Moving backward

D) At absolute zero

35 / 40For the reaction \( N_2(g) + 3H_2(g) \rightleftharpoons 2NH_3(g) \), the value of \( \Delta n \) is exactly:

A) \( 2 \)

B) \( 1 \)

C) \( -2 \)

D) \( -1 \)

36 / 40The standard unit of the equilibrium constant \( K_c \) for \( H_2(g) + I_2(g) \rightleftharpoons 2HI(g) \) is strictly:

A) \( \text{mol L}^{-1} \)

B) \( \text{L mol}^{-1} \)

C) \( \text{mol}^2 \text{L}^{-2} \)

D) Unitless

37 / 40Which famous principle accurately predicts the effect of a change in conditions on a chemical equilibrium?

A) Le Chatelier's Principle

B) Pauli's Principle

C) Heisenberg's Principle

D) Aufbau Principle

38 / 40An aqueous mixture consisting of a weak acid and its salt with a strong base forms an:

A) Basic buffer

B) Acidic buffer

C) Neutral solution

D) Ideal solution

39 / 40In a solution, if the Ionic Product is strictly greater than the Solubility Product \( (K_{sp}) \), then:

A) The solution is unsaturated

B) More salt can be dissolved

C) Precipitation strictly occurs

D) It forms a buffer

40 / 40What is the corresponding conjugate acid of Water
\( (H_2O) \)?

A) \( OH^- \)

B) \( O^{2-} \)

C) \( H^+ \)

D) \( H_3O^+ \)

Test Analysis

Correct ✅ 0

Wrong ❌ 0

Unattempted ⚠️ 40

Accuracy 🎯 0%

Time Taken ⏱️ 00m 00s

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