Class 11 Chemistry MCQs Equilibrium for JEE/NEET

Here, you will get Class 11 Chemistry MCQ of Chapter 7 Equilibrium for cracking JEE and NEET/AIIMS. By solving these MCQs of Class 11 Chemistry Chapter 7 Equilibrium, you will get the confidence to crack JEE or NEET. Practice MCQ Questions for Class 11 Chemistry with Answers on a daily basis and score well in exams. 

Equilibrium Class 11 MCQs Questions with Answers

For the reversible reaction N2(g) + 3H2(g) ⇌ 2NH2(g), at 500°C, the value of Kp is 1.44 × 10-5. when the partial pressure is measured in atmosphere, the corresponding value of Kc. with concentration in mol L-1 is
(a) 1.44 × 10-5/(0.082 × 500)-2
(b) 1.44 × 10-5/(8.314 × 773)-1
(c) 1.44 × 10-5/(0.082 × 773)-1
(d) 1.44 × 10-5/(0.082 × 772)-2

Answer: (d) 1.44 × 10-5/(0.082 × 772)-2

When two reactants A and B are mixed to give products C and D, the concentration quotient (Q) at initial stage of the reaction
(a) Is zero
(b) Decreases with time
(c) Is independent of time
(d) Increases with time

Answer: (d) Increases with time

The pH of a 10-10 M NaOH solution is nearest to
(a) 10
(b) 7
(c) 4
(d) -10

Answer: (c) 4

A physician wishes to prepare a buffer solution at pH = 3.85 that efficiently resists changes in pH yet contains only small concentration of the buffering agents. Which of the following weak acids together with its sodium salt would be best to use?
(a) 2, 5-Dihydroxy benzoic acid (pKa = 2.97)
(b) Acetoacetic acid (pKa = 3.58)
(c) m-Chlorobenzoic acid (pKa = 3.98)
(d) p-Chlorocinnamic acid (pKa = 4.41)

Answer: (b) Acetoacetic acid (pKa = 3.58)

The pH of a solution of hydrochloric acid is 4. The molarity of the solution is
(a) 4.0
(b) 0.4
(c) 0.0001
(d) 0.04

Answer: (c) 0.0001

In a reversible chemical reaction at equilibrium, if the concentration of any one of the reactants is doubled, then the equilibrium constant will
(a) Also be Doubled
(b) Be Halved
(c) Remain the Same
(d) Become One-Fourth

Answer: (c) Remain the Same

A weak acid HX has the dissociation constant 1 × 10-5 M. It forms a salt NaX on reaction with alkali. The degree of hydrolysis of 0.1 M solution of NaX is
(a) 0.0001%
(b) 0.01%
(c) 0.1%
(d) 0.15%

Answer: (b) 0.01%

A certain buffer solution contains equal concentration of X and HX. The ka for HX is 10-8. The pH of the buffer is
(a) 3
(b) 8
(c) 11
(d) 14

Answer: (b) 8

What is the pH of a 0.10 M solution of barium hydroxide, Ba (OH)2?
(a) 11.31
(b) 11.7
(c) 13.30
(d) None of these

Answer: (c) 13.30

For the chemical reaction 3X (g) + Y (g) ⇌ X3Y (g), the amount of X3Y at equilibrium is affected by
(a) Temperature and pressure
(b) Pressure only
(c) Temperature only
(d) Temperature, pressure and catalyst.

Answer: (a) Temperature and pressure

When sodium carbonate solution is titrated against HCl solution, the indicator used is
(a) Phenolphthalein
(b) Methyl orange
(c) Methyl red
(d) Starch

Answer: (b) Methyl orange

For the chemical reaction 2A + B ⇌ C, the units of Kp is
(a) atm-2
(b) atm-3
(c) atm-1
(d) Dimensionless

Answer: (a) atm-2

The position of some metals in the electrochemical series in decreasing electropositive character is Mg > Al > Zn > Cu > Ag. In a chemical factory, a worker by accident used a copper rod to stir a solution of aluminium nitrate; he was scared that now there would be some reaction in the solution, so he hurriedly removed the rod from the solution and observed that
(a) The rod was coated with Al
(b) An alloy of Cu and Al was being formed.
(c) The solution turned blue in colour
(d) There was no reaction

Answer: (d) There was no reaction

When equal volumes of 0.1 M NaOH and 0.01 M HCl are mixed, the hydroxide ion concentration is
(a) 7.0
(b) 1.04
(c) 12.65
(d) 2.0

Answer: (c) 12.65

Which of the following aqueous solutions will have highest pH?
(a) NaCl
(b) CH3COONa
(c) Na2CO3
(d) NH4Cl

Answer: (c) Na2CO3

A base according to Bronsted concept is a substance which can
(a) lose a pair of electrons
(b) donate protons
(c) gain a pair of electrons
(d) accept protons

Answer: (d) accept protons

The rate of forward reaction is two times that of the reverse reaction at a given temperature and identical concentration, k(equilibrium) is
(a) 0.5
(b) 1.5
(c) 2.5
(d) 2.0

Answer: (d) 2.0

The following equilibria are given
N2 + 3H2 ⇌ 2NH3 K1
N2 + O2 ⇌ 2NO K2
H2 + 1/2O2 ⇌ H2O K3

The equilibrium constant for the reaction 2NH3 + 5/2O2 ⇌ 2NO + 3H2O in terms of K1, K2, K3, is
(a) K1 K2 K3
(b) K1 K2/K3
(c) K1 K23/K2
(d) K2K23/K1

Answer: (d) K2K23/K1

The Ksp for HgS, Ag2S and PbS are 10-3, 10-45 and 10-50 respectively. The solubilities are in the order
(a) HgS > Ag2S > PbS
(b) HgS < PbS < Ag2S
(c) PbS > Ag2S > HgS
(d) Ag2S > HgS > PbS

Answer: (d) Ag2S > HgS > PbS

Aluminium chloride is
(a) Bronsted Lowry acid
(b) Arrhenius acid
(c) Lewis acid
(d) Lewis base

Answer: (c) Lewis acid

For a sparingly soluble salt ApBq the relationship between its solubility product (Ls) and its solubility (s) is
(a) Ls = sp+q ppqq
(b) Ls = sp+q Pqqp
(c) Ls = spqPpqq
(d) Ls = spq (pq)q+p

Answer: (a) Ls = sp+q ppqq

Among the following the weakest Bronsted base is
(a) F
(b) Cl
(c) Br
(d) I

Answer: (d) I–

The pH of 10-8 M HCl is
(a) 8
(b) 7
(c) between 7 and 8
(d) between 6 and 7

Answer: (d) between 6 and 7

The reaction quotient (Q) for the reaction N2 (g) + 3H2 (g) ⇌ 2NH3 (g) is given by Q = [NH3]²/[N2][H2]³. The reaction will proceed from right to left if
(a) Q = Kc
(b) Q < Kc
(c) Q > Kc
(d) Q = 0

Answer: (c) Q > Kc

In the case of a gaseous homogeneous reaction, the active mass of the reactant is obtained by the expression
(a) PV/RT
(b) P/RT
(c) RT/P
(d) (n/V) RT

Answer: (b) P/RT

1 mole of N2 and 2 moles of H2 are allowed to react in a 1 dm³ vessel. At equilibrium 0.8 mole of NH3 is formed. The concentration of H2 in the vessel is
(a) 0.6 mole
(b) 0.8 mole
(c) 0.2 mole
(d) 0.4 mole

Answer: (b) 0.8 mole

When a neutral atom undergoes oxidation, the atoms oxidation state
(a) Decreases as it gains electrons
(b) Decreases as it loses electrons
(c) Increases as it gains electrons
(d) Increases as it loses electrons

Answer: (d) Increases as it loses electrons

Water is a
(a) Protophobic solvent
(b) Protophilic solvent
(c) Amphiprotic solvent
(d) Aprotic solvent

Answer: (c) Amphiprotic solvent

Consider the following equilibrium in a closed container N2O4 (g) ⇌ 2NO2 (g).
At a fixed temperature, the volume of the reaction container is halved. For this change, which of the following statements hold true regarding the equilibrium constant (Kp) and degree of dissociation (α)?
(a) Neither Kp nor α changes
(b) Both Kp and α change
(c) Kp changes but α does not change
(d) Kp does not change but α changes

Answer: (b) Both Kp and α change

The solubility of Ca3​(PO4​​)2​ in water is y mol/L. Its solubility product is:
(a) 6y²
(b) 36 y4
(c) 64 y5
(d) 108 y5

Answer: (d) 108 y5

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