MCQs On Equilibrium State
1. Equimolar solutions of the following compounds are prepared separately in water. Which will have the lowest pH value?
(a) BeCl2
(b) SrCl2
(c) CaCl2
(d) MgCl2
Answer:::: (a)
2. Addition of which chemical will decrease the hydrogen ion concentration of an acetic acid solution?
(a) NH4Cl
(b) Al2(SO4)3
(c) AgNO3
(d) NaCN
Answer:::: (d)
3. In some solutions, the concentration of H3O+ remains constant even when small amounts of strong acid or strong base are added to them. These solutions are known as
(a) ideal solution
(b) colloidal solution
(c) true solution
(d) buffer solution
Answer:::: (d)
4. All compounds are in equilibrium in a reversible reaction. If reactants are doubled in concentration the equilibrium constant would be
(a) reduced to half its original value
(b) reduced to one-fourth of its original value
(c) doubled
(d) constant
Answer:::: (d)
5. The solubility of Fe(OH)3 would be maximum in
(a) 0.1M NaOH
(b) 0.1M HCl
(c) 0.01M KOH
(d) 0.1M H2SO4
Answer:::: (d)
6. Which of the following sulphides has the largest value of Ksp?
(a) CuS
(b) CdS
(c) PbS
(d) ZnS
Answer:::: (d)
7. According to Le Chatelier’s principle adding heat to a solid and liquid in equilibrium will cause the
(a) amount of solid to decrease
(b) amount of liquid to decrease
(c) temperature to rise
(d) temperature to fall
Answer:::: (a)
8. 0.1M solution of which of the substances will be basic?
(a) sodium borate
(b) ammonium chloride
(c) calcium nitrate
(d) sodium sulphate
Answer:::: (a)
9. At a certain temperature 2HI ⥨ H2 + I2 only 50% HI is dissociated at equilibrium. The equilibrium constant is
(a) 0.25
(b) 1.0
(c) 3.0
(d) 0.6
Answer:::: (a)
10. Which has the highest degree of ionization?
(a) 0.1M NH3
(b) 0.001M NH3
(c) 0.1M NH3
(d) 0.0001M NH3
Answer:::: (d)
