621.

An example of a salt that will not hydrolyse is

• CH₃COONH₄

• CH₃COOK

• NH₄Cl

• KCl

20 mL of 0.25 N strong acid and 30 mL 0·2 N of strong base are mixed; the resulting solution is

• 0.02 N acidic

• 0.025 N basic

• 0.02 N basic

• 0.025 N acidic

The rate of forward reaction is two times that of reverse reaction at a given temperature and identical concentration. K

• 2.5

• 2.0

• 0.5

• 1.5

Ammonium ion is

• neither an acid nor base

• both an acid and a base

• a conjugate acid

• a conjugate base

A is an aqueous acid; B is an aqueous base. They are diluted separately, then

• pH of A decreases and pH of B increases

• pH of A increases and pH of B decreases till pH in each case is 7

• pH of A and B increase

• pH of B and A decrease

What is the solubility of silver bromide in one litre of 0.4 molar NH₃ solution (K =10x10⁸)?

• 80 × 10^-6 mol

• 2.8 × 10^-3 mol

• 115 × 10^-3 mol

• 0.98 g

_ZX^M + ₂He⁴ → ₁₅P³⁰ + ₀n¹. Then

• Z = 12, M = 27

• Z = 13, M = 27

• Z = 12, M = 17

• Z = 13, M = 28

Which expression has no physical significance?

• ${\left(\frac{\partial \mathrm{G}}{\partial \mathrm{T}}\right)}_{\mathrm{p}}$

• ${\left(\frac{\partial \mathrm{G}}{\partial \mathrm{p}}\right)}_{\mathrm{T}}$

• ${\left(\frac{\partial (∆\mathrm{G})}{\partial \mathrm{T}}\right)}_{\mathrm{p}}$

• ${\left(\frac{\partial (∆\mathrm{G})}{\partial \mathrm{p}}\right)}_{\mathrm{T}}$

Heat of neutralisation of weak acid and strong base is less than the heat of neutralisation of strong acid and strong base due to

• energy has to be spent for the total dissociation of weak acid

• salt of weak acid and strong base is not stable

• incomplete dissociation of weak acid

• incomplete neutralisation of weak acid

A colourless crystalline salt 'x' is soluble in dilute HCl. On adding NaOH solution, it gives a white precipitate which is insoluble in excess of NaOH. 'x' is

• Al₂(SO₄)₃

• ZnSO₄

• MgSO₄

• SnCl₂