Ionic Equilibrium Additional Practice Test

12th Standard Chemistry — Ionic Equilibrium: Additional Online Practice Test

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According to the Arrhenius theory, which of the following best describes a base?

A.A substance that donates a proton to another substance B.A species that accepts an electron pair C.A substance that dissociates to give hydroxyl ions in water D.A species that donates a proton to water

In the Lowry-Bronsted concept, what is the conjugate acid formed when \(H_2O\) acts as a base and accepts a proton?

A.\(OH^-\) B.\(H_3O^+\) C.\(H_2O_2\) D.\(H_2\)

Which of the following is classified as a Lewis acid due to being an electron-deficient molecule?

A.\(NH_3\) B.\(H_2O\) C.\(BF_3\) D.\(F^-\)

If an aqueous solution has a hydronium ion concentration \([H_3O^+]\) of \(1 \times 10^{-4}\) M, what is its pH?

A.4 B.10 C.7 D.14

The ionic product of water (\(K_w\)) is known to increase when which of the following occurs?

A.Pressure is decreased B.Temperature is increased C.A strong acid is added D.A strong base is added

According to Ostwald's dilution law, the degree of dissociation (\(\alpha\)) of a weak electrolyte is:

A.Directly proportional to the molar concentration B.Inversely proportional to the square root of concentration C.Independent of the volume of the solution D.Equal to the square of the dissociation constant

What is the term for the suppression of a weak acid's dissociation by adding a salt that contains a shared ion?

A.Buffer action B.Salt hydrolysis C.Common ion effect D.Electrolysis

Which of the following combinations would produce an acidic buffer solution?

A.\(NH_4OH\) and \(NH_4Cl\) B.\(CH_3COOH\) and \(CH_3COONa\) C.\(HCl\) and \(NaCl\) D.\(NaOH\) and \(NaCl\)

Identify the Henderson-Hasselbalch equation used specifically to calculate the pOH of a basic buffer.

A.\(pH = pK_a + \log \frac{[salt]}{[acid]}\) B.\(pOH = pK_b + \log \frac{[salt]}{[base]}\) C.\(pH = pK_w - pOH\) D.\(K_h = \frac{K_w}{K_a}\)

Q10

An aqueous solution of ammonium chloride (\(NH_4Cl\)) is acidic because of the hydrolysis of which species?

A.The \(Cl^-\) ion B.The \(NH_4^+\) ion C.The entire \(NH_4Cl\) molecule D.Water molecules only

Q11

Which of the following salts will form a neutral aqueous solution with a pH of 7 at 298K?

A.\(CH_3COONa\) B.\(NH_4Cl\) C.\(NaCl\) D.\(Na_2CO_3\)

Q12

For the sparingly soluble salt silver chromate (\(Ag_2CrO_4\)), the solubility product (\(K_{sp}\)) expression is:

A.\([Ag^+][CrO_4^{2-}]\) B.\([Ag^+][CrO_4^{2-}]^2\) C.\([Ag^+]^2[CrO_4^{2-}]\) D.\([Ag^+] + [CrO_4^{2-}]\)

Q13

If 's' represents the molar solubility of \(Ag_2CrO_4\) in water, how is \(K_{sp}\) related to 's'?

A.\(K_{sp} = s^2\) B.\(K_{sp} = 4s^2\) C.\(K_{sp} = 4s^3\) D.\(K_{sp} = 27s^4\)

Q14

In which condition will a precipitate definitely form when two solutions are mixed?

A.Ionic Product is equal to \(K_{sp}\) B.Ionic Product is less than \(K_{sp}\) C.Ionic Product is greater than \(K_{sp}\) D.Ionic Product is zero

Q15

Which of the following species acts as a Lewis base by donating an electron pair to form a coordinate bond?

A.\(Fe^{3+}\) B.\(BF_3\) C.\(NH_3\) D.\(AlCl_3\)

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About this Ionic Equilibrium test

This free online practice test covers Ionic Equilibrium from the 12th Standard Chemistry (Samacheer Kalvi) syllabus. Choose the number of questions and an optional time limit, then answer and submit — everything is checked in your browser, with the correct answers and a worked explanation shown at the end. For the full solutions to every question in this set, see the solved MCQs page.

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