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Strength of Acids and Bases

The salt whos...

Question

The salt whose aqueous solution will turn blue litmus to red is:
(a) ammonium sulphate
(b) sodium acetate
(c) sodium chloride
(d) potassium carbonate

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Solution

a). ammonium sulphate

Ammonium sulphate [(NH₄)₂SO₄] is formed from a weak base, ammonium hydroxide (NH₄OH), and a strong acid, sulphuric acid (H₂SO₄). On dissolving in water, (NH₄)₂SO₄ hydrolyses to form more H⁺ ions than OH^- ions. As the aqueous solution of the salt (NH₄)₂SO₄ is acidic, it turns blue litmus red.

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The salt whose aqueous solution will turn blue litmus to red is :

(a) ammonium sulphate

(b) sodium acetate

(c) sodium chloride

(d) potassium carbonate

The aqueous solution of one of the following salts will turn red litmus to blue. This salt is :

(a) potassium sulphate

(b) sodium sulphate

(c) sodium chloride

(d) potassium carbonate

Identify the odd one out and justify.

(a) Chloride, nitrate, hydride, ammonium

(b) Hydrogen chloride, sodium hydroxide, calcium oxide, ammonia

(c) Acetic acid, carbonic acid, hydrochloric acid, nitric acid

(d) Ammonium chloride, sodium chloride, potassium nitrate, sodium sulphate

(e) Sodium nitrate, sodium carbonate, sodium sulphate, sodium chloride

(f) Calcium oxide, magnesium oxide, zinc oxide, sodium oxide.

(g) Crystalline blue vitriol, crystalline common salt, crystalline ferrous sulphate, crystalline sodium carbonate.

(h) Sodium chloride, potassium hydroxide, acetic acid, sodium acetate.

Q. P and Q are aqueous solutions of sodium chloride and sodium hydroxide, respectively. Which of these will turn:
(a) blue litmus red?
(b) red litmus blue?

Q. Sodium carbonate (

N a_{2} C O_{3}

) is an acidic salt whose solution in water turns blue litmus to red.

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