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

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Solution

(d) Potassium carbonate

Potassium carbonate ( $K_{2} C O_{3}$ ) is formed from a weak acid, carbonic acid ( $H_{2} C O_{3}$ ), and a strong base, potassium hydroxide ( $K O H$ ). On hydrolysis, $K_{2} C O_{3}$ forms more $O H^{-}$ ions than $H^{+}$ ions. Thus, it is basic and therefore turns red litmus blue.

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Similar questions

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

(a) ammonium sulphate

(b) sodium acetate

(d) potassium carbonate

Identify the odd one out and justify.

(a) Chloride, nitrate, hydride, ammonium

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

(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. A student requires hard water for an experiment in his laboratory which is not available in the neighbouring area. In the laboratory there are some salts, which when dissolved in distilled water can convert it into hard water. Select from the following groups of salts, which when dissolved in distilled water will make it hard.
(a) Sodium chloride, Potassium chloride
(b) Sodium sulphate, Potassium sulphate
(c) Sodium sulphate, Calcium sulphate
(d) Calcium sulphate, Magnesium chloride

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?

Select from the following group of these salts which may be dissolved in water to make it hard.

(I) Sodium chloride
(II) Sodium sulphate
(III) Calcium chloride
(IV) Calcium sulphate
(V) Potassium chloride
(VI) Magnesium sulphate

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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

(d) Potassium carbonate Potassium carbonate ( K2CO3) is formed from a weak acid, carbonic acid (H2CO3), and a strong base, potassium hydroxide (KOH). On hydrolysis, K2CO3 forms more OH− ions than H+ ions. Thus, it is basic and therefore turns red litmus blue.

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