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Standard X

Chemistry

Amphoteric Metals Reaction

Hot concentra...

Question

Hot concentrated ___ must be added to aluminium hydroxide to obtain potassium aluminate.

iron sulphate

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potassium hydroxide

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magnesium chloride

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potassium chloride

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Solution

The correct option is B potassium hydroxide
Aluminium hydroxide reacts with hot concentrated alkalis to form salt and water. Here, aluminium hydroxide reacts with hot concentrated potassium hydroxide to give potassium aluminate ( $K A l O_{2}$ ) and water, as shown below:

$A l (O H)_{3} + K O H (h o t c o n c .)$ $\to$ $K A l O_{2} + 2 H_{2} O$

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Similar questions

When hot concentrated potassium hydroxide is added to lead, potassium oxide is obtained as the major product and hydrogen gas is liberated in the process.

Translate the following statements into chemical equations and then balance them.

(a) Hydrogen gas combines with nitrogen to form ammonia.

(b) Hydrogen sulphide gas burns in air to give water and sulphur dioxide.

(d) Potassium metal reacts with water to give potassium hydroxide and hydrogen gas.

Write the balanced chemical equations of the following reactions.

(a) Sodium hydroxide + sulphuric acid $\to$ sodium sulphate + water

(b) Potassium bicarbonate + sulphuric acid $\to$ potassium sulphate + carbon dioxide + water

(d) Chlorine + sulphur dioxide + water $\to$ sulphuric acid + hydrogen chloride

(e) Silver nitrate $\to$ silver + nitrogen dioxide + oxygen

(f) Copper + nitric acid $\to$ copper nitrate + nitric oxide + water

(g) Ammonia + oxygen $\to$ nitric oxide + water

(h) Barium chloride + sulphuric acid $\to$ barium sulphate + hydrochloric acid

(i) Zinc sulphide + oxygen $\to$ zinc oxide + sulphur dioxide

(j) Aluminium carbide + water $\to$ aluminium hydroxide + methane

(k) Iron pyrites ( $F e S_{2}$ ) + oxygen $\to$ ferric oxide + sulphur dioxide

(l) Potassium permanganate + hydrochloric acid $\to$ potassium chloride + manganese chloride + chlorine + water

(m) Aluminium sulphate + sodium hydroxide $\to$ sodium sulphate + sodium meta aluminate + water.

(n) Aluminium + sodium hydroxide + water $\to$ sodium meta aluminate + hydrogen

(o) Potassium dichromate + sulphuric acid $\to$ potassium chloride + chromium chloride + water + chlorine.

(p) Sulphur + nitric acid $\to$ sulphuric acid + nitrogen dioxide + water.

(q) Sodium chloride + manganese dioxide + sulphuric acid $\to$ sodium hydrogen sulphate + manganese sulphate + water + chlorine.

Q. Write balanced chemical equations for the following reactions:
(i) A mixture of potassium dichromate and sodium chloride is heated with concentrated

H_{2} {S O}_{4}

.
(ii) Aqueous solution of sodium nitrate is heated with zinc dust and caustic soda solution.
(iii) Sodium iodate is added to a solution of sodium bisulphite.
(iv) Iron reacts with cold dilute nitric acid.
(v) Potassium permanganate is added to a hot solution of manganous sulphate.

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Hot concentrated ___ must be added to aluminium hydroxide to obtain potassium aluminate.

The correct option is B potassium hydroxideAluminium hydroxide reacts with hot concentrated alkalis to form salt and water. Here, aluminium hydroxide reacts with hot concentrated potassium hydroxide to give potassium aluminate (KAlO2) and water, as shown below: Al(OH)3+KOH(hot conc.)→KAlO2+2H2O