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Standard X

Chemistry

Amphoteric Metals Reaction

What happens ...

Question

What happens when aluminium reacts with boiling dil. NaOH?

Aluminium hydroxide and hydrogen is formed.

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Aluminium hydroxide and water is formed.

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Sodium meta aluminate and water is formed.

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Sodium meta aluminate and hydrogen is formed.

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Solution

The correct option is C. Sodium meta aluminate and hydrogen is formed.
Aluminium reacts with boiling and dilute NaOH to form sodium meta aluminate and liberate hydrogen gas.

$2 A l (s) + 2 N a O H (a q) + 2 H_{2} O (l) \to 2 N a A l O_{2} (a q) + 3 H_{2} (g)$
NOTE:
If NaOH is taken in the excess form it forms a coordination complex.

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Similar questions

What happens when sodium meta aluminate is diluted with water?

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. When bauxite is boiled with aqueous

N a O H

solution, sodium metal aluminate solution is formed. This part in the metallurgy of aluminium is called:

Write a balanced chemical equation for each of the following :

1. Carbon disulphide burns in air to give carbon dioxide and sulphur dioxide.

2. Calcium hydride reacts with water to form calcium hydroxide and hydrogen gas.

3. Methyl alcohol burns in air to form carbon dioxide and water.

4. Liquid hydrogen peroxide decomposes to give water and oxygen gas.

5. Aluminium hydroxide reacts with sulphuric acid to give ammonium sulphate and water.

6. Aluminium sulphate solution reacts with sodium hydroxide to form a precipitate of aluminium hydroxide.

Q. Aluminium is prepared industrially by Hall-Heroult process. Various steps in the concentration of ore are given below . Write them in the correct order.
i. The precipitate formed is separated , washed and strongly heated to get alumina.
ii. Crushed bauxite is leached with hot sodium hydroxide solution.
iii. Impurities are removed from the sodium aluminate solution for filtration.
iv. Solution is diluted after adding a little aluminium hydroxide , to precipitate aluminium hydroxide.

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What happens when aluminium reacts with boiling dil. NaOH?

The correct option is C. Sodium meta aluminate and hydrogen is formed.Aluminium reacts with boiling and dilute NaOH to form sodium meta aluminate and liberate hydrogen gas. 2Al(s)+2NaOH(aq)+2H2O(l)→2NaAlO2(aq)+3H2(g)NOTE:If NaOH is taken in the excess form it forms a coordination complex.