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Standard X
Chemistry
Concentration of Aluminium Ore
Aluminium oxi...
Question

Aluminium oxide reacts with hot concentrated solution of sodium hydroxide to form:


A

sodium aluminate

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B

aluminous hydroxide

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C

aluminium hydride

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D

sodium aluminate hydroxide

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Solution

The correct option is A

sodium aluminate


Aluminium oxide reacts with hot concentrated solution of sodium hydroxide to form sodium aluminate. The reaction involved is:

Al2O3.2H2O(s)+2NaOH(aq)→2NaAlO2(aq)+3H2O(l)

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Q. Give equations for the following conversions:
(i) Ferric oxide to iron
(ii) Aluminium hydroxide to aluminium oxide
(iii) Aluminium to aluminium nitride
(iv) Aluminium to sodium aluminate
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.
Q.

Write the balanced chemical equations of the following reactions.

(a) Sodium hydroxide + sulphuric acid → sodium sulphate + water

(b) Potassium bicarbonate + sulphuric acid → potassium sulphate + carbon dioxide + water

(c) Iron + sulphuric acid → ferrous sulphate + hydrogen.

(d) Chlorine + sulphur dioxide + water → sulphuric acid + hydrogen chloride

(e) Silver nitrate → silver + nitrogen dioxide + oxygen

(f) Copper + nitric acid → copper nitrate + nitric oxide + water

(g) Ammonia + oxygen → nitric oxide + water

(h) Barium chloride + sulphuric acid → barium sulphate + hydrochloric acid

(i) Zinc sulphide + oxygen → zinc oxide + sulphur dioxide

(j) Aluminium carbide + water → aluminium hydroxide + methane

(k) Iron pyrites (FeS2) + oxygen → ferric oxide + sulphur dioxide

(l) Potassium permanganate + hydrochloric acid → potassium chloride + manganese chloride + chlorine + water

(m) Aluminium sulphate + sodium hydroxide → sodium sulphate + sodium meta aluminate + water.

(n) Aluminium + sodium hydroxide + water → sodium meta aluminate + hydrogen

(o) Potassium dichromate + sulphuric acid → potassium chloride + chromium chloride + water + chlorine.

(p) Sulphur + nitric acid → sulphuric acid + nitrogen dioxide + water.

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

Q.

Aluminium oxide reacts with hot concentrated solution of sodium hydroxide to form:


Q. Aluminium + sodium hydroxide + water = sodium meta aluminate + hydrogen
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