Aniline black is obtained by the action of aniline with:

sodium dichromate and sulphuric acid

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water

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conc. nitric acid

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conc. hydrochloric acid

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Solution

The correct option is A sodium dichromate and sulphuric acid
Aniline can be oxidized easily. Different oxidizing agents gives different products. Aniline black is obtained by reaction of potassium dichromate with acid solution. Aniline even undergoes oxidation when exposed to the air and as a result it takes on a dirty red-brown color.

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Similar questions

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

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(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

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(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.

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