The ‘black rust’ on silver is _________.

Silver bicarbonate

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Silver sulphide

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Silver oxide

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Silver carbonate

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Silver hydroxide

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Solution

The correct option is A
Silver bicarbonate

Silver when exposed to air reacts with sulphur oxides in air to form silver sulphides which is black in colour. Sulphur and nitrogen dioxide and trioxide gases present in the air act as pollutants and react with the surface of silver to form black compounds such as silver nitrate and silver sulphide.

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Similar questions

Q. Which among the following statement(s) is/are true?
Exposure of silver of silver chloride to sunlight for a long duration turns grey due to:
(1) Formation of silver by decomposition of silver chloride.
(2) Sublimation of silver chloride
(3) Decomposition of chlorine gas from silver chloride
(4) Oxidation of silver chloride

Which among the following statement(s) is/are true? Exposure of silver chloride to sunlight for a long duration turns grey due to:

(i) the formation of silver by decomposition of silver chloride

(ii) sublimation of silver chloride

(iii) decomposition of chlorine gas from silver chloride

(iv) oxidation of silver chloride

Q. Assertion (A): Silver chloride is always kept in a dark coloured bottle.
Reason (R): Photolytic decomposition of silver chloride occurs in the presence of light.

Question 8

Which among the following statement(s) is (are) true?

Exposure of silver chloride to sunlight for a long duration turns grey due to:

(i) the formation of silver by decomposition of silver chloride.
(ii) sublimation of silver chloride.
(iii) decomposition of chlorine gas from silver chloride.
(iv) oxidation of silver chloride.

(a) (i) only
(b) (i) and (iii)
(c) (ii) and (iii)
(d) (iv) only

Is formation of silver chloride by the combination reaction of silver and chlorine a endothermic reaction?

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