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Question

An element X on exposure to moist air turns reddish-brown and a new compound Y is formed. The substance X and Y are:


A

X = Fe, Y = Fe2O3

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B

X = Ag, Y = Ag2S

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C

X = Cu, Y = CuO

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D

X = Al, Y = Al2O3

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Solution

The correct option is A

X = Fe, Y = Fe2O3


Explanation for the correct option:

(A) The exposure of element X to moist air forms a reddish-brown Y.

The reddish-brown compound is known as rust Fe2O3

4Fe(s)(Iron)+xH2O(l)(Water)+3O2(g)(Oxygen)2Fe2O3.xH2O(s)Iron(III)oxide

Therefore, X = Fe and Y = Fe2O3

Explanation for the incorrect options:

(B) Silver (Ag) reacts with Sulphur (S) present in the air to form Silver sulphide (Ag2S) which is black in colour.

(C) Copper (Cu) reacts with moist air along with Carbon dioxide (CO2) to form a green layer of Copper carbonate (CuCO3) and Copper hydroxide [Cu(OH)2]

(D) Aluminium (Al) reacts with air to form a white layer of Aluminium oxide (Al2O3).

Hence, option (A) is correct.


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