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‘X’ is a brown-colored metal. When metal is exposed to moist air, the tarnishing of metal ‘X’ takes place. During the tarnishing of metal. Which of
the following reaction takes
i) $2 X + O_{2} \to 2 X O$                     ii) $X O + C O_{2} \to X C O_{3}$
iii) $X O + H_{2} O \to X {(O H)}_{2}$         iv) $X O + H_{2} O \to X + H_{2} O$

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Only ii and iii are taking place

i, ii, iii take place

ii, iii, iv take place

only iv will takes place

answer is B.

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Detailed Solution

i) During tarnishing Cu react with oxygen to form black copper oxide

ii) CuO react with $C O_{2}$ to form $C u C O_{3}$

iii) CuO react with $H_{2} O$ to form $C u {(O H)}_{2}$ .

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