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An element $X$ with atomic number $12$ combines with oxygen to form an oxide $XO$ . If the oxide is electrically conducting then, the chemical formula of the compound formed by $X$ with chlorine is:

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XCl

X {Cl}_{2}

None of the above

X_{2} {Cl}_{2}

answer is C.

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Detailed Solution

An element

X

with atomic number

12

combines with oxygen to form an oxide

XO

. If the oxide is electrically conducting then, the chemical formula of the compound formed by

X

with chlorine is

XC l_{2}

.
The chemical formula of the oxide is

XO

and atomic number of the element

X

12

. This means that, the element

X

is magnesium metal. Therefore, the number of valence electrons present in the element

X

2

and its valency is

+ 2

. As valency of chlorine is

- 1

, the formula for chloride of element

X

XC l_{2}

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