Q.

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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a

XCl

b

XCl2

c

None of the above 

d

X2Cl2

answer is C.

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Detailed Solution

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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 XCl2.
The chemical formula of the oxide is XO and atomic number of the element X is 12 . This means that, the element X is magnesium metal. Therefore, the number of valence electrons present in the element X is 2 and its valency is +2. As valency of chlorine is -1, the formula for chloride of element X is XCl2.
  
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