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Question

A metal (M) forms an oxide with the formula M2O. What will be the formula of its chloride?

A
MCl2
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B
MCl
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C
M2Cl
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D
M2Cl3
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Solution

The correct option is B MCl
According to the given chemical formula of the oxide, M2O, 2 atoms of a metal M combine with 1 atom of oxygen. As the valency of oxygen is two, hence, the valency of the metal M would be one.
Now, the valency of Cl is 1. Thus, the chemical formula of the chloride of metal M is MCl.

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