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Q.

The electronic configuration of X is (2,8,7) and of Y is (1). The nature of bond between X and Y is

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a

Metallic

b

Ionic

c

Covalent

d

Hydrogen 

answer is B.

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Detailed Solution

The electronic configuration of X is (2,8,7) and of Y is (1). The nature of the bond between X and Y is ionic.
The atom X with electronic configuration (2,8,7) is chlorine and atom Y with (1) is H. The bond formed between H and Cl is an ionic bond because hydrogen transfers its electron to chlorine atom. The formula of this compound is XY. For example the formation of ionic bond in HCl is shown as follows:
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