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Q.

Two elements X and Y have following electronic configurationsX: 1s22s22p63s23p64s2Y: 1s22s22p63s23p5The expected compound formed by combination of X and Y will be expressed as

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a

XY2

b

X5Y2

c

X2Y5

d

XY5

answer is A.

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Detailed Solution

Valency of element X is 2 (electrons in the outermost shell) while that of element Y is 1 (electron required in the outermost shell to complete octet). So, the formula of the compound between X and Y is XY2

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