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Q.

Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R).

Assertion (A) : Metallic character decreases and non-metallic character increases on moving from left to right in a period.

Reason (R): It is due to increase in ionisation enthalpy and decrease in electron gain enthalpy, when one moves from left to right in a period.

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a

 (A) is false but (R) is true

b

Both (A) and (R) are correct but (R) is not the correct explanation of (A)

c

(A) is true but (R) is false

d

Both (A) and (R) are correct and (R) is the correct explanation of (A).

answer is C.

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Detailed Solution

Moving from left to right, metallic character declines, and non-metallic character increases; this is caused by an increase in ionisation enthalpy. However, the enthalpy of electron gain similarly rises from left to right. The reason is in error.

Hence, the required option is C.

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Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R).Assertion (A) : Metallic character decreases and non-metallic character increases on moving from left to right in a period.Reason (R): It is due to increase in ionisation enthalpy and decrease in electron gain enthalpy, when one moves from left to right in a period.