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Q.

Given below are two statements: One is labeled as
Assertion A and the other is labelled as Reason R :
Assertion A : The first ionisation enthalpy decreases across a period
Reason R : The increasing nuclear charge outweighs the shielding across the period
In the light of the above statements, choose the most appropriate from the options given below: 

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a

A is false but R is true

b

A is true but R is false

c

Both A and R are true but R is NOT the correct explanation of A

d

Both A and R are true and R is the correct explanation of A 

answer is C.

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Detailed Solution

First ionisation energy increases along the period ‘Z’ increases which out weights the shielding effect

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