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Q.

Given below are two statements: One is labelled as Assertion A and other is labelled as Reason R :

Assertion (A): Helium has the highest value of ionization energy among all the elements known.
Reason(B) : Helium has the highest value of electron affinity among all the elements known. 

In the light of the above statements, choose the correct answer from the options given below :

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a

if both A and R are false

b

if A is true but R is false.

c

if both A and R are true but R is NOT correct explanation of A

d

if both A and R is true and R is correct explanation of A

answer is C.

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Detailed Solution

He contains fully filled 1s2 orbital which has more penetrating effect and is very close to the nucleus and hence has highest value of ionization energy. Chlorine has highest electron affinity amongst all the elements known, not helium. 

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Given below are two statements: One is labelled as Assertion A and other is labelled as Reason R :Assertion (A): Helium has the highest value of ionization energy among all the elements known.Reason(B) : Helium has the highest value of electron affinity among all the elements known. In the light of the above statements, choose the correct answer from the options given below :