Q.

Assertion (A): Atomic radius of Ga is less than that of Al
Reason (R): The presence of 10 d-electrons offer poor screening effect for the outer electrons from the increased nuclear charge in gallium

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a

A and R are true ‘R’ explains A
 

b

A and R are true ‘R’ does not explains A
 

c

Both are false

d

A is false ‘R’ is true
 

answer is A.

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Detailed Solution

Atomic radius of Ga is less than that of Al. The presence of 10 d-electrons offer poor screening effect for the outer electrons from the increased nuclear charge in gallium

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