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Directions : In the following questions,...

Directions : In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as :
Assertion (A) : Be and Al show some similar properties.
Reason (R) : The metallic radius of Be is less than the metallic radius of Al.

A

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

B

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

C

A is true but R is false.

D

A is false and R is true.

Text Solution

Verified by Experts

The correct Answer is:
B
Be and Alshow diagonal relationship because Be resembles in its properties with Al. Metallic radius of the Be (111 pm) is less than the metallic radius of Al (143 pm). Although smaller size is the reason for the anomalous behaviour of Be but not a reason for its diagonal relation with AI.
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