Q.

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

Assertion (A): Lithium and beryllium unlike their other respective group members form compounds with pronounced ionic character.

Reason (R): Lithium and Magnesium have similar properties due to diagonal relationship.

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

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a

(A) is true but (R) is false

b

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

c

(A) is not true but (R) is true

d

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

answer is B.

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Detailed Solution

Lithium is the first element of group 1 and beryllium is the fi rst element of group 2.
They have small size and high polarizing power, due to which they are more prone to form covalent compound.
Lithum amd magnesium have diagonal relationship, due to which they share similar properties such as forming nitrides when treated with nitrogen, electronegativity value of (Li = 1.0 and for Mg = 1.2) etc.

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