Direction for: In each of the following questions a statement of Assertion is given followed by a corresponding statement of Reason just below it. Of the statements mark the correct answer as
Assertion: \[Al\] and \[Ga\] have nearly same atomic radii. Reason: \[Al\] and \[Ga\] show diagonal relationship.A) If both Assertion: and Reason: are true and the Reason: is the correct explanation of the Assertion:
B) If both Assertion: and Reason: are true but the Reason: is not the correct explanation of the Assertion:
C) If Assertion: is true but Reason: is false
D) If both Assertion: and Reason: are false
Correct Answer: C
Solution :
Al and Ga both belong to 13 group. In general, on moving down a group atomic radii increases. But this is not true here because of the poor shielding of electrons in Ga. Thus, Al and Ga have almost same atomic radii. Hence, Reason: is false.
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