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  • In the following question, a statement of assertion is followed by a statement of reason.Select the correct option: Assertion: Electronegativity first increases from B

In the following question, a statement of assertion is followed by a statement of reason.Select the correct option:

Assertion: Electronegativity first increases from B to Al and then decreases from Al to Tl.

Reason: Due to poor shielding by inner d and f electrons.

Option: 1

Both assertion and reason are true and reason is the correct explanation of assertion.


Option: 2

Both assertion and reason are true but reason is not the correct explanation of assertion.


Option: 3

Assertion is fase but reason is true.

 


Option: 4

Both assertion and reason are false.


Answers (1)

best_answer

Correct option is (3)

Electronegativity first decreases from B to Al and then increases from Al to Tl and this is due to poor shielding by inner d and f electrons. Group 13 elements are more electronegative than group 1 (alkali metals) and group 2 (alkaline earth metals). Group 13 elements show a wide range of variations in their properties. Group 13 elements and their ions also have smaller size than the corresponding group 2 elements because of the increase in nuclear charge.

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