| Direction: Assertion- Reason type each of these contains two statements: Statements I (Assertion), Statement II (Reason). Each of these questions also has four alternative choices. Only one of which is correct. You have to select the correct choices from the codes [a], [b], [c] and [d] given below: |
| Statement I: The atomic radii of the elements of the oxygen family are smaller than the atomic radii of the corresponding elements of the nitrogen family. |
| Statement II: The members of the oxygen family are more electronegative and thus, have lower values of nuclear charge than those of the nitrogen family. |
A) Statements is true; Statement II is true; Statements II is not the correct explanation for Statements I.
B) Statement I is true; Statement II is false.
C) Statement I is false; Statement II is true.
D) Statement I is true; Statement II is true; Statement II is the correct explanation for Statement I.
Correct Answer: B
Solution :
In a period, on moving from left to right, the number of shells remain constant but number of electrons increases ie, effective nuclear charge (z) increases. atomic radii \[\propto \frac{1}{z}\] Thus, atomic radii of elements of VI group are smaller than the atomic radii of corresponding elements of group V.
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