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Byju's Answer
Standard XII
Chemistry
Moseley's Law
Assertion :Th...
Question

Assertion :The atomic radii of the elements of oxygen family are smaller than the atomic radii of corresponding elements of the nitrogen family. Reason: The members of oxygen family are more electronegative and thus have lower value of nuclear charge than those of the nitrogen family.

A
Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
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B
Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
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C
Assertion is correct but Reason is incorrect
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D
Both Assertion and Reason are incorrect
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Solution

The correct option is B Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
Atomic radii of the elements of oxygen family are smaller than nitrogen family because along the group increase in electronegative nature of element overweighs the increase in atomic number thereby decreasing the size of element as we go left to right.

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Q. Read the assertion and reason carefully to mark the correct option out of the options given below:

(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 reason is not the correct explanation of the assertion.

(c)If assertion is true but reason is false.

(d)If assertion is false but reason is true.
Assertion: Ionisation enthalpies for early actinoids are lower than that for early lanthanoids.
Reason: 5f electrons more effectively shielded from the nuclear charge than the 4f electrons
of the corresponding lanthanoids.
Q. Read the assertion and reason carefully to mark the correct option out of the options given below:
(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 reason is not the correct explanation of the assertion.
(c) If assertion is true but reason is false.
(d) If assertion and reason both are false.

Assertion : HOF bond angle is greater than HOCl bond angle.
Reason : Oxygen is more electronegative than halogens
Q. Assertion : Two electrons of helium atom are placed in only one shell but three electrons of lithium need two shells.
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