Assertion :The magnetic moment of $M g$ -atom is more than $K$ -atom as the former has two electrons in outermost shell. Reason: The magnetic moment of $N$ -atom is more than magnetic moment of $O$ -atom and former has more number of unpaired electrons.

Assertion is correct but Reason is wrong.

No worries! We‘ve got your back. Try BYJU‘S free classes today!

Assertion is wrong but Reason is correct.

Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.

No worries! We‘ve got your back. Try BYJU‘S free classes today!

Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.

No worries! We‘ve got your back. Try BYJU‘S free classes today!

Open in App

Solution

The correct option is B Assertion is wrong but Reason is correct.
Magnetic moment depends upon number of unpaired electrons and given by
$= \sqrt{n (n + 2)}$
Here, n is the number of unpaired electrons.
Hence, The magnetic moment of N-atom (3 unpaired electrons) is more than magnetic moment of O-atom (2 unpaired electrons ) and former has more number of unpaired electrons.
Thus reason is correct.
The magnetic moment of Mg-atom (0 unpaired electrons) is less than K-atom 91 unpaired electron).
Thus, the assertion is incorrect.

Suggest Corrections

Similar questions

Q. Assertion : Two electrons of helium atom are placed in only one shell but three electrons of lithium need two shells.
Reason: A shell can have maximum

{2n}^{2}

electrons.

In the following questions a statement of assertion (A) followed by a statement of reason (R) is given. Choose the correct answer out of the following choices.
(a) Assertion and reason both are true, reason is correct explanation of assertion.
(b) Assertion and reason both are true but reason is not the correct explanation of assertion.
(c) Assertion is true, reason is false.
(d) Assertion is false, reason is true.

Assertion (A) $[F e (C N)_{6}]^{3 -}$ ion shows magnetic moment corresponding to two unpaired electrons.
Reason (R) Because it has $d^{2} s p^{3}$ type hybridisation.

Assertion (A) p-nitrophenol is more acidic than phenol.
Reason (R) Nitro group helps in the stabilisation of the phenoxide ion by dispersal of negative charge due to resonance.
(a) Assertion and reason both are correct and reason is correct explanation of assertion.
(b) Assertion and reason both are wrong statements.
(c) Assertion is correct statement but reason is wrong statement.
(d) Assertion is wrong statement but reason is correct statement.
(e) Both assertion and reason are correct statements but reason is not correct explanation of assertion.

Assertion (A) o-nitrophenol is less soluble in water than the m- and p-isomers.
Reason (R) m and p-nitrophenols exist as associated molecules.
(a) Assertion and reason both are correct and reason is correct explanation of assertion.
(b) Assertion and reason both are wrong statements.
(c) Assertion is correct statement but reason is wrong statement.
(d) Assertion is wrong statement but reason is correct statement.
(e) Both assertion and reason are correct statements but reason is not correct explanation of assertion.

Assertion (A) Bond angle in ethers is slightly less than the tetrahedral angle.
Reason (R) There is a repulsion between the two bulky (- R) groups.
(a) Assertion and reason both are correct and reason is correct explanation of assertion.
(b) Assertion and reason both are wrong statements.
(c) Assertion is correct statement but reason is wrong statement.
(d) Assertion is wrong statement but reason is correct statement.
(e) Both assertion and reason are correct statements but reason is not correct explanation of assertion.

Join BYJU'S Learning Program

Assertion :The magnetic moment of Mg-atom is more than K-atom as the former has two electrons in outermost shell. Reason: The magnetic moment of N-atom is more than magnetic moment of O-atom and former has more number of unpaired electrons.

Assertion :The magnetic moment of $M g$ -atom is more than $K$ -atom as the former has two electrons in outermost shell. Reason: The magnetic moment of $N$ -atom is more than magnetic moment of $O$ -atom and former has more number of unpaired electrons.