Assertion: Magnetic moment of Mn2+ is less than that of Cr2+. Reason: Higher the atomic number smaller is the magnetic moment.

Question

Assertion: Magnetic moment of Mn2+ is less than that of Cr2+. Reason: Higher the atomic number smaller is the magnetic moment. (A) If both assertion and reason are true and reason is the correct explanation of assertion (B) If both assertion and reason are true but reason is not the correct explanation of assertion (C) If assertion is true but reason is false (D) If both assertion and reason are false

Tardigrade Admin · Accepted Answer

The magnetic moment is determined by number of unpaired electrons and is calculated by using the formula,

μ = n (n + 2)

where n is number of unpaired electrons.
It increases with increase in number of unpaired electrons hence

M n^{2 +}

will have higher magnetic moment than

C r^{2 +}

.

Q. Assertion : Magnetic moment of Mn2+ is less than that of Cr2+. Reason : Higher the atomic number smaller is the magnetic moment.

If both assertion and reason are true and reason is the correct explanation of assertion

If both assertion and reason are true but reason is not the correct explanation of assertion

If assertion is true but reason is false

If both assertion and reason are false

The magnetic moment is determined by number of unpaired electrons and is calculated by using the formula, μ=n(n+2)​ where n is number of unpaired electrons. It increases with increase in number of unpaired electrons hence Mn2+ will have higher magnetic moment than Cr2+.

Q. Assertion : Magnetic moment of $M n^{2 +}$ is less than that of $C r^{2 +}$ .
Reason : Higher the atomic number smaller is the magnetic moment.

The magnetic moment is determined by number of unpaired electrons and is calculated by using the formula, $μ = n (n + 2)$ where n is number of unpaired electrons.
It increases with increase in number of unpaired electrons hence $M n^{2 +}$ will have higher magnetic moment than $C r^{2 +}$ .