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Byju's Answer

Standard XII

Physics

Current Loop Is a Magnet?

Which of the ...

Question

Which of the following pair will have effective magnetic moment equal?

C r^{+ 3}

and

M n^{+ 2}

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C r^{+ 2}

and

F e^{+ 2}

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V^{+ 2}

and

S c^{+ 3}

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T i^{+ 2}

and

V^{+ 2}

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Solution

The correct option is D $C r^{+ 2}$ and $F e^{+ 2}$
As we know,

magnetic moment $μ = \sqrt{n (n + 2)}$

n = no of unpaired electron.

$C r^{+ 2} 3 d^{4}$ : 4 unpaired electrons
$F e^{+ 2} 3 d^{6}$ : 4 unpaired electrons

As they have same no of unpaired electron, so they have same magnetic moment.

Suggest Corrections

Similar questions

Q. Which of the following arrangments does not represent the correct order of the property stated against it?
(1)

V^{2 +} < C r^{2 +} < M n^{2} < F e^{2 +}

: paramagnetic behaviour
(2)

N i^{2 +} < C o^{2 +} < F e^{2 +} < M n^{2 +}

: ionic size
(3)

C o^{3 +} < F e^{3 +} < C r^{3 +} < S c^{3 +}

: stability in aqueous solution
(4)

S c < T i < C r < M n

: number of oxidation states

Q. For

M^{2 +} / M

and

M^{3 +} / M^{2 +}

systems the

E^{\circ}

values for some metals are as follows:

$C r^{2 +} / C r$	$- 0.9 V$	$C r^{3 +} / C r^{2 +}$	$- 0.4 V$
$M n^{2 +} / M n$	$- 1.2 V$	$M n^{3 +} / M n^{2 +}$	$+ 1.5 V$
$F e^{2 +} / F e$	$- 0.4 V$	$F e^{3 +} / F e^{2 +}$	$+ 0.8 V$

Choose the correct statements:

Q. Statement 1: The number of unpaired electrons in the following ions:

M n^{2 +}, C r^{3 +}, V^{3 +}

and

T i^{3 +}

are 5, 3, 2 and 1 respectively.
Statement 2:

V^{3 +}

has a magnetic moment

(8)^{\frac{1}{2}} B M

For M²⁺/M and M³⁺/M²⁺systems, the values for some metals are as follows:

Cr²⁺/Cr −0.9V

Cr³/Cr²⁺ −0.4 V

Mn²⁺/Mn −1.2V

Mn³⁺ /Mn²⁺ +1.5 V

Fe²⁺ /Fe −0.4V

Fe³⁺/Fe²⁺ +0.8 V

Use this data to comment upon:

(i) The stability of Fe³⁺ in acid solution as compared to that of Cr³⁺ or Mn³⁺and

(ii) The ease with which iron can be oxidised as compared to a similar process for either chromium or manganese metal.

Q. Magnetic moments of

M^{2 +}

ions (divalent cations ) of 3d-series in the decreasing order is :

Z n^{2 +} > S c^{2 +} = C u^{2 +} > T i^{2 +} = N i^{2 +} > V^{2 +} = C o^{2 +} > C r^{2 +} = F e^{2 +} > M n^{2 +}

Is the above statement true?

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Which of the following pair will have effective magnetic moment equal?

The correct option is D Cr+2 and Fe+2As we know,magnetic moment μ=√n(n+2)n = no of unpaired electron. Cr+23d4 : 4 unpaired electronsFe+23d6 : 4 unpaired electronsAs they have same no of unpaired electron, so they have same magnetic moment.