Assertion :In complex $[C r (N H_{3})_{4} B r C l] C l$ , the 'spin only' magnetic moment is close to 1.73 B.M. Reason: All known mononuclear complexes of chromium(III), irrespective of the strength of the ligand field, must have three unpaired electrons.

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!

Assertion is correct but Reason is incorrect

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

Assertion is incorrect but Reason is correct

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

Open in App

Solution

The correct option is D Assertion is incorrect but Reason is correct
Chromium(III) ion has $3 d^{3}$ outer electronic configuration. It contains three unpaired electrons. This is irrespective of the strength of the ligand. The magnetic moment corresponding to three unpaired electrons is $\sqrt{3 (3 + 2)} = \sqrt{15} = 3.83$ .

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.

Assertion (A) Rate constant determined from Arrhenius equation are fairly accurate for simple as well as complex molecules.

Reason (R) Reactant molecules undergo chemical change irrespective of their orientation during collision.

(a) Both assertion and reason are correct and the reason is correct explanation of assertion
(b) Both assertion and reason are correct, but reason does not explain assertion.
(c) Assertion is correct, but reason is incorrect
(d) Both assertion and reason are incorrect
(e) Assertion is incorrect but reason is correct.

Q. Assertion: The compressibility factor for

H_{2}

and

H e

(1 + \frac{P b}{R T})

Reason: The compressibility factor for

H_{2}

and

H e

can be derived from Van der Waal's equation.

Assertion: All the points (1, 0), (-1, 0), (2, 0) and (5, 0) lie on the x – axis.
Reason: Equation of the x-axis is y = 0

Choose the correct option.

Assertion (A) All collision of reactant molecules lead to product formation.

Reason (R) Only those collisions in which molecules have correct orientation and sufficient kinetic energy lead to compound formation.

Join BYJU'S Learning Program

Assertion :In complex [Cr(NH3)4BrCl]Cl, the 'spin only' magnetic moment is close to 1.73 B.M. Reason: All known mononuclear complexes of chromium(III), irrespective of the strength of the ligand field, must have three unpaired electrons.

Assertion :In complex $[C r (N H_{3})_{4} B r C l] C l$ , the 'spin only' magnetic moment is close to 1.73 B.M. Reason: All known mononuclear complexes of chromium(III), irrespective of the strength of the ligand field, must have three unpaired electrons.