Chemistry · JEE

Important Questions: Colour and magnetic properties for JEE

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The most important Colour and magnetic properties questions for JEE cover conceptual traps, standard results, and numerical patterns from Colour and magnetic properties. Goodmarks provides 6+ high-yield MCQs with full solutions.

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Syllabus context

Part of Coordination Compounds in JEE Main Chemistry.

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Q1ChemistryUnit 12: Coordination Compounds

The calculated spin-only magnetic moments (BM) of the anionic and cationic species of

\left[\boldsymbol{F} e\left(\boldsymbol{H}_{2} \boldsymbol{O}\right)_{6}\right]_{2}

and

\left[\boldsymbol{F e}(\boldsymbol{C} \boldsymbol{N})_{\mathbf{6}}\right],

respectively, are:

Q2ChemistryUnit 12: Coordination Compounds

Which of the following options are correct regarding the complex

\left[\boldsymbol{F} \boldsymbol{e}(\boldsymbol{C} \boldsymbol{N})_{\boldsymbol{6}}\right]^{\boldsymbol{3}-} \operatorname{and}\left[\boldsymbol{F} \boldsymbol{e}(\boldsymbol{C} \boldsymbol{N})_{\boldsymbol{6}}\right]^{\boldsymbol{4}-}

This question has multiple correct options

Q3ChemistryUnit 12: Coordination Compounds

Select the correct statements amount the following: 1. Complexes

\left[\boldsymbol{C u}\left(\boldsymbol{N} \boldsymbol{H}_{3}\right)_{4}\right]^{2+},\left[\boldsymbol{M} \boldsymbol{n} \boldsymbol{C l}_{4}\right]^{2+},\left[\boldsymbol{F} \boldsymbol{e}(\boldsymbol{C} \boldsymbol{N})_{6}\right]

are all paramagnetic 2. Complexes

\left[\boldsymbol{C u}\left(\boldsymbol{N} \boldsymbol{H}_{3} \boldsymbol{4}\right)\right]^{2+},\left[\boldsymbol{N} \boldsymbol{i}(\boldsymbol{C} \boldsymbol{N})_{4}\right]^{2-},[\boldsymbol{N} \boldsymbol{i}(\boldsymbol{D} \boldsymbol{M}

are all square planner 3. The correct stability order of the complexes will be

\left[\boldsymbol{F e}\left(\boldsymbol{H}_{2} \boldsymbol{O}\right)_{3}\right]^{3+}<

\left[\boldsymbol{F e}\left(\boldsymbol{C}_{2} \boldsymbol{O}_{3}\right)\right]^{3-}<\left[\boldsymbol{F} \boldsymbol{e}(\boldsymbol{C} \boldsymbol{N})_{3}\right]^{3-}

\left[\boldsymbol{C r}(\boldsymbol{e n})_{3}\right]^{3+}

exist in the three isometric forms

Q4ChemistryUnit 12: Coordination Compounds

The incorrect statement(s) among the following is (are): ¡) Primary valency of a transition metal ion in complex represent its oxidation number. ii)

Z n^{2+}

is colourless. iii)

M n C l_{2}

exhibits green color in aqueous solution. iv)

F e, C o, N i

complexes are diamagnetic in nature.

Q5ChemistryUnit 12: Coordination Compounds

In nitroprusside ion, the iron and NO exist as

\mathrm{Fe}^{+2}

and

\mathrm{NO}^{+}

, instead of

\mathrm{Fe}^{+3}

and NO. The given conclusion can be drawn by:

Q6ChemistryUnit 12: Coordination Compounds

In aqueous solution,

\left[\boldsymbol{C o}\left(\boldsymbol{H}_{2} \boldsymbol{O}\right)_{6}\right]^{2+}(\boldsymbol{X})

reacts with molecular oxygen in the presence of excess liquor

N H_{3}

to give a new complex

Y

. The number of unpaired electrons in

X

and

Y

are, respectively.

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Important questions test core concepts that appear frequently across JEE Main and Advanced papers — definitions, standard formulas, and classic problem types.

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