JEE Main 2019 — Chemistry Inorganic Chemistry

2019mcqmedium

The incorrect statement is.

Official previous-year question

Held on 10 Apr 2019 · Verified 6 Jul 2026.

Options

A
The spin-only magnetic moments of ${[Fe{({H}_{2}O)}_{6}]}^{2+}$ and ${[Cr{({H}_{2}O)}_{6}]}^{2+}$ are nearly similar.
B
The spin-only magnetic moment of ${[Ni{(N{H}_{3})}_{4}{({H}_{2}O)}_{2}]}^{2+}$ is $2.83 BM.$
C
The gemstone, ruby, has $C{r}^{3+}$ ions occupying the octahedral sites of beryl.
D
The color of ${[CoCl{(N{H}_{3})}_{5}]}^{2+}$ is violet as it absorbs the yellow light.

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Solution

$(A) {[Fe{({H}_{2}O)}_{6}]}^{2+}, F{e}^{2+}\rightarrow 3{d}^{6}\rightarrow 4$ unpaired electron

${[Cr{({H}_{2}O)}_{6}]}^{2+}, C{r}^{2+}\rightarrow 3{d}^{4}\rightarrow 4$ unpaired electron

$(B) {[Ni{(N{H}_{3})}_{4}{({H}_{2}O)}_{2}]}^{2+}=N{i}^{2+}\rightarrow 3{d}^{8}$

$\rightarrow 2$ unpaired electron

${\mu }_{m}=2.83 B.M$

$(C)$ In gemstone, ruby has $C{r}^{3+}$ ion occupying the octahedral sites of aluminium oxide $(A{l}_{2}{O}_{3})$ normally occupied by $A{l}^{3+}$ ion.

$(D)$ Complimentary color of violet is yellow.

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JEE Main Inorganic Chemistry in other years

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JEE Main 2019 — Chemistry Inorganic Chemistry

2019mcqmedium

The incorrect statement is.

Official previous-year question

Held on 10 Apr 2019 · Verified 6 Jul 2026.

Options

A
The spin-only magnetic moments of ${[Fe{({H}_{2}O)}_{6}]}^{2+}$ and ${[Cr{({H}_{2}O)}_{6}]}^{2+}$ are nearly similar.
B
The spin-only magnetic moment of ${[Ni{(N{H}_{3})}_{4}{({H}_{2}O)}_{2}]}^{2+}$ is $2.83 BM.$
C
The gemstone, ruby, has $C{r}^{3+}$ ions occupying the octahedral sites of beryl.
D
The color of ${[CoCl{(N{H}_{3})}_{5}]}^{2+}$ is violet as it absorbs the yellow light.

Did you get this right?

Solution

$(A) {[Fe{({H}_{2}O)}_{6}]}^{2+}, F{e}^{2+}\rightarrow 3{d}^{6}\rightarrow 4$ unpaired electron

${[Cr{({H}_{2}O)}_{6}]}^{2+}, C{r}^{2+}\rightarrow 3{d}^{4}\rightarrow 4$ unpaired electron

$(B) {[Ni{(N{H}_{3})}_{4}{({H}_{2}O)}_{2}]}^{2+}=N{i}^{2+}\rightarrow 3{d}^{8}$

$\rightarrow 2$ unpaired electron

${\mu }_{m}=2.83 B.M$

$(C)$ In gemstone, ruby has $C{r}^{3+}$ ion occupying the octahedral sites of aluminium oxide $(A{l}_{2}{O}_{3})$ normally occupied by $A{l}^{3+}$ ion.

$(D)$ Complimentary color of violet is yellow.

Your note

JEE Main Inorganic Chemistry in other years

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JEE Main 2019 — Chemistry Inorganic Chemistry

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Solution

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JEE Main Inorganic Chemistry in other years

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JEE Main 2019 — Chemistry Inorganic Chemistry

Options

Did you get this right?

Solution

Your note

JEE Main Inorganic Chemistry in other years

More JEE Main Inorganic Chemistry questions

Other Chemistry topics for JEE Main

Physical Chemistry

Organic Chemistry

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