JEE Main 2022 — Chemistry Inorganic Chemistry

2022integerhard

The spin-only magnetic moment value of an octahedral complex among ${\mathrm{CoCl}}_{3}\cdot 4{\mathrm{NH}}_{3}$ , ${\mathrm{NiCl}}_{2}\cdot 6{H}_{2}O$ and ${\mathrm{PtCl}}_{4}\cdot 2\mathrm{HCl}$ , which upon reaction with excess of ${\mathrm{AgNO}}_{3}$ gives $2$ moles of $\mathrm{AgCl}$ is_____B.M. (Nearest Integer)

Official previous-year question

Held on 26 Jun 2022 · Verified 6 Jul 2026.

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Solution

(I) ${H}_{2}[{\mathrm{PtCl}}_{6}]\rightarrow$ no ppt with ${\mathrm{AgNO}}_{3}$

${\mathrm{Pt}}^{+4},\mathrm{CN}=6$

(II) $[\mathrm{Ni}{({H}_{2}O)}_{6}]{\mathrm{Cl}}_{2}\frac{{\mathrm{AgNO}}_{3}}{\mathrm{excess}}2$ mole of $\mathrm{AgCl}\downarrow$ ,

${\mathrm{Ni}}^{+2},\mathrm{CN}=6,n=2,{\mu }_{m}=\sqrt{n(n+2)}\mathrm{BM}=\sqrt{8}=2.82\mathrm{BM}\simeq 3$

Aqua complexes, generally have $\mathrm{CN}=6$

(III) $[{\mathrm{CoCl}}_{2}{({\mathrm{NH}}_{3})}_{4}]\mathrm{Cl}\underset{\mathrm{excess}}{\overset{{\mathrm{AgNO}}_{3}}{\longrightarrow }}1$ Mole of $\mathrm{AgCl}\downarrow$ ,

${\mathrm{Co}}^{+3},\mathrm{CN}=6$

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JEE Main 2022 — Chemistry Inorganic Chemistry

2022integerhard

Official previous-year question

Held on 26 Jun 2022 · Verified 6 Jul 2026.

Did you get this right?

Solution

(I) ${H}_{2}[{\mathrm{PtCl}}_{6}]\rightarrow$ no ppt with ${\mathrm{AgNO}}_{3}$

${\mathrm{Pt}}^{+4},\mathrm{CN}=6$

(II) $[\mathrm{Ni}{({H}_{2}O)}_{6}]{\mathrm{Cl}}_{2}\frac{{\mathrm{AgNO}}_{3}}{\mathrm{excess}}2$ mole of $\mathrm{AgCl}\downarrow$ ,

${\mathrm{Ni}}^{+2},\mathrm{CN}=6,n=2,{\mu }_{m}=\sqrt{n(n+2)}\mathrm{BM}=\sqrt{8}=2.82\mathrm{BM}\simeq 3$

Aqua complexes, generally have $\mathrm{CN}=6$

(III) $[{\mathrm{CoCl}}_{2}{({\mathrm{NH}}_{3})}_{4}]\mathrm{Cl}\underset{\mathrm{excess}}{\overset{{\mathrm{AgNO}}_{3}}{\longrightarrow }}1$ Mole of $\mathrm{AgCl}\downarrow$ ,

${\mathrm{Co}}^{+3},\mathrm{CN}=6$

Your note

JEE Main Inorganic Chemistry in other years

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JEE Main 2022 — Chemistry Inorganic Chemistry

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JEE Main Inorganic Chemistry in other years

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JEE Main 2022 — Chemistry Inorganic Chemistry

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Solution

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JEE Main Inorganic Chemistry in other years

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Other Chemistry topics for JEE Main

Physical Chemistry

Organic Chemistry

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