NEET UG CHEMISTRY MCQ: CO-ORDINATION COMPOUNDS

1 Hard

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Analyzing +4 | -1

Assertion : In a mixture of

{\text{Cd(II)}}

and

{\text{Cu(II)}}

{\text{(C}}{{\text{d}}^{ + 2}}{\text{)}}

gets precipitated in presence of

\mathrm{KCN}

by H2S.

Reason : The stability constant of

{\left[ {{\text{(Cu(CN}}{{\text{)}}_{\text{4}}}} \right]^{ - 3}}

is greater than

{\left[ {{\text{(Cu(CN}}{{\text{)}}_{\text{4}}}} \right]^{ - 2}}

View answer and explanation

Correct option: A

If both Assertion & Reason are True & the Reason is a correct explanation of the Assertion.

Option A is correct because in the presence of KCN, Cu(II) forms a stable complex, preventing its precipitation as CuS, while Cd(II) remains free to precipitate as CdS.

More Questions from CO-ORDINATION COMPOUNDS

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The complexes

\left[ {\mathrm{PtC}{\mathrm{l}_2}{{\left( {\mathrm{N}{\mathrm{H}_3}} \right)}_4}} \right]\mathrm{B}{\mathrm{r}_2}\mathrm{\;and\;}\left[ {\mathrm{PtB}{\mathrm{r}_2}{{\left( {\mathrm{N}{\mathrm{H}_3}} \right)}_4}} \right]\mathrm{C}{\mathrm{l}_2}\mathrm{\;}

are example for isomerism The total number of stereoisomers for the complex

\left[\mathrm{Cr}(\mathrm{Ox})_{2} \mathrm{ClBr}\right]^{3-}

(where

\text{ox =}

oxalate) is The value of

x

on the

{\left[ {\mathrm{Ni}{{\left( {\mathrm{CN}} \right)}_4}} \right]^x}

is: Excited state configuration of

\mathrm{M}{\mathrm{n}^{2 + }}

\mathrm{CuS}{\mathrm{O}_4}

decolourises on addition of KCN, the product is: The IUPAC name of

{\mathrm{K}_2}\left[ {\mathrm{Ni}{{\left( {\mathrm{CN}} \right)}_4}} \right]