NEET UG CHEMISTRY MCQ: CO-ORDINATION COMPOUNDS

1 Easy

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Analyzing +4 | -1

Assertion : On cooling a freezing mixture, colour of the mixture turns to pink from deep blue for a reaction.

{Co}\left({H}_2 {O}\right)_6^{2+}{ }_{(a q)}+4 {Cl}_{(a q)}^{-} \rightleftharpoons

{CoCl}_4^{2-}(a q)+6 {H}_2 {O}_{(l)}

.

Reason : Reaction is endothermic so on cooling, the reaction moves to backward direction.

View answer and explanation

Correct option: A

If both assertion and reason are true and the reason is the correct explanation of the assertion.

The correct answer is A because the reaction is endothermic, and according to Le Chatelier's principle, cooling favors the reverse reaction, shifting the equilibrium towards the reactants and changing the color from blue to pink.

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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]