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CBSE 12th Standard Chemistry Subject Coordination Compounds Ncert Exemplar 2 Mark Questions With Solution 2021

Published on: 25/05/2021

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Std: 12th Standard CBSE - Chemistry

chapter: - NCERT Exemplers

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Questions:

Generic 2

3 x 2 = 6

A complex of the type [M(AA)₂X₂]ⁿ⁺ is known to be optically active. What does this indicate about the structure of the complex ? Give one example of such complex.

Arrange the following complex in the increasing order of conductivity of their solution :
\([Co(NH_3)_3Cl_3],\ [Co(NH_3)_4Cl_2]\ Cl,\ [Co(NH_3)_6]\ Cl_3,\ [Cr(NH_3)_5Cl]\ Cl_2.\)

\(\)

CoSO₄Cl. 5NH₃ exists in ywo isomeric forms 'A' and 'B' . Isomer 'A' reacts with AgNO₃ to give white precipitate, but does not react with BaCl₂. Isomer 'B' gives white precipitate with BaCl₂ but does not react with AgNO₃. Answer the following questions.
(i) Identify 'A' and 'B' and write their structural formulae.
(ii) Name the type of isomerism involved.
(iii) Give the IUPAC name of 'A' and 'B'.

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Answers Key:

Generic 2

3 x 2 = 6

An optically active complex of the type \([M(AA)_2X_2]^{n+}\) indicates cis-octahedral structure, e.g., cis- \([Pt(en)_2Cl_2]^{2+}\ or\ cis-[Cr(en)_2Cl_2]^+\)

\([Co(NH_3)_3Cl_3]<[Cr(NH_3)_5Cl]\ Cl<\ [Co(NH_3)_5 Cl]\ Cl_2<[Co(NH_3)_6]\ Cl_3\)
This is the order because ions produced are 0, 2, 3 and 4 respectively.

\((i)\ \left[ Co{ \left( { NH }_{ 3 } \right) }_{ 5 }{ SO }_{ 4 } \right] Cl+{ AgNO }_{ 3 }(aq)\longrightarrow AgCl(s)+\left[ Co{ \left( { NH }_{ 3 } \right) }{ SO }_{ 4 } \right] { NO }_{ 3 }\\ \quad \quad \quad \quad \quad \quad \quad \quad \quad 'A'\quad \ \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad white\ ppt\)
\( \left[ Co{ \left( { NH }_{ 3 } \right) }_{ 5 }Cl \right] { SO }_{ 4 }+{ BaCl }_{ 2 }\longrightarrow { BaSO }_{ 4 }(s)+\left[ Co{ \left( { NH }_{ 3 } \right) }_{ 5 }Cl \right] { Cl }_{ 2 }\\ \quad \quad \quad \quad \quad \quad \quad \quad \quad 'B'\quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad white\ ppt\)
(ii) Ionisation isomerism
(iii) 'N' is pentaamrnine chloridocobalt(III) sulphate.
'B' is pentaammine sulphatocobalt(III) chloride.