CBSE 12th Standard Chemistry Subject Coordination Compounds Ncert Exemplar 2 Mark Questions With Solution 2021
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CBSE 12th Standard Chemistry Subject Coordination Compounds Ncert Exemplar 2 Mark Questions With Solution 2021
12th Standard CBSE
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Reg.No. :
Chemistry
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Why are different colours observed in octahedral and tetrahedral complexes for the same metal and same ligands?
(a) -
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'.(a) -
Arrange the following complex in the increasing order of conductivity of their solution :
\([Co(NH_3)_3Cl_3],\ [Co(NH_3)_4Cl_2]\ Cl,\ [Co(NH_3)_6]\ Cl_3,\ [Cr(NH_3)_5Cl]\ Cl_2.\)\(\)
(a) -
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.
(a)
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CBSE 12th Standard Chemistry Subject Coordination Compounds Ncert Exemplar 2 Mark Questions With Solution 2021 Answer Keys
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\({ \triangle }_{ t }=\frac { 4 }{ 9 } { \triangle }_{ o }\), so lower wavelength is absorbed in octahedral complex than tetrahedral complex for the same metal and ligand because its \({ \triangle }_{ o }\) is more than \({ \triangle }_{ t }\), therefore, colour is different.
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\((i)\ \left[ Co{ \left( { NH }_{ 3 } \right) }_{ 5 }{ SO }_{ 4 } \right] Cl+{ AgNO }_{ 3 }(aq)\longrightarrow AgCl(s)+\left[ Co{ \left( { NH }_{ 3 } \right) }{ SO }_{ 4 } \right] { NO }_{ 3 }\\ \quad \quad \quad \quad \quad \quad \quad \quad \quad 'A'\quad \ \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad white\ ppt\)
\( \left[ Co{ \left( { NH }_{ 3 } \right) }_{ 5 }Cl \right] { SO }_{ 4 }+{ BaCl }_{ 2 }\longrightarrow { BaSO }_{ 4 }(s)+\left[ Co{ \left( { NH }_{ 3 } \right) }_{ 5 }Cl \right] { Cl }_{ 2 }\\ \quad \quad \quad \quad \quad \quad \quad \quad \quad 'B'\quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad white\ ppt\)
(ii) Ionisation isomerism
(iii) 'N' is pentaamrnine chloridocobalt(III) sulphate.
'B' is pentaammine sulphatocobalt(III) chloride. -
\([Co(NH_3)_3Cl_3]<[Cr(NH_3)_5Cl]\ Cl<\ [Co(NH_3)_5 Cl]\ Cl_2<[Co(NH_3)_6]\ Cl_3\)
This is the order because ions produced are 0, 2, 3 and 4 respectively. -
An optically active complex of the type \([M(AA)_2X_2]^{n+}\) indicates cis-octahedral structure, e.g., cis- \([Pt(en)_2Cl_2]^{2+}\ or\ cis-[Cr(en)_2Cl_2]^+\)
