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BSCHE 123

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Chemistry

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Dec 17, 2024

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1 / 6CBSE Test Paper-02Class - 12 Chemistry (Coordination Compounds)1. The isomers [(C6H5)3P2Pd(SCN)2] and [(C6H5)3P2Pd(NCS)2] showa. Linkage isomerismb. Coordination isomerismc. Geometrical isomerismd. Ionization isomerism2. According to Werner’s theory, the secondary valences of the central atom correspondto itsa. Chargeb. Oxidation numberc. Effective atomic numberd. Coordination number3. Which of the following complexes can form d and l isomers?a. Trans - [Co(en)2Cl2]+b. [Co(NH3)3Cl3]c. Cis - [ Co(en)2Cl2]+d. [Co(NH3)4Cl2]+4. Sodium pentacyanonitrosylferrate(II) is also calleda. Sodium ferrocyanideb. Sodium sulphocyanidec. Sodium nitroprussided. Sodium cobaltnitrite5. The oxidation state of Ag in tollen’s reagent isa. +2b. 0c. +1d. +1.56. Write formula for triamminediaquachlorocobalt (III) Chloride.

2 / 67. What is the IUPAC name of [Co(en)3]Cl3.8. Give examples of complexes ina. Chemical analysisb. Industries9. What is the difference between a double salt and a complex? Explain with anexample.10. What is the basis of formation of spectro-chemical series?11. Write IUPAC names of the following coordination compounds:a. K3[Cr(C2O4)3]b. Hg[Co(SCN)4]c. [Co(NH3)5(CO3)]Cl12. Using the valence bond approach, deduce the shape and magnetic character of[Cr(CO)6] [At. No. of Cr = 24]13. What will be the correct order for the wavelengths of absorption in the stable regionfor the following:[Ni(NO2)6]4-, [Ni(NH3)6]2+, [Ni(H2O)6]2-14. Give evidence that [Co(NH3)5Cl]SO4and [Co(NH3)5SO4]Cl are ionization isomers.15. Give the oxidation state, d-orbital occupation and coordination number of the centralmetal ion in the following complexes:i.ii. cisiii.iv.

3 / 6CBSE Test Paper-02Class - 12 Chemistry (Coordination Compounds)Solutions1. (a) Linkage isomerismExplanation:SCN-is an ambidentate ligand i.e it can bind through two differentdonor atoms, either through S in SCN-or through N in NCS-. So it shows linkageisomerism which arises when an ambidentate ligand is present in the complex.2. (d) Coordination numberExplanation:According to Werner’s theory, secondary valences are non-ionisableand are satisfied by neutral molecules or negative ions. Secondary valence is equal tothe coordination number and is fixed for a metal.3. (c) Cis - [ Co(en)2Cl2]+Explanation:Cis - [Co(en)2Cl2]+has non superimposable mirror images as shown.Hence, it shows optical isomerism and can form d (dextrorotatory) and l(laevorotatory) isomers.4. (c) Sodium nitroprussideExplanation:Na2[Fe(CN)5NO] i.e. Sodium pentacyanonitrosylferrate(II) is also calledSodium nitroprusside.5. (c) +1Explanation:Tollen's reagent contains diamminesilver(I) complex. So oxidationstate of Ag in tollen’s reagent is +1.6. [Co(NH3)3(H2O)2Cl]Cl27. Tris (ethylenediamine) Cobalt (III) Chloride

4 / 68.a. Chemical analysis – Qualitative and Quantitative analysis methods involve use ofLigands like EDTA, DMG etc.b. Industries - Hydrogenation of alkenes is done by using a sodium complex calledWilkinson catalyst. In black and white photography, silver complexes are used.9. Double salts dissociate completely into simple ions when dissolved in water e.g., Mohrsalt, FeSO4(NH4)2SO4. 6H2O will dissolve in water and give ferrous, ammonium andsulphate ions. On the other hand, the complex ions do not completely dissociate intoall constituent ions e.g K4[Fe(CN)6] will dissociate to give potassium ions and[Fe(CN)6]4-ions only.10.Spectrochemical series:The arrangements of ligands in order of their increasingfield strength, i.e. increasing crystal field splitting energy (CFSE) value is calledspectrochemical series.Crystal field splitting energy is the basis of formation of the spectrochemical series.11.a. Potassium trioxalato electromate IIIb. Mercuric tetrathiiocyanatocobaltate IIIc. Pentaamminecarbonatocobalt (III) chloride.12. Cr (24) Electronic configuration [Ar]4s13d5Oxidation state of Cr = 0In [Cr(CO)6] has electronic configuration [Ar] 4s03d5because CO will cause passing ofelectrons as it is a strong field ligand.

5 / 613. As metal ion is fixed, the increasing field strengths (CFSE) values of the ligands formthe spectrochemical series are in orderH2O< NH3<NO2-Thus, the energies absorbed for excitation will be in the order[Ni(H2O)6]2+< [Ni(NH3)6]2+< [Ni(NO2)6]4-The order of wavelength absorbed will be opposite of it.Since,14. When ionization isomers are dissolved in water, they ionize to give different ions.These ions then react differently with different reagents to give different products.[CO(NH3)5Cl]SO4+ Ba2+[CO(NH3)5Cl]SO4+ Ag+No reaction[CO(NH3)5SO4]Cl + Ba2+No reaction[CO(NH3)5SO4]Cl + Ag+15.i.The central metal ion is Co.Its coordination number is 6.The oxidation state can be given as:x – 6 = –3x = + 3The d orbital occupation forii. cis-The central metal ion is Cr.The coordination number is 6.The oxidation state can be given as:x + 2(0) + 2(–1) = +1x – 2 = +1x = +3The d orbital occupation foris.iii.

6 / 6The central metal ion is Co.The coordination number is 4.The oxidation state can be given as:x – 4 = –2x = + 2The d orbital occupation for.iv.The central metal ion is Mn.The coordination number is 6.The oxidation state can be given as:x + 0 = +2x = +2The d orbital occupation for Mn is