UPSC  Chemistry

1. A solution containing 2.675 g of CoCl3 · 6NH3 (molar mass = 267.5 g mol–1) is passed through a cation exchanger. The chloride ions obtained in solution were treated with excess of AgNO3 to give 4.78 g of agcl (molar mass = 143.5 g mol–1). The formula of the complex is
(At. Mass of Ag = 108 u)

[Co(NH3)6]Cl3 [CoCl2(NH3)4]Cl [CoCl3(NH3)3] [CoCl(NH3)5]Cl2

2. Excess of silver nitrate solution is added to 100 ml of 0.01 M Pentaaqua chloro chromium (III) chloride solution. The mass of silver chloride obtained in grams is
[atomic mass of silver is 108].

287 × 10–3 143.5 × 10–3 143.5 × 10–2 287 × 10–2

3. Geometrical shapes of the complexes formed by the reaction of Ni2+ with Cl–, CN– and H2O, respectively are

Octahedral, tetrahedral and square planar Tetrahedral, square planar and octahedral Square planar, tetrahedral and octahedral Octahedral, square planar and octahedral

4. nickel (Z = 28) combines with a uninegative monodentate ligand X– to form a paramagnetic complex [NiX4]2–. The number of unpaired electron(s) in the nickel and geometry of this complex ion are, respectively

one, tetrahedral two, tetrahedral one, square planar two, square planar

5. The correct statement with respect to the complexes Ni(CO)4 and [Ni(CN)4]2– is

nickel is in the same oxidation state in both both have tetrahedral geometry both have square planar geometry have tetrahedral and square planar geometry respectively

6. The pair of compounds having metals in their highest oxidation state is

MnO2, FeCl3 [MnO4]–, CrO2Cl2 [Fe(CN)6]3–, [Co(CN)3] [NiCl4]2–, [CoCl4]–

7. The value of the ‘spin only’ magnetic moment for one of the following configurations is 2.84 BM. The correct one is

d4 (in strong ligand filed) d4 (in weak ligand field) d3 (in weak as well as in strong fields) d5 (in strong ligand field)

8. When EDTA solution is added to Mg2+ ion solution, then which of the following statements is not true?

four coordinate sites of Mg2+ are occupied by EDTA and remaining two sites are occupied by water molecules All six coordinate sites of Mg2+ are occupied pH of the solution is decreased Colorless [Mg–EDTA]2– chelate is formed

9. Which of the following facts about the complex [Cr(NH3)6]Cl3 is wrong?

The complex gives white precipitate with silver nitrate solution The complex involves d2sp3 hybridization and is octahedral in shape The complex is paramagnetic The complex is an outer orbital complex

10. Which of the following pairs represents linkage isomers?

[Pd(P Ph3)2 (NCS)2] and [Pd(P Ph3)2(SCN)2] [Co (NH3)5 NO3]SO4 and [Co(NH3)5SO4] NO3 [Pt Cl2(NH3)4]Br2 and [PtBr2(NH3)4]Cl2 [Cu(NH3)4] [PtCl4] and [Pt(NH3)4] [CuCl4]

 

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