Chemistry Paper VII Inorganic Chemistry Previous Year Question Paper Year 2005 : IIIrd Year

Q. 1. Fill in the blanks of any nine of the following :
(i) (Co(en)3|3+ shows……………………isomerism.
(ii) …………………..is an example of a substance that causes eutrophication.
(iii) CuSO4 is………………..(attracted/repelled) by magnetic field.
(iv) The main pollutant responsible for green-house effect is…………………..
(v) NO~2 is an example of……………………….(ambient/ bidentate) ligand.
(vi) NH4 Cl is…………………(more/less) soluble than NaCl in liquid ammonia.
(vii) The geometry of XeF6 is……………………….
(viii) According to valence bond theory, K4 [Fe(CN)6] is a …………………………(inner sphere/outer sphere) complex.
(ix) Number of peroxo groups in CrO5 is……………………..
(x)…………….. is an example of a fertilizer containing both nitrogen and clacium.
Answer :

Q.2. (a) Name the following complexes according to the FUPAC system:
(i) [Cu(NH3)4(en)]SO4
(ii) [Co(NH3)4(SCN)2]CI
(iii) [Co(NH3)3 Cl2 Br]

(iv) Image no.1

(b) Write the formulae of the following complexes:
(i) Triamminetrichlorocobalt(iii)
(ii) Tetrammineplatinum (II) tetrachloroplatinate (1I)
(iii) Tetraquadibromochromium (III) ion
(iv) Tetrakis (trifluorophosphine) nickel (II).
Answer :

Q. 3.’ (a) Write chemical equations for the reaction of:
(i) Sodium nitropruside with sodium sulphide
(ii) Potassium permanganate with hydrogen peroxide, under acidic conditions
(iii) Potassium ferricyanide with ferrous ions. 1×3
(b) Explain why transition metals show variable oxidation states.
(c ) What is the root cause of acid rain ? Highlight one of its consequences.
Answer :

Q. 4. (a) Explain the phenomenon responsible for colour of potassium dichromate.
(b) Describe the preparation of potassium permanganate.
(c ) Why do chromium and copper have unexpected configurations ?
(d) What happens when:
(i) XeF4 react with water?
(ii) XeF2 react with HCI?
Answer :

Q. 5. (a) Write self-ionization equations for liquid ammonia and liquid sulphur dioxide.

(b) Indicate the reaction of:
(i) PCI5 and SO2 in liquid sulphur dioxide solvent,
(ii) NaNH2 and ZnCl2 in liquid ammonia solvent. 2

(c ) Why do bidentate ligands more stable complexes than monodentate ones ?

(d) Give the postulates of Werner theory.
Answer :

Q. 6. (a) On the basis of valence bond theory, find out the number of unpaired electrons in [Cr(NH3)6]3+ and [Ni(NH3)6]2+complexes. 3

(b) Depict the stereoisomers of [Co(en)2Cl2]+ indicating the techniques used to distinguish these.

(c ) Give the preparation of superphosphate of lime.
Answer :

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