Question No:1

The complex ion which has no ‘d’ electrons in the central metal atom is:

[A] [Co(NH₃)₆] ³⁺
[B] [Fe(CN) ₆] ^3–
[C] [Cr(H₂O) ₆] ³⁺
[D] [MnO₄] ^–



Question No:2

Oxidation number of Fe in violet coloured complex Na₄ [Fe(CN)₅(NOS) is:

[A] 0
[B] 2
[C] 3
[D] 4



Question No:3

Complexes [Co(NH₃)₅SO₄]Br and [Co(NH₃)₅Br]SO₄can be distinguished by

[A] conductance measurement
[B] using BaCl₂
[C] using AgNO₃
[D] all



Question No:4

Amongst the following ions, which one has the highest paramagnetism?

[A] [Cr(H₂O) ₆] ³⁺
[B] [Fe(H₂ O) ₆] ²⁺
[C] [Zn(H₂O) ₆] ²⁺
[D] [Cu(H₂O) ₆] ²⁺



Question No:5

Ni(CO)₄and [Ni(NH₃)₄]²⁺ do not differ in

[A] magnetic moment
[B] (C) geometry
[C] (B) oxidation number of Ni
[D] EAN



Question No:6

Which of the following statements is not correct?

[A] Ti(NO₃)₄is a colourless compound
[B] [Cr(NH₃)₆)]Cl₃is a coloured compound
[C] K₃[VF₆] is a colourless compound
[D] [Cu(NCCH₃)₄]BF₄ is a colourless compound



Question No:7

The geometry of Ni(CO)₄and [Ni(P Ph₃)₂Cl₂] are

[A] both square planar
[B] tetrahedral and square planar
[C] both tetrahedral
[D] square planar and tetrahedral



Question No:8

Of the following which is diamagnetic in nature?

[A] [CoF₆ ] ^3–
[B] [NiCl ₄] ^2–
[C] [CuCl ₄] ^2–
[D] [Ni(CN) ₄] ^2–



Question No:9

The [Fe(CN)₆]^3– complex ion

[A] exhibits planar geometry
[B] (C) should be very stable
[C] (B) is diamagnetic
[D] has 2 unpaired electrons



Question No:10

50 ml of 0.2 M solution of a compound with empirical formula CoCl₃.4NH₃on treatment with excess of AgNO₃(aq) yields 1.435 g of AgCl. Ammonia is not removed by treatment with concentrated H₂SO₄.The formula of the compound is:

[A] Co(NH₃)₄Cl₃
[B] [Co(NH₃)₄Cl₂]Cl
[C] [Co(NH₃)₄Cl₃
[D] [CoCl₃(NH₃)]NH₃



Question No:11

In the process of extraction of gold,
Roasted gold ore +CN ^– + H₂O (\x right arrow{o₂} [x] + OH ^– [x] + Zn —> [y] + Au [x] and [y] are:

[A] [x] = [Au(CN) ₂] ^– , [y] = [Zn(CN) ₄] ^2–
[B] [x] = [Au(CN) ₄] ^3–, [y] = [Zn(CN) ₄ ] ^2–
[C] [x] = [Au(CN) ₂] ^–, [y] = [Zn(CN) ₆] ^4–
[D] [x] = [Au(CN) ₄ ] ^–, [y] = [Zn(CN) ₄] ^2–



Question No:12

Which of the following is non–conducting?

[A] CoCl₃.6NH₃
[B] CoCl₃.5NH₃
[C] CoCl₃.4NH₃
[D] CoCl₃.3NH₃



Question No:13

Aqueous solution of FeSO₄gives tests for both Fe²⁺ and SO ^2-₄ but after addition of excess of KCN, solution ceases to give test for Fe²⁺.This is due to the formation of

[A] the double salt FeSO₄.2KCN.6H₂O
[B] Fe(CN)₃]^3–
[C] the complex ion [Fe(CN) ₆] ^4–
[D] the complex ion [Fe(CN) ₆]^3-



Question No:14

Which of the following statement(s) is/are correct with reference to Fe²⁺ and Fe³⁺ ions?
Fe³⁺ gives brown colour with potassium ferricyanide
Fe²⁺ gives blue colour with potassium ferricyanide
Fe³⁺ gives red colour with potassium thiocyanate
Fe²⁺ gives brown colour with ammonium thiocyanate

[A] 1, 2
[B] 1, 4
[C] 1, 2, 3
[D] all of these



Question No:15

The number of sigma bonds in Ziese’s salt is:

[A] 4
[B] 6
[C] 8
[D] none of these