Oxidation State (Coordination Compounds) MCQs for CSIR NET GATE - ChemContent

Vijay Ishwar
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Oxidation State
MCQs for CSIR NET & GATE

Coordination Compounds
Topic wise Assignment 1

Quiz          PDF

Q1. The complex formed in the brown ring test for nitrates is

[GATE 2002]
(a) [Fe(H2O)5NO]3+
(b) [Fe(H2O)5NO]2+
(c) [Fe(H2O)4(NO)2]2+
(d) [Fe(H2O)4(NO)2]3+

Q2. The structures of the complexes [Cu(NH3)4](ClO4)2 and [Cu(NH3)4](ClO4) in solution respectively are

[GATE 2007]
(a) Square planer and tetrahedral
(b) Octahedral and square pyramidal
(c) Octahedral and trigonal bipyramidal
(d) Tetrahedral and square planer

Q3. The oxidation number of Fe in Na2[Fe(CN)5NO] is
(a) +1
(b) +2
(c) +3
(d) +4

Q4. The molecular formula for tetraamminenickel(II)hexacyanoferrate(III) is?
(a) [Ni(NH3)4] [Fe(CN)6]
(b) [Ni(NH3)4]3 [Fe(CN)6]4
(c) [Ni(NH3)4] [Fe(CN)6]2
(d) [Ni(NH3)4]3 [Fe(CN)6]2

Q5. Which of the following can't act as a chelating agent?

[TIFR 2015]
(a) HC(CH2CH2NH2)3
(b) CH3NHCH2CH3
(c) N(CH2CH2NH2)3
(d) H2NCH2CH2CH2NH2

Q6. For Co in oxidation state= +2; what will be the overall charges on following complexes

[TIFR 2015]

(a) z = +2 ; x = -2 ; y = +2
(b) z = 0 ; x = +2 ; y = -2
(c) z = 0 ; x = +2 ; y = +2
(d) z = -2 ; x = +2 ; y = -2

Q7. The three dimensional structure of compound [Co(Co(NH3)4(OH)2)3]Br6 has

[NET Dec 2014]
(a) Twelve Co-O and Twelve Co-N bonds
(b) Ten Co-O and Ten Co-N bonds
(c) Fourteen Co-O and Ten Co-N bonds
(d) Twelve Co-O and Ten Co-N bonds

Q8. Among the following, species expected to show fluxional behavior are

[NET Dec 2015]
(A) [NiCl4]2-, Tetrahedral
(B) IF7 , Pentagonal Bipyramidal
(C) [CoF6]3- , Octahedral
(D) Fe(CO)5 , Trigonal Bipyramidal

(a) B and C
(b) B and D
(c) C and D
(d) A and D

Q9. In the following hexa-coordinated complexes
(I) CoCl3(NH3)6
(II) CoCl3(NH3)5
(III) CoCl3(NH3)4
If the number coordinated NH3 molecules in (I), (II) and (III) respectively are 6, 5 and 4 then the oxidation states of Cobalt in (I), (II) and (III) will respectively be

(a) +6, +5, +4
(b) +3, +2, +1
(c) 0, +1, +2
(d) +3, +3, +3

Q10. A complex is composed of one chromium ion, three bromides and six water molecules. Upon addition of excess AgNO3, 1.0 gram aqueous solution of the complex gave 0.94g of AgBr. The molecular formula of the complex is

[GATE 2019]
(a) [Cr(H2O)6]Br3
(b) [Cr(H2O)5Br]Br2.H2O
(c) [Cr(H2O)4Br2]Br.2H2O
(d) [Cr(H2O)3Br3].3H2O

Answer Key

Q1.b Q2.a Q3.b Q4.d Q5.b Q6.b Q7.a Q8.b Q9.d Q10.b

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