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

Oxidation State
MCQs for CSIR NET & GATE

Coordination Compounds
Topic wise Assignment 1

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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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