Q1. In the following redox reaction with
an equilibrium constant K = 2.0 x 108,
The
self-exchange rates for oxidant and reductant are 5.0 M-1 s-1
and 4.0 x 103 M-1 s-1, respectively. The
approximate rate constant (M-1 s-1) for the reaction is
[NET Dec 2016]
(a) 3.16 x 106
(b) 2.0 x 106
(c) 6.32 x 106
(d) 3.16 x 104
Q2. For OH- catalyzed SN1
conjugate base mechanism of [Co(NH3)5Cl]2+,
the species obtained in the first step of the reaction is/are
[NET Dec 2016]
(a) [Co (NH3)5 OH]2+
+ Cl-
(b) [Co (NH3)4 (NH2)
Cl]+ + H2O
(c) [Co (NH3)4 (NH2)
Cl]2+ + Cl-
(d) [Co (NH3)5 Cl
(OH)]+ only
Q3. In the hydrolysis of trans- [Co(en)2Cl(A)]+,
if the leaving group is chloride, the formation of cis product is the least,
when A is
(a) NO2-
(b) NCS-
(c) Cl-
(d) OH-
Q4. Predict the products of the following
reactions:
[TIFR 2016]
[Pt(PPh3)4]2+
+ 2Cl- → X
[PtCl4]2- + 2 PPh3
→ Y
(a) X = trans- [PtCl2 (PPh3)2]
and Y = cis- [PtCl2 (PPh3)2]
(b) X = cis- [PtCl2 (PPh3)2]
and Y = trans- [PtCl2 (PPh3)2]
(c) X = Y = cis- [PtCl2 (PPh3)2]
(d) X = Y = trans- [PtCl2 (PPh3)2]
Q5. Aqueous Cr2+ effects on
electron reduction of [Co(NH3)5Cl]2+ giving
compound Y. Compound Y undergoes rapid hydrolysis. Y is
[NET Dec 2015]
(a) [Co(NH3)5]2+
(b) [Co(NH3)5(OH)]+
(c) [Co(NH3)4(OH)2]
(d) [Co(H2O)5Cl]2+
Q6. The correct statement about the
substitution reaction of [Co(CN)5Cl]3- with OH-
to give [Co(CN)5OH]3- is
[NET Dec 2015]
(a) it obeys first order kinetics
(b) its rate is proportional to the
concentration of both the reactants
(c) it follows the SN1CB
mechanism
(d) its rate is dependent only on the
concentration of [OH]-
Q7. The mechanism of the reaction between
[Fe(CN)6]4- and [Fe(bpy)3]3+ (bpy =
2, 2’-bipyridine) is:
[GATE 2010]
(a) outer sphere electron transfer
(b) inner sphere electron transfer
(c) self-exchange reaction
(d) ligand exchange followed by electron
transfer
Q8. The one CO group is replaced by PPh3
in [Cr(CO)6], which one of the following statements is TRUE?
[GATE 2015]
(a) The Cr-C bond length increases and CO
bond length decreases
(b) The Cr-C bond length decreases and CO
bond length decreases
(c) The Cr-C bond length decreases and CO
bond length increases
(d) The Cr-C bond length increases and CO
bond length increases
Q9. The potential energy PE versus
reaction coordinate diagrams for electron transfer reactions with rate
constants k1, k2 and k3 are given below. The
increasing order of rate constants is
[GATE 2015]
(a) k2 < k3 <
k1
(b) k2 < k1 <
k3
(c) k3 < k2 <
k1
(d) k3 < k1 <
k2
Q10. Identify X in the reaction [Pt(NH3)4]2+
+ 2 HCl → X
(a) cis- [PtCl2(NH3)2]
(b) trans- [PtCl2(NH3)2]
(c) [PtCl(NH3)3]+
(d) [PtCl3(NH3)]-
1.b 2.b 3.a 4.b 5.a 6.a 7.c 8.c 9.d 10.b