Multiple Choice Questionswhich of the following does not show optical isomerism? (en = ethylenediamine)
[Co(en)2Cl2]+
[Co(NH3)3Cl3]0
[Co(en)Cl2(NH3)2]+
[Co(en)Cl2(NH3)2]+
Al2O3 is reduced by electrolysis at low potentials and high currents. If 4.5 x 104 An of current is passed through molten Al2O3 for 6h, what mass of aluminium is produced? (Assume 100% current efficiency, at.mass of Al = 27 g mol-1)
9.0 x 103 g
8.1 x 104 g
2.4 x 105 g
2.4 x 105 g
which of the following complex ions is expected to absorb visible light?
(At. no.Zn = 30, Sc = 21, Ti = 22, Cr = 24)
[Sc(H2O)(NH3)3]3+
[Ti(en)2(NH3)2]4+
[Cr(NH3)6]3+
[Cr(NH3)6]3+
D.
[Cr(NH3)6]3+
only those transition metal complexes are expected to absorb visible light, in which d-subshell is incomplete (ie, has unpaired electron) and excitation of an electron from a lower energy orbital to higher energy orbital is possible.
a) In [Sc(H2O)(NH3)3]3+ Sc is present in Sc3+ = [Ar]3d0,4s0
since in this complex excitation of the electron is not possible, it will not absorb visible light.
b) In [Ti(en)2(NH3)2]4+,Ti is present as Ti4+.
Ti4+ = [Ar] 3d0,4s0
Hence it will not absorb visible light.
c) In [Cr(NH3)6]3+ ,Cr is present as Cr3+
Cr3+ = [Ar]3d3,4s0
Since this complex has three unpaired electrons, excitation of electrons is possible and thus, it is expected that this complex will absorb visible light.
d) In [Zn(NH3)6]2+, Zn is present Zn2+
Zn2+ = [Ar] 3d10, 4s0
Hence, this complex will not absorb visible light.
Half-life period of a first order reaction is 1386 s. The specific rate constant of the reaction is
5.0 x 10-3s-1
0.5 x 10-2 s-1
0.5 x 10-3 s-1
0.5 x 10-3 s-1
Copper crystallises in a face-centered cubic lattice with a unit cell length of 361 pm. What is the radius of copper atom in pm?
128
157
181
108
For the reaction, A+B → Products, it is observed that
1) On doubling the initial concentration of A only, the rate of reaction is also doubled and
2) On doubling the initial concentrations of both A and B , there is a change by a factor of 8 in the rate of the reaction.
The rate of this reaction is, given by
rate = k [A]2[B]
rate = k[A][B]2
rate = k[A]2[B]2
rate = k[A]2[B]2
The equivalent conductance of M/32 solution of weak monobasic acid is 8.0 ohm-cm2 and at infinite dilution is 400 ohm-cm2. The dissociation constant of this acid is
1.25 x 10-5
1.25 x 10-6
6.25 x 10-4
6.25 x 10-4
Given,
(i) Cu2+ + 2e- → Cu, Eo = 0.337 V
(ii) Cu2+ +e- → Cu+, Eo = 0.153
Electrode potential, Eo for the reaction,
Cu +e- →Cu, will be
0.52 V
0.90 V
0.30 V
0.30 V
What is the [OH-] in the final solution prepared by mixing 20.0 mL of 0.50 M HCl with 30.0mL of 0.10 Ba(OH)2?
0.10 M
0.40 M
0.0050 M
0.0050 M
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