Correct4
Incorrect-1
A square planar complex is formed by hybridisation of which atomic orbitals?
{tex} s , p _ { x } , p _ { y } , d _ { y z } {/tex}
{tex} \mathrm { s } , \mathrm { p } _ { \mathrm { x } } , \mathrm { p } _ { \mathrm { y } } , \mathrm { d } _ { \mathrm { x } ^ { 2 } - \mathrm { y } ^ { 2 }} {/tex}
{tex} \mathrm { s } , \mathrm { p } _ { \mathrm {x } } , \mathrm { p } _ { \mathrm { y } } , \mathrm { d } _ { \mathbf { z } } ^ { 2 } {/tex}
{tex} \mathrm { s } , \mathrm { p } _ { \mathrm { y } } , \mathrm { p } _ { \mathrm { z } } , \mathrm { d } _ { \mathrm { x y } } {/tex}
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The type of isomerism present in nitropentammine chromium (III) chloride is
optical
linkage
ionization
polymerisation.
Correct4
Incorrect-1
{tex} \mathrm { CH } _ { 3 } - \mathrm { Mg } - \mathrm { Br } {/tex} is an organo metallic compound due to
{tex} \mathrm { Mg } - \mathrm { Br } {/tex} bond
{tex} \mathrm { C } - \mathrm { Mg } {/tex} bond
{tex} \mathrm { C } - \mathrm { Br } {/tex} bond
{tex} \mathrm { C } - \mathrm { H } {/tex} bond
Correct4
Incorrect-1
Most common oxidation states of Ce (cerium) are
{tex} + 2 , + 3 {/tex}
{tex} + 2 , + 4 {/tex}
{tex} + 3 , + 4 {/tex}
{tex} + 3 , + 5 {/tex}
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Arrange {tex} \mathrm { Ce } ^ { + 3 } , \mathrm { La } ^ { + 3 } , \mathrm { Pm } ^ { + 3 } {/tex} and {tex} \mathrm { Yb } ^ { + 3 } {/tex} in increasing order of their ionic radii.
{tex} \mathrm { Yb } ^ { + 3 } < \mathrm { Pm } ^ { + 3 } < \mathrm { Ce } ^ { + 3 } < \mathrm { La } ^ { + 3 } {/tex}
{tex} \mathrm { Ce } ^ { + 3 } < \mathrm { Yb } ^ { + 3 } < \mathrm { Pm } ^ { + 3 } < \mathrm { La } ^ { + 3 } {/tex}
{tex} \mathrm { Yb } ^ { + 3 } < \mathrm { Pm } ^ { + 3 } < \mathrm { La } ^ { + 3 } < \mathrm { Ce } ^ { + 3 } {/tex}
{tex} \mathrm { Pm } ^ { + 3 } < \mathrm { La } ^ { + 3 } < \mathrm { Ce } ^ { + 3 } < \mathrm { Yb } ^ { + 3 } {/tex}
Correct4
Incorrect-1
Which of the following ions has the maximum magnetic moment?
{tex} \mathrm { Mn } ^ { + 2 } {/tex}
{tex} \mathrm { F } \mathrm { e } ^ { + 2 } {/tex}
{tex} \mathrm { Ti } ^ { + 2 } {/tex}
{tex} \mathrm { Cr } ^ { + 2 } {/tex}
Correct4
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The most stable ion is
{tex} \left[ \mathrm { Fe } \left( \mathrm { OH } _ { 3 } \right] ^ { 3- } \right. {/tex}
{tex} \left[ \mathrm { Fe } ( \mathrm { Cl } ) _ { 6 } \right] ^ { 3-} {/tex}
{tex} \left[ \mathrm { Fe } ( \mathrm { CN } ) _ { 6 } \right] ^ { 3- } {/tex}
{tex} \left[ \mathrm { Fe } \left( \mathrm { H } _ { 2 } \mathrm { O } \right) _ { 6 } \right] ^ { 3 + } {/tex}
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When {tex} \mathrm { KMnO } _ { 4 } {/tex} acts as an oxidising agent and ultimately forms {tex} \left[ \mathrm { MnO } _ { 4 } \right] ^ { - 2 } , \mathrm { MnO } _ { 2 } , \mathrm { Mn } _ { 2 } \mathrm { O } _ { 3 } , \mathrm { Mn } ^ { + 2 } {/tex} then the number of electrons transferred in each case respectively is
{tex} 4,3,1,5 {/tex}
{tex} 1,5,3,7 {/tex}
{tex} 1,3,4,5 {/tex}
{tex} 3,5,7,1 {/tex}
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The radius of {tex} \mathrm { La } ^ { 3 + } {/tex} (Atomic number of {tex} \mathrm { La } = 57 {/tex} ) is {tex}1.06 \mathrm {{\text Å}} {/tex} . Which one of the following given values will be closest to the radius of {tex} \mathrm { L } \mathrm { u } ^ { 3 + } {/tex} (Atomic number of {tex} \mathrm { L } \mathrm { u } = 71 {/tex} ) ?
{tex}1.40\, \mathrm {{\textÅ}} {/tex}
{tex} 1.06\mathrm { Å} {/tex}
{tex} 0.85\mathrm { Å } {/tex}
{tex} 1.60\mathrm { Å } {/tex}
Correct4
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Ammonia forms the complex ion {tex} \left[ \mathrm { Cu } \left( \mathrm { NH } _ { 3 } \right) _ { 4 } \right] ^ { 2 + } {/tex} with copper ions in alkaline solutions but not in acidic solutions. What is the reason for it?
In acidic solutions protons coordinate with ammonia molecules forming {tex} \mathrm { NH } _ { 4 } ^ { + } {/tex} ions and {tex} \mathrm { NH } _ { 3 } {/tex} molecules are not available
In alkaline solutions insoluble {tex} \mathrm { Cu } ( \mathrm { OH } ) _ { 2 } {/tex} is precipitated which is soluble in excess of any alkali
Copper hydroxide is an amphoteric substance
In acidic solutions hydration protects copper ions
Correct4
Incorrect-1
One mole of the complex compound {tex} \mathrm { Co } \left( \mathrm { NH } _ { 3 } \right) _ { 5 } \mathrm { Cl } _ { 3 } , {/tex} gives 3 moles of ions on dissolution in water. One mole of the same complex reacts with two moles of {tex} \mathrm { AgNO } _ { 3 } {/tex} solution to yield two moles of {tex} \mathrm { AgCl } {/tex} (s). The structure of the complex is
{tex} \left[ \mathrm { Co } \left( \mathrm { NH } _ { 3 } \right) _ { 3 } \mathrm { Cl } _ { 3 } \right] \cdot 2 \mathrm { NH } _ { 3 } {/tex}
{tex} \left.\left[ \mathrm { Co } \mathrm (NH _ { 3 } \right) _ { 4 } \mathrm { Cl } _ { 2 } \right] \mathrm { Cl } \cdot \mathrm { NH } _ { 3 } {/tex}
{tex} \left[ \mathrm { Co } \left( \mathrm { NH } _ { 3 } \right) _ { 4 } \mathrm { Cl } \right] \mathrm { Cl } _ { 2 } \cdot \mathrm { NH } _ { 3 } {/tex}
{tex} \left[ \mathrm { Co } \left( \mathrm { NH } _ { 3 } \right) _ { 5 } \mathrm { Cl } \right] \mathrm { C } _ { 2 } {/tex}
Correct4
Incorrect-1
In the coordination compound, {tex} K _ { 4 } \left[ \mathrm { Ni } ( \mathrm { CN } ) _ { 4 } \right] , {/tex} the oxidation state of nickel is
{tex}0{/tex}
{tex} + 1 {/tex}
{tex} + 2 {/tex}
{tex} - 1 {/tex}
Correct4
Incorrect-1
A red solid is insoluble in water. However it becomes soluble if some {tex} \mathrm { KI } {/tex} is added to water. Heating the red solid in a test tube results in liberation of some violet coloured fumes and droplets of a metal appear on the cooler parts of the test tube. The red solid is
{tex} \mathrm { HgI } _ { 2 } {/tex}
{tex} \mathrm { HgO } {/tex}
{tex} \mathrm { Pb } _ { 3 } \mathrm { O } _ { 4 } {/tex}
{tex} \left( \mathrm { NH } _ { 4 } \right) _ { 2 } \mathrm { Cr } _ { 2 } \mathrm { O } _ { 7 } {/tex}
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A reduction in atomic size with increase in atomic number is a characteristic of elements of
d-block
f-block
radioactive series
high atomic masses
Correct4
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What would happen when a solution of potassium chromate is treated with an excess of dilute nitric acid?
{tex} \mathrm { Cr } _ { 2 } \mathrm { O } _ { 7 } ^ { 2 - } {/tex} and {tex} \mathrm { H } _ { 2 } \mathrm { O } {/tex} are formed
{tex} \mathrm { CrO } _ { 4 } ^ { 2 - } {/tex} is reduced to {tex} + 3 {/tex} state of {tex} \mathrm { Cr } {/tex}
{tex} \mathrm { CrO } _ { 4 } ^ { 2 - } {/tex} is oxidized to {tex} + 7 {/tex} state of {tex} \mathrm { Cr } {/tex}
{tex} \mathrm { Cr } ^ { 3 + } {/tex} and {tex} \mathrm { Cr } _ { 2 } \mathrm { O } _ { 7 } ^ { 2 - } {/tex} are formed
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Which one of the following nitrates will leave behind a metal on strong heating?
Copper nitrate
Manganese nitrate
Silver nitrate
Ferric nitrate
Correct4
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Of the following outer electronic configurations of atoms, the highest oxidation state is achieved by which one of them?
{tex} ( n - 1 ) d ^ { 3 } n s ^ { 2 } {/tex}
{tex} ( n - 1 ) d ^ { 5 } n s ^ { 1 } {/tex}
{tex} ( n - 1 ) d ^ { 8 } n s ^ { 2 } {/tex}
{tex} ( n - 1 ) d ^ { 5 } n s ^ { 2 } {/tex}
Correct4
Incorrect-1
The soldiers of Napolean army while at Alps during freezing winter suffered a serious problem as regards to the tin buttons of their uniforms. White metallic tin buttons got converted to grey power. This transformation is related to
a change in the partial pressure of oxygen in the air
a change in the crystalline structure of tin
an interaction with nitrogen of the air at very low temperature
an interaction with water vapour contained in the humid air
Correct4
Incorrect-1
Among the properties (a) reducing (b) oxidising (c) complexing, the set of properties shown by {tex} \mathrm { CN } ^ { - } {/tex} ion towards metal species is
{tex} c,a {/tex}
{tex} b , c {/tex}
{tex} a , b {/tex}
{tex} a , b , c {/tex}
Correct4
Incorrect-1
The coordination number of a central metal atom in a complex is determined by
the number of ligands around a metal ion bonded by sigma and pi-bonds both
the number of ligands around a metal ion bonded by pi-bonds
the number of ligands around a metal ion bonded by sigma bonds
the number of only anionic ligands bonded to the metal ion.
Correct4
Incorrect-1
Which one of the following complexes is an outer orbital complex?
{tex} ( Atomic \ nos. : Mn=25;Fe=26;C0=27;Ni=28 ){/tex}
{tex} \left[ \mathrm { Co } \left( \mathrm { NH } _ { 3 } \right) _ { 6 } \right] ^ { 3 + } {/tex}
{tex} \left[ \mathrm { Mn } ( \mathrm { CN } ) _ { 6 } \right] ^ { 4 -} {/tex}
{tex} \left[ \mathrm { Fe } ( \mathrm { CN } ) _ { 6 } \right] ^ { 4- } {/tex}
{tex} \left[ \mathrm { Ni } \left( \mathrm { NH } _ { 3 } \right) _ { 6 } \right] ^ { 2 + } {/tex}
Correct4
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Coordination compounds have great importance in biological systems. In this context which of the following statements is incorrect?
Cyanocobalamin is {tex} \mathrm { B } _ { 12 } {/tex} and contains cobalt
Haemoglobin is the red pigment of blood and contains irons
Chlorophylls are green pigments in plants and contain calcium
Carboxypeptidase - {tex} A {/tex} is an exzyme and contains zinc.
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Incorrect-1
Cerium {tex} ( Z = 58) {/tex} is an important member of the lanthanoids. Which of the following statements about cerium is incorrect?
The {tex} + 4 {/tex} oxidation state of cerium is not known in solutions.
The {tex} + 3 {/tex} oxidation state of cerium is more stable than the {tex} + 4 {/tex} oxidation state
The common oxidation states of cerium are {tex} + 3 {/tex} and {tex} + 4 {/tex}
Cerium (IV) acts as an oxidizing agent
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Which one of the following has largest number of isomers?
{tex} \left[ \operatorname { Ir } \left( \mathrm { PR } _ { 3 } \right) _ { 2 } \mathrm { H } ( \mathrm { CO } ) \right] ^ { 2 + } {/tex}
{tex} \left[ \mathrm { Co } \left( \mathrm { NH } _ { 3 } \right) _ { 5 } \mathrm { Cl } \right] ^ { 2 + } {/tex}
{tex} \left[ \mathrm { Ru } \left( \mathrm { NH } _ { 3 } \right) _ { 4 } \mathrm { Cl } _ { 2 } \right] ^ { + } {/tex}
{tex} \left[ \mathrm { Co } ( \mathrm { en } ) _ { 2 } \mathrm { Cl } _ { 2 } \right] ^ { + } ( \mathrm { R } = \text { alkyl group, en } = \text { ethylenediamine } ) {/tex}
Correct4
Incorrect-1
The correct order of magnetic moments (spin only values in B.M.) anong is
{tex} (Atomic \ nos. :Mn=25, Fe=26,Co=27) {/tex}
{tex} \left[ \mathrm { Fe } ( \mathrm { CN } ) _ { 6 } \right] ^ { 4 -} > \left[ \mathrm { MnCl } _ { 4 } \right] ^ { 2 - } > \left[ \mathrm { CoCl } _ { 4 } \right] ^ { 2 - } {/tex}
{tex} \left[ \mathrm { MnCl } _ { 4 } \right] ^ { 2 - } > \left[ \mathrm { Fe } ( \mathrm { CN } ) _ { 6 } \right] ^ { 4 - } > \left[ \mathrm { CoCl } _ { 4 } \right] ^ { 2 - } {/tex}
{tex} \left[ \mathrm { MnCl } _ { 4 } \right] ^ { 2 - } > \left[ \mathrm { CoCl } _ { 4 } \right] ^ { 2 - } > \left[ \mathrm { Fe } ( \mathrm { CN } ) _ { 6 } \right] ^ { 4 - } {/tex}
{tex} \left[ \mathrm { Fe } ( \mathrm { CN } ) _ { 6 } \right] ^ { 4 - } > \left[ \mathrm { CoCl } _ { 4 } \right] ^ { 2 - } > \left[ \mathrm { MnCl } _ { 4 } \right] ^ { 2 - } {/tex}
