JEE Main > d and f Block Elements

Explore popular questions from d and f Block Elements for JEE Main. This collection covers d and f Block Elements previous year JEE Main questions hand picked by popular teachers.


Q 1.    

Correct4

Incorrect-1

A square planar complex is formed by hybridisation of which atomic orbitals?

A

{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}

C

{tex} \mathrm { s } , \mathrm { p } _ { \mathrm {x } } , \mathrm { p } _ { \mathrm { y } } , \mathrm { d } _ { \mathbf { z } } ^ { 2 } {/tex}

D

{tex} \mathrm { s } , \mathrm { p } _ { \mathrm { y } } , \mathrm { p } _ { \mathrm { z } } , \mathrm { d } _ { \mathrm { x y } } {/tex}

Explanation

Q 2.    

Correct4

Incorrect-1

The type of isomerism present in nitropentammine chromium (III) chloride is

A

optical

linkage

C

ionization

D

polymerisation.

Explanation


Q 3.    

Correct4

Incorrect-1

{tex} \mathrm { CH } _ { 3 } - \mathrm { Mg } - \mathrm { Br } {/tex} is an organo metallic compound due to

A

{tex} \mathrm { Mg } - \mathrm { Br } {/tex} bond

{tex} \mathrm { C } - \mathrm { Mg } {/tex} bond

C

{tex} \mathrm { C } - \mathrm { Br } {/tex} bond

D

{tex} \mathrm { C } - \mathrm { H } {/tex} bond

Explanation


Q 4.    

Correct4

Incorrect-1

Most common oxidation states of Ce (cerium) are

A

{tex} + 2 , + 3 {/tex}

B

{tex} + 2 , + 4 {/tex}

{tex} + 3 , + 4 {/tex}

D

{tex} + 3 , + 5 {/tex}

Explanation

Q 5.    

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Incorrect-1

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}

B

{tex} \mathrm { Ce } ^ { + 3 } < \mathrm { Yb } ^ { + 3 } < \mathrm { Pm } ^ { + 3 } < \mathrm { La } ^ { + 3 } {/tex}

C

{tex} \mathrm { Yb } ^ { + 3 } < \mathrm { Pm } ^ { + 3 } < \mathrm { La } ^ { + 3 } < \mathrm { Ce } ^ { + 3 } {/tex}

D

{tex} \mathrm { Pm } ^ { + 3 } < \mathrm { La } ^ { + 3 } < \mathrm { Ce } ^ { + 3 } < \mathrm { Yb } ^ { + 3 } {/tex}

Explanation


Q 6.    

Correct4

Incorrect-1

Which of the following ions has the maximum magnetic moment?

{tex} \mathrm { Mn } ^ { + 2 } {/tex}

B

{tex} \mathrm { F } \mathrm { e } ^ { + 2 } {/tex}

C

{tex} \mathrm { Ti } ^ { + 2 } {/tex}

D

{tex} \mathrm { Cr } ^ { + 2 } {/tex}

Explanation

Q 7.    

Correct4

Incorrect-1

The most stable ion is

A

{tex} \left[ \mathrm { Fe } \left( \mathrm { OH } _ { 3 } \right] ^ { 3- } \right. {/tex}

B

{tex} \left[ \mathrm { Fe } ( \mathrm { Cl } ) _ { 6 } \right] ^ { 3-} {/tex}

{tex} \left[ \mathrm { Fe } ( \mathrm { CN } ) _ { 6 } \right] ^ { 3- } {/tex}

D

{tex} \left[ \mathrm { Fe } \left( \mathrm { H } _ { 2 } \mathrm { O } \right) _ { 6 } \right] ^ { 3 + } {/tex}

Explanation

Q 8.    

Correct4

Incorrect-1

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

A

{tex} 4,3,1,5 {/tex}

B

{tex} 1,5,3,7 {/tex}

{tex} 1,3,4,5 {/tex}

D

{tex} 3,5,7,1 {/tex}

Explanation

Q 9.    

Correct4

Incorrect-1

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} ) ?

A

{tex}1.40\, \mathrm {{\textÅ}} {/tex}

B

{tex} 1.06\mathrm { Å} {/tex}

{tex} 0.85\mathrm { Å } {/tex}

D

{tex} 1.60\mathrm { Å } {/tex}

Explanation

Q 10.    

Correct4

Incorrect-1

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

B

In alkaline solutions insoluble {tex} \mathrm { Cu } ( \mathrm { OH } ) _ { 2 } {/tex} is precipitated which is soluble in excess of any alkali

C

Copper hydroxide is an amphoteric substance

D

In acidic solutions hydration protects copper ions

Explanation

Q 11.    

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

A

{tex} \left[ \mathrm { Co } \left( \mathrm { NH } _ { 3 } \right) _ { 3 } \mathrm { Cl } _ { 3 } \right] \cdot 2 \mathrm { NH } _ { 3 } {/tex}

B

{tex} \left.\left[ \mathrm { Co } \mathrm (NH _ { 3 } \right) _ { 4 } \mathrm { Cl } _ { 2 } \right] \mathrm { Cl } \cdot \mathrm { NH } _ { 3 } {/tex}

C

{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}

Explanation

Q 12.    

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}

B

{tex} + 1 {/tex}

C

{tex} + 2 {/tex}

D

{tex} - 1 {/tex}

Explanation

Q 13.    

Correct4

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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}

B

{tex} \mathrm { HgO } {/tex}

C

{tex} \mathrm { Pb } _ { 3 } \mathrm { O } _ { 4 } {/tex}

D

{tex} \left( \mathrm { NH } _ { 4 } \right) _ { 2 } \mathrm { Cr } _ { 2 } \mathrm { O } _ { 7 } {/tex}

Explanation

Q 14.    

Correct4

Incorrect-1

A reduction in atomic size with increase in atomic number is a characteristic of elements of

A

d-block

f-block

C

radioactive series

D

high atomic masses

Explanation

Q 15.    

Correct4

Incorrect-1

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

B

{tex} \mathrm { CrO } _ { 4 } ^ { 2 - } {/tex} is reduced to {tex} + 3 {/tex} state of {tex} \mathrm { Cr } {/tex}

C

{tex} \mathrm { CrO } _ { 4 } ^ { 2 - } {/tex} is oxidized to {tex} + 7 {/tex} state of {tex} \mathrm { Cr } {/tex}

D

{tex} \mathrm { Cr } ^ { 3 + } {/tex} and {tex} \mathrm { Cr } _ { 2 } \mathrm { O } _ { 7 } ^ { 2 - } {/tex} are formed

Explanation

Q 16.    

Correct4

Incorrect-1

Which one of the following nitrates will leave behind a metal on strong heating?

A

Copper nitrate

B

Manganese nitrate

Silver nitrate

D

Ferric nitrate

Explanation

Q 17.    

Correct4

Incorrect-1

Of the following outer electronic configurations of atoms, the highest oxidation state is achieved by which one of them?

A

{tex} ( n - 1 ) d ^ { 3 } n s ^ { 2 } {/tex}

B

{tex} ( n - 1 ) d ^ { 5 } n s ^ { 1 } {/tex}

C

{tex} ( n - 1 ) d ^ { 8 } n s ^ { 2 } {/tex}

{tex} ( n - 1 ) d ^ { 5 } n s ^ { 2 } {/tex}

Explanation

Q 18.    

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

a change in the partial pressure of oxygen in the air

a change in the crystalline structure of tin

C

an interaction with nitrogen of the air at very low temperature

D

an interaction with water vapour contained in the humid air

Explanation

Q 19.    

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}

B

{tex} b , c {/tex}

C

{tex} a , b {/tex}

D

{tex} a , b , c {/tex}

Explanation

Q 20.    

Correct4

Incorrect-1

The coordination number of a central metal atom in a complex is determined by

A

the number of ligands around a metal ion bonded by sigma and pi-bonds both

B

the number of ligands around a metal ion bonded by pi-bonds

the number of ligands around a metal ion bonded by sigma bonds

D

the number of only anionic ligands bonded to the metal ion.

Explanation

Q 21.    

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}

A

{tex} \left[ \mathrm { Co } \left( \mathrm { NH } _ { 3 } \right) _ { 6 } \right] ^ { 3 + } {/tex}

B

{tex} \left[ \mathrm { Mn } ( \mathrm { CN } ) _ { 6 } \right] ^ { 4 -} {/tex}

C

{tex} \left[ \mathrm { Fe } ( \mathrm { CN } ) _ { 6 } \right] ^ { 4- } {/tex}

{tex} \left[ \mathrm { Ni } \left( \mathrm { NH } _ { 3 } \right) _ { 6 } \right] ^ { 2 + } {/tex}

Explanation

Q 22.    

Correct4

Incorrect-1

Coordination compounds have great importance in biological systems. In this context which of the following statements is incorrect?

A

Cyanocobalamin is {tex} \mathrm { B } _ { 12 } {/tex} and contains cobalt

B

Haemoglobin is the red pigment of blood and contains irons

Chlorophylls are green pigments in plants and contain calcium

D

Carboxypeptidase - {tex} A {/tex} is an exzyme and contains zinc.

Explanation

Q 23.    

Correct4

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.

B

The {tex} + 3 {/tex} oxidation state of cerium is more stable than the {tex} + 4 {/tex} oxidation state

C

The common oxidation states of cerium are {tex} + 3 {/tex} and {tex} + 4 {/tex}

D

Cerium (IV) acts as an oxidizing agent

Explanation

Q 24.    

Correct4

Incorrect-1

Which one of the following has largest number of isomers?

A

{tex} \left[ \operatorname { Ir } \left( \mathrm { PR } _ { 3 } \right) _ { 2 } \mathrm { H } ( \mathrm { CO } ) \right] ^ { 2 + } {/tex}

B

{tex} \left[ \mathrm { Co } \left( \mathrm { NH } _ { 3 } \right) _ { 5 } \mathrm { Cl } \right] ^ { 2 + } {/tex}

C

{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}

Explanation

Q 25.    

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}

A

{tex} \left[ \mathrm { Fe } ( \mathrm { CN } ) _ { 6 } \right] ^ { 4 -} > \left[ \mathrm { MnCl } _ { 4 } \right] ^ { 2 - } > \left[ \mathrm { CoCl } _ { 4 } \right] ^ { 2 - } {/tex}

B

{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}

D

{tex} \left[ \mathrm { Fe } ( \mathrm { CN } ) _ { 6 } \right] ^ { 4 - } > \left[ \mathrm { CoCl } _ { 4 } \right] ^ { 2 - } > \left[ \mathrm { MnCl } _ { 4 } \right] ^ { 2 - } {/tex}

Explanation