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JEE Main

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 experienced teachers.

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d and f Block Elements

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Q 1. Heating of Ag with dil. {tex}\mathrm{HNO_{3}}{/tex} gives

{tex} \mathrm { NO } {/tex}

B

{tex} \mathrm { NO } _ { 2 } {/tex}

C

{tex} \mathrm { N } _ { 2 } \mathrm { O } {/tex}

D

{tex} \mathrm { N } _ { 2 } \mathrm { O } _ { 3 } {/tex}

Explanation

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Q 2. When excess of {tex} \mathrm { SnCl } _ { 2 } {/tex} , is added to {tex} \mathrm { HgCl } _ { 2 } , {/tex} the substance formed is -

A

{tex} \mathrm { Hg } _ { 2 } \mathrm { Cl } _ { 2 } {/tex}

B

{tex}\mathrm{Sn}{/tex}

{tex} \mathrm { H } _ { \mathrm { g } } {/tex}

D

{tex} \mathrm { Cl } _ { 2 } {/tex}

Explanation

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Q 3. Which of the following statements concerning transition elements, is not true?

A

They are all metals.

B

They easily form complexes.

C

Compounds containing their ions are coloured.

They show multiple oxidation states always differing by two units.

Explanation

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Q 4. Which of the following compounds is not colored yellow?

A

{tex} \left( \mathrm { NH } _ { 4 } \right) _ { 3 } \left[ \mathrm { As } \left( \mathrm { Mo } _ { 3 } \mathrm { O } _ { 10 } \right) _ { 4 } \right] {/tex}

B

{tex} \mathrm { BaCrO } _ { 4 } {/tex}

{tex} \mathrm { Zn } _ { 2 } \left[ \mathrm { Fe } ( \mathrm { CN } ) _ { 6 } \right] {/tex}

D

{tex} \mathrm { K } _ { 3 } \left[ \mathrm { Co } \left( \mathrm { NO } _ { 2 } \right) _ { 6 } \right] {/tex}

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Q 5. The number of geometric isomers that can exist for square planar complex
{tex} [Pt \ (Cl) \ (py) \ (NH_{3}) \ (NH_{2}OH)]^{+} {/tex}
(py=pyridine):

A

4

B

6

C

2

3

Explanation


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Q 6. 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



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Q 7. The oxidation state of chromium in the final product formed by the reaction between {tex} \mathrm { Kl } {/tex} and acidified potassium dichromate solution is:

{tex} + 3 {/tex}

B

{tex} + 2 {/tex}

C

{tex} + 6 {/tex}

D

{tex} + 4 {/tex}

Explanation

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Q 8. Which one of the following has an optical isomer?

A

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

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

C

{tex} \left[ \mathrm { Co } \left( \mathrm { H } _ { 2 } \mathrm { O } \right) _ { 4 } ( \mathrm { en } ) \right] ^ { 3 + } {/tex}

D

{tex} \left[ \mathrm { Zn } ( \mathrm { en } ) _ { 2 } \right] ^ { 2 + } {/tex}

Explanation



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Q 9. The octahedral complex of a metal ion {tex} \mathrm { M } ^ { 3 + } {/tex} with four monodentate ligands {tex} L _ { 1 } , L _ { 2 } , L _ { 3 } {/tex} and {tex} L _ { 4 } {/tex} absorb wavelengths in the region of red, green, yellow and blue, respectively. The increasing order of ligand strength of the four ligands is:

A

{tex} L _ { 4 } < L _ { 3 } < L _ { 2 } < L _ { 1 } {/tex}

{tex} L _ { 1 } < L _ { 3 } < L _ { 2 } < L _ { 4 } {/tex}

C

{tex} L _ { 3 } < L _ { 2 } < L _ { 4 } < L _ { 1 } {/tex}

D

{tex} L _ { 1 } < L _ { 2 } < L _ { 4 } < L _ { 3 } {/tex}

Explanation





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Q 10. Which one of the following complexes shows optical isomerism?
{tex} ( \mathrm { en } = \text { ethylenediamine } ) {/tex}

A

{tex} \operatorname { trans } \left[ \mathrm { Co } ( \mathrm { en } ) _ { 2 } \mathrm { Cl } _ { 2 } \right] \mathrm { Cl } {/tex}

B

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

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

D

{tex} \operatorname { cis } \left[ \mathrm { Co } ( \mathrm { en } ) _ { 2 } \mathrm { Cl } _ { 2 } \right] \mathrm { Cl } {/tex}

Explanation



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Q 11. The color of {tex}\mathrm{ KMnO_{4} }{/tex} is due to:

{tex} \mathrm { L } \rightarrow \mathrm { M } {/tex} charge transfer transition

B

{tex} \sigma - \sigma ^ { * } {/tex} transition

C

{tex} \mathrm { M } \rightarrow {/tex} L charge transfer transition

D

{tex} \mathrm { d } - \mathrm { d } {/tex} transition

Explanation

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Q 12. Aluminium chloride exists as dimer, {tex} \mathrm { Al } _ { 2 } {/tex}{tex} \mathrm { Cl } _ { 6 } {/tex} in solid state as well as in solution of non-polar solvents such as benzene. When dissolved in water, it gives

A

{tex} \mathrm { Al } ^ { 3 + } + 3 \mathrm { Cl } ^ { - } {/tex}

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

C

{tex} \left[ \mathrm { Al } ( \mathrm { OH } ) _ { 6 } \right] ^ { 3 - } + 3 \mathrm { HCl } {/tex}

D

{tex} \mathrm { Al } _ { 2 } \mathrm { O } _ { 3 } + 6 \mathrm { HCl } {/tex}

Explanation

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Q 13. 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 powder. This transformation is related to

A

an interaction with nitrogen of the air at very low temperatures

a change in the crystalline structure of tin

C

a change in the partial pressure of oxygen in the air

D

an interaction with water vapour contained in the humid air.

Explanation





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Q 14. 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

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Q 15. Knowing that the chemistry of lanthanoids(Ln) is dominated by its {tex} + 3 {/tex} oxidation state, which of the following statements is incorrect?

A

The ionic size of Ln (III) decrease in general with increasing atomic number.

Ln (III) compounds are generally colourless.

C

Ln (III) hydroxide are mainly basic in character.

D

Because of the large size of the Ln (III) ions the bonding in its compounds is predominantly ionic in character.

Explanation

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Q 16. 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

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Q 17. {tex} \text { The outer electron configuration of Gd (Atomic No..: } 64 ) {/tex} is:

A

{tex}4 \mathrm { f } ^ { 3 } 5 \mathrm { d } ^ { 5 } 6 \mathrm { s } ^ { 2 } {/tex}

B

{tex} 4f ^ { 8 } 5 d ^ { 0 } 6 s ^ { 2 } {/tex}

C

4{tex} f ^ { 4 } 5 d ^ { 4 } 6 s ^ { 2 } {/tex}

{tex}4 \mathrm { f } ^ { 7 } 5 \mathrm { d } ^ { 1 } 6 \mathrm { s } ^ { 2 } {/tex}

Explanation

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Q 18. Iron exhibits {tex} + 2 {/tex} and {tex} + 3 {/tex} oxidation states. Which of the following statements about iron is incorrect?

A

Ferrous oxide is more basic in nature than the ferric oxide.

B

Ferrous compounds are relatively more ionic than the corresponding ferric compounds.

C

Ferrous compounds are less volatile than the corresponding ferric compounds.

Ferrous compounds are more easily hydrolysed than the corresponding ferric compounds.

Explanation

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Q 19. {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


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Q 20. In {tex} \mathrm { Fe } ( \mathrm { CO } ) _ { 5 } , {/tex} the {tex} \mathrm { Fe } - \mathrm { C } {/tex} bond possesses

A

ionic character

B

{tex} \sigma {/tex} -character only

C

{tex} \pi {/tex} -character

both {tex} \sigma {/tex} and {tex} \pi {/tex} characters

Explanation

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Q 21. The actinoids exhibit more number of oxidation states in general than the lanthanoids. This is because

the {tex}5 \mathrm { f } {/tex} orbitals extend further from the nucleus than the 4 forbitals

B

the {tex}5 \mathrm { f } {/tex} orbitals are more buried than the 4 forbitals

C

there is a similarity between {tex}4 \mathrm { f } {/tex} and {tex} 5\mathrm { f } {/tex} orbitals in their angular part of the wave function

D

the actinoids are more reactive than the lanthanoids.

Explanation

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Q 22. A reduction in atomic size with increase in atomic number is a characteristic of elements of

A

high atomic masses

B

{tex} d - {/tex} block

{tex} f - {/tex} block

D

radioactive series.

Explanation


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Q 23. The number and type of bonds between two carbon
atoms in calcium carbide are

A

one sigma, one pi

one sigma, two pi

C

two sigma, one pi

D

two sigma, two pi

Explanation



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Q 24. 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

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Q 25. The magnetic moment (spin only) of {tex} \left[ \mathrm { NiCl } _ { 4 } \right] ^ { 2 - } {/tex} is :

A

{tex} 1.82\mathrm { BM } {/tex}

B

{tex} 5.46\mathrm { BM } {/tex}

{tex}2.82 \mathrm { BM } {/tex}

D

{tex} 1.41\mathrm { BM } {/tex}

Explanation