# 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.

## Mathematics

d and f Block Elements

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Q 1. The oxidation number is changed in which of the following case-

{tex} \mathrm { SO } _ { 2 } {/tex} gas is passed into {tex} \mathrm { Cr } _ { 2 } \mathrm { O } _ { 7 } ^ { 2 - } / \mathrm { H } ^ { + } {/tex}

B

Aqueous solution of {tex} \mathrm { CrO } _ { 4 } ^ { 2 - } {/tex} is acidified

C

{tex} \mathrm { CrO } _ { 2 } \mathrm { Cl } _ { 2 } {/tex} is dissolved in {tex} \mathrm { NaOH } {/tex}

D

{tex} \mathrm { Cr } _ { 2 } \mathrm { O } _ { 7 } ^ { 2 - } {/tex} solution is made alkaline

##### Explanation

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Q 2. 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 3. 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 4. A mixture of {tex} \mathrm { Mn } ^ { 2 + } \& \ \mathrm { Zn } ^ { 2 + } {/tex} can be separated by using an excess of-

A

{tex} \mathrm { NH } _ { 4 } \mathrm { OH } {/tex}

{tex} \mathrm { NaOH } {/tex}

C

{tex} \mathrm { H } _ { 2 } \mathrm { SO } _ { 4 } {/tex}

D

{tex} \mathrm { HNO } _ { 3 } {/tex}

##### Explanation

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Q 5. 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 6. The stability of particular oxidation state of a metal in aqueous solution is determined by:

A

Enthalpy of sublimation of the metal

B

Ionization energy

C

Enthalpy of hydration of the metal ion

All of these

##### Explanation

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Q 7. Which of the following is likely to form white salts?

A

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

{tex}\mathrm {Sc }^{ 3 + } {/tex}

C

{tex} \mathrm { Ti } ^ { 3 + } {/tex}

D

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

##### Explanation

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Q 8. Brass is an alloy of

A

Silver and copper

Copper and zinc

C

Copper and tin

D

Copper, zinc and tin