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

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d and f Block Elements

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Q 1. The reason for greater range of oxidation states in actinoids is attributed to

A

actinoid contraction

{tex}5f, 6d {/tex} and {tex} 7s {/tex} levels having comparable energies

C

{tex} 4f {/tex} and {tex} 5d {/tex} levels being close in energies

D

the radioactive nature of actinoids.

Explanation


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Q 2. Which one of the following statements is correct when {tex} \mathrm { SO } _ { 2 } {/tex} is passed through acidified {tex} \mathrm { K } _ { 2 } \mathrm { Cr } _ { 2 } \mathrm { O } _ { 7 } {/tex} solution?

A

{tex} \mathrm { SO } _ { 2 } {/tex} is reduced

Green {tex} \mathrm { Cr } _ { 2 } \left( \mathrm { SO } _ { 4 } \right) _ { 3 } {/tex} is formed.

C

The solution turns blue.

D

The solution is decolourised.

Explanation

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Q 3. Gadolinium belongs to 4{tex} f {/tex} series. Its atomic number is {tex} 64 . {/tex} Which of the following is the correct electronic configuration of gadolinium?

A

{tex} [ \mathrm { Xe } ] 4 f ^ { 9 } 5 s ^ { 1 } {/tex}

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

C

{tex} [ \mathrm { Xe } ] 4 f ^ { 6 } 5 d ^ { - 6 } 6 s ^ { 2 } {/tex}

D

{tex} [ \mathrm { Xe } ] 4 f ^ { 8 } 6 d ^ { 2 } {/tex}

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Q 4. The reaction of aqueous {tex} \mathrm { KMnO } _ { 4 } {/tex} with {tex} \mathrm { H } _ { 2 } \mathrm { O } _ { 2 } {/tex} in acidic conditions gives

A

{tex} \mathrm { Mn } ^ { 4 + } {/tex} and {tex} \mathrm { O } _ { 2 } {/tex}

{tex} \mathrm { Mn } ^ { 2 + } {/tex} and {tex} \mathrm { O } _ { 2 } {/tex}

C

{tex} \mathrm { Mn } ^ { 2 + } {/tex} and {tex} \mathrm { O } _ { 3 } {/tex}

D

{tex} \mathrm { Mn } ^ { 4 + }{/tex}and {tex} \mathrm { MnO } _ { 2 } {/tex}

Explanation


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Q 5. Reason of lanthanoid contraction is

negligible screening effect of {tex} 'f'{/tex} -orbitals

B

increasing nuclear charge

C

decreasing nuclear charge

D

decreasing screening effect.

Explanation


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Q 6. Which of the following has more unpaird {tex} d {/tex} -electrons?

A

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

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

C

{tex} \mathrm{Zn^{+}} {/tex}

D

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

Explanation


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Q 7. Which one of the following elements shows maximum number of different oxidation states in its compounds?

A

Gd

B

La

C

Eu

Am

Explanation