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The d- and f- Block Elements - CBSE Questionbank | RevisionDojo

Practice The d- and f- Block Elements with authentic CBSE Chemistry exam questions for both SL and HL students. This question bank mirrors Paper 1, 2, 3 structure, covering key topics like atomic structure, chemical reactions, and organic chemistry. Get instant solutions, detailed explanations, and build exam confidence with questions in the style of CBSE examiners.

Type

Difficulty

Question 1

HLPaper 2

Account for the following:

Cu+ is unstable in an aqueous solution.
Transition metals form complex compounds.

Complete the following equation: Cr2O72- + 8H+ + 3NO2- →

Question 2

HLPaper 2

The chemistry of actionoids is more complicated than lanthanoids. Why?

Question 3

Complete the following chemical equations:

$\mathrm{MnO}_{4}^{-}$ + $\mathrm{C}_{2} \mathrm{O}_{4}^{2-}$ + H⁺ $\longrightarrow$

KMnO₄ $\xrightarrow{{Heat}}$

$\mathrm{Cr}_{2} \mathrm{O}_{7}^{2-}$ + H₂S + H⁺ $\longrightarrow$

Question 4

Explain the following observations:

Among the divalent cations in the first series of transition elements, manganese exhibits the maximum paramagnetism.

Cu⁺ ion is not known in aqueous solutions.

Question 5

In 3d series, which transition element has positive $\mathrm{E}_{\mathrm{M}^{2+/ \mathrm{M}}}^{\circ}$ value and why?

Name a member of lanthanide series which is well-known to show +4 oxidation state.

Give reason: The highest oxidation state is exhibited in oxoanions of transition metals.

Give reason: HCl is not used to acidify KMnO4 solution.

Question 6

Assertion (A): Transition metals have low melting points.
Reason (R): The involvement of greater number of (n – 1)d and ns electrons in the interatomic metallic bonding.

Question 7

Identify the following:

Transition metal of 3d series that exhibits the maximum number of oxidation states.

An alloy consisting of approximately 95% lanthanoid metal used to produce bullet, shell and lighter flint.

Question 8

Give reasons for the following:

Transition metals have high enthalpies of atomization.

Manganese has lower melting point even though it has a higher number of unpaired electrons for bonding.

Ce4+ is a strong oxidizing agent.

Question 9

Oxidation state of central metal atom in the given complex is:
[Co(NH₃)₄(H₂O)₂]Cl₃

Question 10

Complete and balance the following chemical equations: $C{r_2}O_7^{2 - } + {I^ - } + {H^ + } \to$

Complete and balance the following chemical equations: $MnO_4^ - + SO_3^{2 - } + {H^ + } \to$

Explain the following observation: Transition elements and their compounds are known to act as catalysts.

Explain the following observation: The higher oxidation states are usually exhibited by the members in the middle of a series of transition elements.

Explain the following observation: The metal-metal bonding is more frequently found in the second and third series of transition elements.

Type

Difficulty

Question 1

HLPaper 2

Account for the following:

Cu+ is unstable in an aqueous solution.
Transition metals form complex compounds.

Complete the following equation: Cr2O72- + 8H+ + 3NO2- →

Question 2

HLPaper 2

The chemistry of actionoids is more complicated than lanthanoids. Why?

Question 3

Complete the following chemical equations:

$\mathrm{MnO}_{4}^{-}$ + $\mathrm{C}_{2} \mathrm{O}_{4}^{2-}$ + H⁺ $\longrightarrow$

KMnO₄ $\xrightarrow{{Heat}}$

$\mathrm{Cr}_{2} \mathrm{O}_{7}^{2-}$ + H₂S + H⁺ $\longrightarrow$

Question 4

Explain the following observations:

Among the divalent cations in the first series of transition elements, manganese exhibits the maximum paramagnetism.

Cu⁺ ion is not known in aqueous solutions.

Question 5

In 3d series, which transition element has positive $\mathrm{E}_{\mathrm{M}^{2+/ \mathrm{M}}}^{\circ}$ value and why?

Name a member of lanthanide series which is well-known to show +4 oxidation state.

Give reason: The highest oxidation state is exhibited in oxoanions of transition metals.

Give reason: HCl is not used to acidify KMnO4 solution.

Question 6

Assertion (A): Transition metals have low melting points.
Reason (R): The involvement of greater number of (n – 1)d and ns electrons in the interatomic metallic bonding.

Question 7

Identify the following:

Transition metal of 3d series that exhibits the maximum number of oxidation states.

An alloy consisting of approximately 95% lanthanoid metal used to produce bullet, shell and lighter flint.

Question 8

Give reasons for the following:

Transition metals have high enthalpies of atomization.

Manganese has lower melting point even though it has a higher number of unpaired electrons for bonding.

Ce4+ is a strong oxidizing agent.

Question 9

Oxidation state of central metal atom in the given complex is:
[Co(NH₃)₄(H₂O)₂]Cl₃

Question 10

Complete and balance the following chemical equations: $C{r_2}O_7^{2 - } + {I^ - } + {H^ + } \to$

Complete and balance the following chemical equations: $MnO_4^ - + SO_3^{2 - } + {H^ + } \to$

Explain the following observation: Transition elements and their compounds are known to act as catalysts.

Explain the following observation: The higher oxidation states are usually exhibited by the members in the middle of a series of transition elements.

Explain the following observation: The metal-metal bonding is more frequently found in the second and third series of transition elements.

Type

Difficulty

Question 1

HLPaper 2

Account for the following:

Cu+ is unstable in an aqueous solution.
Transition metals form complex compounds.

Complete the following equation: Cr2O72- + 8H+ + 3NO2- →

Question 2

HLPaper 2

The chemistry of actionoids is more complicated than lanthanoids. Why?

Question 3

Complete the following chemical equations:

$\mathrm{MnO}_{4}^{-}$ + $\mathrm{C}_{2} \mathrm{O}_{4}^{2-}$ + H⁺ $\longrightarrow$

KMnO₄ $\xrightarrow{{Heat}}$

$\mathrm{Cr}_{2} \mathrm{O}_{7}^{2-}$ + H₂S + H⁺ $\longrightarrow$

Question 4

Explain the following observations:

Among the divalent cations in the first series of transition elements, manganese exhibits the maximum paramagnetism.

Cu⁺ ion is not known in aqueous solutions.

Question 5

In 3d series, which transition element has positive $\mathrm{E}_{\mathrm{M}^{2+/ \mathrm{M}}}^{\circ}$ value and why?

Name a member of lanthanide series which is well-known to show +4 oxidation state.

Give reason: The highest oxidation state is exhibited in oxoanions of transition metals.

Give reason: HCl is not used to acidify KMnO4 solution.

Question 6

Assertion (A): Transition metals have low melting points.
Reason (R): The involvement of greater number of (n – 1)d and ns electrons in the interatomic metallic bonding.

Question 7

Identify the following:

Transition metal of 3d series that exhibits the maximum number of oxidation states.

An alloy consisting of approximately 95% lanthanoid metal used to produce bullet, shell and lighter flint.

Question 8

Give reasons for the following:

Transition metals have high enthalpies of atomization.

Manganese has lower melting point even though it has a higher number of unpaired electrons for bonding.

Ce4+ is a strong oxidizing agent.

Question 9

Oxidation state of central metal atom in the given complex is:
[Co(NH₃)₄(H₂O)₂]Cl₃

Question 10

Complete and balance the following chemical equations: $C{r_2}O_7^{2 - } + {I^ - } + {H^ + } \to$

Complete and balance the following chemical equations: $MnO_4^ - + SO_3^{2 - } + {H^ + } \to$

Explain the following observation: Transition elements and their compounds are known to act as catalysts.

Explain the following observation: The higher oxidation states are usually exhibited by the members in the middle of a series of transition elements.

Explain the following observation: The metal-metal bonding is more frequently found in the second and third series of transition elements.

The d- and f- Block Elements Questionbank