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CHXII08:THE D- & F-BLOCK ELEMENTS

321568 Which of the following statements are correct?
(A) The $M^{3 +} / M^{2 +}$ reduction potential for iron is greater than manganese.
(B) The higher oxidation states of first row d-block elements get stabilized by oxide ion.
(C) Aqueous solution of ${Cr}^{2 +}$ can liberate hydrogen from dilute acid.
(D) Magnetic moment of $V^{2 +}$ is observed between 4.4 - 5.2 B.M.
Choose the correct answer from the options given below:

1 (A), (B), (D) only

2 (A), (B) only

3 (C), (D) only

4 (B), (C) only

Explanation:

$∙$ The $M^{3 +} / M^{2 +}$ reduction potential of iron and manganese are 0.77 V and 1.57 V , respectively.
$∙$ Higher oxidation states of first row d-block elements are stabilised by atoms of high electronegativities like O and F .
$∙$ ${Cr}^{2 +}$ is highly reactive in its aqueous solution, hence can liberate hydrogen from dilute acid.
$∙$ Magnetic moment of $V^{2 +}$ is observed to be 3.87 B.M.
Therefore, only statements (B) and (C) are correct.

JEE - 2023

CHXII08:THE D- & F-BLOCK ELEMENTS

321569 The $E^{\circ} (M^{2 +} / M)$ value for copper is positive $(+ 0.34 V)$ . What is possible reason for this?

1 Low

Δ_{a} H^{\circ}

and high

Δ_{hyd} H^{\circ}

2 High

Δ_{a} H^{\circ}

and Low

Δ_{hyd} H^{\circ}

3 Low

Δ_{a} H^{\circ}

and Low

Δ_{hyd} H^{\circ}

4 High

Δ_{a} H^{\circ}

and High

Δ_{hyd} H^{\circ}

CHXII08:THE D- & F-BLOCK ELEMENTS

321570 Assertion :
Reduction potential of $Mn( - 3 to 2)$ is more positive than $Fe( + 3 to + 2) .$
Reason :
Ionisation potential of $Mn$ is more than that of $Fe$ .

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.

2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.

3 Assertion is correct but Reason is incorrect.

4 Assertion is incorrect but Reason is correct.

Explanation:

${Mn}^{2 +} = [Ar] 3 d^{5}, {Mn}^{3 +} = [Ar] 3 d^{4}$
${Fe}^{2 +} = [Ar] 3 d^{6}, {Fe}^{3 +} = [Ar] 3 d^{5}$
Thus, ${Mn}^{2 +}$ has more stable configuration than ${Mn}^{3 +}$ while ${Fe}^{3 +}$ has more stable configuration than ${Fe}^{2 +}$ . Hence, reduction potential for ${Mn}^{3 +} / {Mn}^{2 +}$ couple is more positive than ${Fe}^{3 +} / {Fe}^{2 +}$ .
As we move across the period, ionisation potential increases, thus, ionisation potential of $Fe (762 KJ / mol)$ is more than that of $Mn (717$ $KJ / mol$ ). So option (3) is correct.

CHXII08:THE D- & F-BLOCK ELEMENTS

321571 The electronic configuration of $Cu (II)$ is $3 d^{9}$ whereas that of $Cu (I)$ is $3 d^{10}$ . Which of the following is correct?

1 Cu (II) is more stable.

2 Stability of

Cu (I)

and

Cu (

II

)

depends on nature of copper salts.

3

Cu (II)

is less stable.

4

Cu (I)

and

Cu (II)

are equally stable.

Explanation:

Copper (I) compounds are unstable in aqueous solution and undergo disproportionation.
$2 {Cu}^{+} \to {Cu}^{2 +} + Cu$
The stability of ${Cu}_{(aq)}^{2 +}$ is due to much more negative $Δ_{hyd} H^{\circ}$ of ${Cu}_{(aq)}^{2 +}$ than ${Cu}_{(aq)}^{+}$ .
It is more significant than fulfilled electronic configuration. So, the correct option is (1).

JEE Main - 2024

CHXII08:THE D- & F-BLOCK ELEMENTS

321572 Assertion :
${Cu}^{2 +}$ is the only ion $(M^{2 +})$ which has positive $E_{r e d}^{o} (M^{2 +} / M)$ in $3 d$ series.
Reason :
$Cu$ has lower hydration enthalpy as comparision to its I.E. and $Δ H_{atomisation}$ .

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.

2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.

3 Assertion is correct but Reason is incorrect.

4 Assertion is incorrect but reason is correct.

CHXII08:THE D- & F-BLOCK ELEMENTS

321568 Which of the following statements are correct?
(A) The $M^{3 +} / M^{2 +}$ reduction potential for iron is greater than manganese.
(B) The higher oxidation states of first row d-block elements get stabilized by oxide ion.
(C) Aqueous solution of ${Cr}^{2 +}$ can liberate hydrogen from dilute acid.
(D) Magnetic moment of $V^{2 +}$ is observed between 4.4 - 5.2 B.M.
Choose the correct answer from the options given below:

1 (A), (B), (D) only

2 (A), (B) only

3 (C), (D) only

4 (B), (C) only

Explanation:

$∙$ The $M^{3 +} / M^{2 +}$ reduction potential of iron and manganese are 0.77 V and 1.57 V , respectively.
$∙$ Higher oxidation states of first row d-block elements are stabilised by atoms of high electronegativities like O and F .
$∙$ ${Cr}^{2 +}$ is highly reactive in its aqueous solution, hence can liberate hydrogen from dilute acid.
$∙$ Magnetic moment of $V^{2 +}$ is observed to be 3.87 B.M.
Therefore, only statements (B) and (C) are correct.

JEE - 2023

CHXII08:THE D- & F-BLOCK ELEMENTS

321569 The $E^{\circ} (M^{2 +} / M)$ value for copper is positive $(+ 0.34 V)$ . What is possible reason for this?

1 Low

Δ_{a} H^{\circ}

and high

Δ_{hyd} H^{\circ}

2 High

Δ_{a} H^{\circ}

and Low

Δ_{hyd} H^{\circ}

3 Low

Δ_{a} H^{\circ}

and Low

Δ_{hyd} H^{\circ}

4 High

Δ_{a} H^{\circ}

and High

Δ_{hyd} H^{\circ}

CHXII08:THE D- & F-BLOCK ELEMENTS

321570 Assertion :
Reduction potential of $Mn( - 3 to 2)$ is more positive than $Fe( + 3 to + 2) .$
Reason :
Ionisation potential of $Mn$ is more than that of $Fe$ .

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.

2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.

3 Assertion is correct but Reason is incorrect.

4 Assertion is incorrect but Reason is correct.

Explanation:

${Mn}^{2 +} = [Ar] 3 d^{5}, {Mn}^{3 +} = [Ar] 3 d^{4}$
${Fe}^{2 +} = [Ar] 3 d^{6}, {Fe}^{3 +} = [Ar] 3 d^{5}$
Thus, ${Mn}^{2 +}$ has more stable configuration than ${Mn}^{3 +}$ while ${Fe}^{3 +}$ has more stable configuration than ${Fe}^{2 +}$ . Hence, reduction potential for ${Mn}^{3 +} / {Mn}^{2 +}$ couple is more positive than ${Fe}^{3 +} / {Fe}^{2 +}$ .
As we move across the period, ionisation potential increases, thus, ionisation potential of $Fe (762 KJ / mol)$ is more than that of $Mn (717$ $KJ / mol$ ). So option (3) is correct.

CHXII08:THE D- & F-BLOCK ELEMENTS

321571 The electronic configuration of $Cu (II)$ is $3 d^{9}$ whereas that of $Cu (I)$ is $3 d^{10}$ . Which of the following is correct?

1 Cu (II) is more stable.

2 Stability of

Cu (I)

and

Cu (

II

)

depends on nature of copper salts.

3

Cu (II)

is less stable.

4

Cu (I)

and

Cu (II)

are equally stable.

Explanation:

Copper (I) compounds are unstable in aqueous solution and undergo disproportionation.
$2 {Cu}^{+} \to {Cu}^{2 +} + Cu$
The stability of ${Cu}_{(aq)}^{2 +}$ is due to much more negative $Δ_{hyd} H^{\circ}$ of ${Cu}_{(aq)}^{2 +}$ than ${Cu}_{(aq)}^{+}$ .
It is more significant than fulfilled electronic configuration. So, the correct option is (1).

JEE Main - 2024

CHXII08:THE D- & F-BLOCK ELEMENTS

321572 Assertion :
${Cu}^{2 +}$ is the only ion $(M^{2 +})$ which has positive $E_{r e d}^{o} (M^{2 +} / M)$ in $3 d$ series.
Reason :
$Cu$ has lower hydration enthalpy as comparision to its I.E. and $Δ H_{atomisation}$ .

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.

2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.

3 Assertion is correct but Reason is incorrect.

4 Assertion is incorrect but reason is correct.

CHXII08:THE D- & F-BLOCK ELEMENTS

321568 Which of the following statements are correct?
(A) The $M^{3 +} / M^{2 +}$ reduction potential for iron is greater than manganese.
(B) The higher oxidation states of first row d-block elements get stabilized by oxide ion.
(C) Aqueous solution of ${Cr}^{2 +}$ can liberate hydrogen from dilute acid.
(D) Magnetic moment of $V^{2 +}$ is observed between 4.4 - 5.2 B.M.
Choose the correct answer from the options given below:

1 (A), (B), (D) only

2 (A), (B) only

3 (C), (D) only

4 (B), (C) only

Explanation:

$∙$ The $M^{3 +} / M^{2 +}$ reduction potential of iron and manganese are 0.77 V and 1.57 V , respectively.
$∙$ Higher oxidation states of first row d-block elements are stabilised by atoms of high electronegativities like O and F .
$∙$ ${Cr}^{2 +}$ is highly reactive in its aqueous solution, hence can liberate hydrogen from dilute acid.
$∙$ Magnetic moment of $V^{2 +}$ is observed to be 3.87 B.M.
Therefore, only statements (B) and (C) are correct.

JEE - 2023

CHXII08:THE D- & F-BLOCK ELEMENTS

321569 The $E^{\circ} (M^{2 +} / M)$ value for copper is positive $(+ 0.34 V)$ . What is possible reason for this?

1 Low

Δ_{a} H^{\circ}

and high

Δ_{hyd} H^{\circ}

2 High

Δ_{a} H^{\circ}

and Low

Δ_{hyd} H^{\circ}

3 Low

Δ_{a} H^{\circ}

and Low

Δ_{hyd} H^{\circ}

4 High

Δ_{a} H^{\circ}

and High

Δ_{hyd} H^{\circ}

CHXII08:THE D- & F-BLOCK ELEMENTS

321570 Assertion :
Reduction potential of $Mn( - 3 to 2)$ is more positive than $Fe( + 3 to + 2) .$
Reason :
Ionisation potential of $Mn$ is more than that of $Fe$ .

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.

2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.

3 Assertion is correct but Reason is incorrect.

4 Assertion is incorrect but Reason is correct.

Explanation:

${Mn}^{2 +} = [Ar] 3 d^{5}, {Mn}^{3 +} = [Ar] 3 d^{4}$
${Fe}^{2 +} = [Ar] 3 d^{6}, {Fe}^{3 +} = [Ar] 3 d^{5}$
Thus, ${Mn}^{2 +}$ has more stable configuration than ${Mn}^{3 +}$ while ${Fe}^{3 +}$ has more stable configuration than ${Fe}^{2 +}$ . Hence, reduction potential for ${Mn}^{3 +} / {Mn}^{2 +}$ couple is more positive than ${Fe}^{3 +} / {Fe}^{2 +}$ .
As we move across the period, ionisation potential increases, thus, ionisation potential of $Fe (762 KJ / mol)$ is more than that of $Mn (717$ $KJ / mol$ ). So option (3) is correct.

CHXII08:THE D- & F-BLOCK ELEMENTS

321571 The electronic configuration of $Cu (II)$ is $3 d^{9}$ whereas that of $Cu (I)$ is $3 d^{10}$ . Which of the following is correct?

1 Cu (II) is more stable.

2 Stability of

Cu (I)

and

Cu (

II

)

depends on nature of copper salts.

3

Cu (II)

is less stable.

4

Cu (I)

and

Cu (II)

are equally stable.

Explanation:

Copper (I) compounds are unstable in aqueous solution and undergo disproportionation.
$2 {Cu}^{+} \to {Cu}^{2 +} + Cu$
The stability of ${Cu}_{(aq)}^{2 +}$ is due to much more negative $Δ_{hyd} H^{\circ}$ of ${Cu}_{(aq)}^{2 +}$ than ${Cu}_{(aq)}^{+}$ .
It is more significant than fulfilled electronic configuration. So, the correct option is (1).

JEE Main - 2024

CHXII08:THE D- & F-BLOCK ELEMENTS

321572 Assertion :
${Cu}^{2 +}$ is the only ion $(M^{2 +})$ which has positive $E_{r e d}^{o} (M^{2 +} / M)$ in $3 d$ series.
Reason :
$Cu$ has lower hydration enthalpy as comparision to its I.E. and $Δ H_{atomisation}$ .

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.

2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.

3 Assertion is correct but Reason is incorrect.

4 Assertion is incorrect but reason is correct.

CHXII08:THE D- & F-BLOCK ELEMENTS

321568 Which of the following statements are correct?
(A) The $M^{3 +} / M^{2 +}$ reduction potential for iron is greater than manganese.
(B) The higher oxidation states of first row d-block elements get stabilized by oxide ion.
(C) Aqueous solution of ${Cr}^{2 +}$ can liberate hydrogen from dilute acid.
(D) Magnetic moment of $V^{2 +}$ is observed between 4.4 - 5.2 B.M.
Choose the correct answer from the options given below:

1 (A), (B), (D) only

2 (A), (B) only

3 (C), (D) only

4 (B), (C) only

Explanation:

$∙$ The $M^{3 +} / M^{2 +}$ reduction potential of iron and manganese are 0.77 V and 1.57 V , respectively.
$∙$ Higher oxidation states of first row d-block elements are stabilised by atoms of high electronegativities like O and F .
$∙$ ${Cr}^{2 +}$ is highly reactive in its aqueous solution, hence can liberate hydrogen from dilute acid.
$∙$ Magnetic moment of $V^{2 +}$ is observed to be 3.87 B.M.
Therefore, only statements (B) and (C) are correct.

JEE - 2023

CHXII08:THE D- & F-BLOCK ELEMENTS

321569 The $E^{\circ} (M^{2 +} / M)$ value for copper is positive $(+ 0.34 V)$ . What is possible reason for this?

1 Low

Δ_{a} H^{\circ}

and high

Δ_{hyd} H^{\circ}

2 High

Δ_{a} H^{\circ}

and Low

Δ_{hyd} H^{\circ}

3 Low

Δ_{a} H^{\circ}

and Low

Δ_{hyd} H^{\circ}

4 High

Δ_{a} H^{\circ}

and High

Δ_{hyd} H^{\circ}

CHXII08:THE D- & F-BLOCK ELEMENTS

321570 Assertion :
Reduction potential of $Mn( - 3 to 2)$ is more positive than $Fe( + 3 to + 2) .$
Reason :
Ionisation potential of $Mn$ is more than that of $Fe$ .

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.

2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.

3 Assertion is correct but Reason is incorrect.

4 Assertion is incorrect but Reason is correct.

Explanation:

${Mn}^{2 +} = [Ar] 3 d^{5}, {Mn}^{3 +} = [Ar] 3 d^{4}$
${Fe}^{2 +} = [Ar] 3 d^{6}, {Fe}^{3 +} = [Ar] 3 d^{5}$
Thus, ${Mn}^{2 +}$ has more stable configuration than ${Mn}^{3 +}$ while ${Fe}^{3 +}$ has more stable configuration than ${Fe}^{2 +}$ . Hence, reduction potential for ${Mn}^{3 +} / {Mn}^{2 +}$ couple is more positive than ${Fe}^{3 +} / {Fe}^{2 +}$ .
As we move across the period, ionisation potential increases, thus, ionisation potential of $Fe (762 KJ / mol)$ is more than that of $Mn (717$ $KJ / mol$ ). So option (3) is correct.

CHXII08:THE D- & F-BLOCK ELEMENTS

321571 The electronic configuration of $Cu (II)$ is $3 d^{9}$ whereas that of $Cu (I)$ is $3 d^{10}$ . Which of the following is correct?

1 Cu (II) is more stable.

2 Stability of

Cu (I)

and

Cu (

II

)

depends on nature of copper salts.

3

Cu (II)

is less stable.

4

Cu (I)

and

Cu (II)

are equally stable.

Explanation:

Copper (I) compounds are unstable in aqueous solution and undergo disproportionation.
$2 {Cu}^{+} \to {Cu}^{2 +} + Cu$
The stability of ${Cu}_{(aq)}^{2 +}$ is due to much more negative $Δ_{hyd} H^{\circ}$ of ${Cu}_{(aq)}^{2 +}$ than ${Cu}_{(aq)}^{+}$ .
It is more significant than fulfilled electronic configuration. So, the correct option is (1).

JEE Main - 2024

CHXII08:THE D- & F-BLOCK ELEMENTS

321572 Assertion :
${Cu}^{2 +}$ is the only ion $(M^{2 +})$ which has positive $E_{r e d}^{o} (M^{2 +} / M)$ in $3 d$ series.
Reason :
$Cu$ has lower hydration enthalpy as comparision to its I.E. and $Δ H_{atomisation}$ .

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.

2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.

3 Assertion is correct but Reason is incorrect.

4 Assertion is incorrect but reason is correct.

CHXII08:THE D- & F-BLOCK ELEMENTS

321568 Which of the following statements are correct?
(A) The $M^{3 +} / M^{2 +}$ reduction potential for iron is greater than manganese.
(B) The higher oxidation states of first row d-block elements get stabilized by oxide ion.
(C) Aqueous solution of ${Cr}^{2 +}$ can liberate hydrogen from dilute acid.
(D) Magnetic moment of $V^{2 +}$ is observed between 4.4 - 5.2 B.M.
Choose the correct answer from the options given below:

1 (A), (B), (D) only

2 (A), (B) only

3 (C), (D) only

4 (B), (C) only

Explanation:

$∙$ The $M^{3 +} / M^{2 +}$ reduction potential of iron and manganese are 0.77 V and 1.57 V , respectively.
$∙$ Higher oxidation states of first row d-block elements are stabilised by atoms of high electronegativities like O and F .
$∙$ ${Cr}^{2 +}$ is highly reactive in its aqueous solution, hence can liberate hydrogen from dilute acid.
$∙$ Magnetic moment of $V^{2 +}$ is observed to be 3.87 B.M.
Therefore, only statements (B) and (C) are correct.

JEE - 2023

CHXII08:THE D- & F-BLOCK ELEMENTS

321569 The $E^{\circ} (M^{2 +} / M)$ value for copper is positive $(+ 0.34 V)$ . What is possible reason for this?

1 Low

Δ_{a} H^{\circ}

and high

Δ_{hyd} H^{\circ}

2 High

Δ_{a} H^{\circ}

and Low

Δ_{hyd} H^{\circ}

3 Low

Δ_{a} H^{\circ}

and Low

Δ_{hyd} H^{\circ}

4 High

Δ_{a} H^{\circ}

and High

Δ_{hyd} H^{\circ}

CHXII08:THE D- & F-BLOCK ELEMENTS

321570 Assertion :
Reduction potential of $Mn( - 3 to 2)$ is more positive than $Fe( + 3 to + 2) .$
Reason :
Ionisation potential of $Mn$ is more than that of $Fe$ .

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.

2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.

3 Assertion is correct but Reason is incorrect.

4 Assertion is incorrect but Reason is correct.

Explanation:

${Mn}^{2 +} = [Ar] 3 d^{5}, {Mn}^{3 +} = [Ar] 3 d^{4}$
${Fe}^{2 +} = [Ar] 3 d^{6}, {Fe}^{3 +} = [Ar] 3 d^{5}$
Thus, ${Mn}^{2 +}$ has more stable configuration than ${Mn}^{3 +}$ while ${Fe}^{3 +}$ has more stable configuration than ${Fe}^{2 +}$ . Hence, reduction potential for ${Mn}^{3 +} / {Mn}^{2 +}$ couple is more positive than ${Fe}^{3 +} / {Fe}^{2 +}$ .
As we move across the period, ionisation potential increases, thus, ionisation potential of $Fe (762 KJ / mol)$ is more than that of $Mn (717$ $KJ / mol$ ). So option (3) is correct.

CHXII08:THE D- & F-BLOCK ELEMENTS

321571 The electronic configuration of $Cu (II)$ is $3 d^{9}$ whereas that of $Cu (I)$ is $3 d^{10}$ . Which of the following is correct?

1 Cu (II) is more stable.

2 Stability of

Cu (I)

and

Cu (

II

)

depends on nature of copper salts.

3

Cu (II)

is less stable.

4

Cu (I)

and

Cu (II)

are equally stable.

Explanation:

Copper (I) compounds are unstable in aqueous solution and undergo disproportionation.
$2 {Cu}^{+} \to {Cu}^{2 +} + Cu$
The stability of ${Cu}_{(aq)}^{2 +}$ is due to much more negative $Δ_{hyd} H^{\circ}$ of ${Cu}_{(aq)}^{2 +}$ than ${Cu}_{(aq)}^{+}$ .
It is more significant than fulfilled electronic configuration. So, the correct option is (1).

JEE Main - 2024

CHXII08:THE D- & F-BLOCK ELEMENTS

321572 Assertion :
${Cu}^{2 +}$ is the only ion $(M^{2 +})$ which has positive $E_{r e d}^{o} (M^{2 +} / M)$ in $3 d$ series.
Reason :
$Cu$ has lower hydration enthalpy as comparision to its I.E. and $Δ H_{atomisation}$ .

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.

2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.

3 Assertion is correct but Reason is incorrect.

4 Assertion is incorrect but reason is correct.

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