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CHXII08:THE D- & F-BLOCK ELEMENTS

321556 The stability of ${Cu}^{2 +}$ is more than ${Cu}^{+}$ salts in aqueous solution due to

1 enthalpy of atomization

2 hydration energy

3 second ionisation enthalpy

4 first ionisation enthalpy

Explanation:

${Cu}^{+ 2}$ is more stable than ${Cu}^{+ 1}$ because released hydration energy is more in case of ${Cu}^{+ 2}$ than ${Cu}^{+ 1}$ .

NEET - 2023

CHXII08:THE D- & F-BLOCK ELEMENTS

321557 The stability of particular oxidation state of a metal in aqueous solution is determined by:

1 Enthalpy of sublimation of the metal

2 Ionization energy

3 Enthalpy of hydration of the metal ion

4 All of these

Explanation:

$M_{(s)} \to M_{(a q)}^{+ n} + n e^{-}$
The above change involves sublimation, ionization and hydration.

CHXII08:THE D- & F-BLOCK ELEMENTS

321558 Which of the following electronic configuration is associated with the highest stable oxidation state?

1

[A r] 3 d^{1} 4 s^{2}

2

[A r] 3 d^{5} 4 s^{1}

3

[A r] 3 d^{5} 4 s^{2}

4

[A r] 3 d^{6} 4 s^{2}

Explanation:

$Mn = [A r] 3 d^{5} 4 s^{2}$
Mn shows +7 oxidation state.

CHXII08:THE D- & F-BLOCK ELEMENTS

321559 Which one of the following species is stable in aqueous solution?

1

{MnO}_{4}^{2 -}

2

{MnO}_{4}^{3 -}

3

{Cu}^{+}

4

{Cr}^{2 +}

Explanation:

(1) ${MnO}_{4}^{2 -}$ disproportionates in neutral or acidic solution.
$3 {MnO}_{4}^{2 -} + 4 H^{+} \to 2 {MnO}_{4}^{2 -} + {MnO}_{2} + 2 H_{2} O$
(3) Many ${Cu}^{+}$ compounds are unstable in aqueous solution and undergo disproportionation as follows
$2 {Cu}^{+} \to {Cu}^{2 +} + Cu$

JEE - 2016

CHXII08:THE D- & F-BLOCK ELEMENTS

321556 The stability of ${Cu}^{2 +}$ is more than ${Cu}^{+}$ salts in aqueous solution due to

1 enthalpy of atomization

2 hydration energy

3 second ionisation enthalpy

4 first ionisation enthalpy

Explanation:

${Cu}^{+ 2}$ is more stable than ${Cu}^{+ 1}$ because released hydration energy is more in case of ${Cu}^{+ 2}$ than ${Cu}^{+ 1}$ .

NEET - 2023

CHXII08:THE D- & F-BLOCK ELEMENTS

321557 The stability of particular oxidation state of a metal in aqueous solution is determined by:

1 Enthalpy of sublimation of the metal

2 Ionization energy

3 Enthalpy of hydration of the metal ion

4 All of these

Explanation:

$M_{(s)} \to M_{(a q)}^{+ n} + n e^{-}$
The above change involves sublimation, ionization and hydration.

CHXII08:THE D- & F-BLOCK ELEMENTS

321558 Which of the following electronic configuration is associated with the highest stable oxidation state?

1

[A r] 3 d^{1} 4 s^{2}

2

[A r] 3 d^{5} 4 s^{1}

3

[A r] 3 d^{5} 4 s^{2}

4

[A r] 3 d^{6} 4 s^{2}

Explanation:

$Mn = [A r] 3 d^{5} 4 s^{2}$
Mn shows +7 oxidation state.

CHXII08:THE D- & F-BLOCK ELEMENTS

321559 Which one of the following species is stable in aqueous solution?

1

{MnO}_{4}^{2 -}

2

{MnO}_{4}^{3 -}

3

{Cu}^{+}

4

{Cr}^{2 +}

Explanation:

(1) ${MnO}_{4}^{2 -}$ disproportionates in neutral or acidic solution.
$3 {MnO}_{4}^{2 -} + 4 H^{+} \to 2 {MnO}_{4}^{2 -} + {MnO}_{2} + 2 H_{2} O$
(3) Many ${Cu}^{+}$ compounds are unstable in aqueous solution and undergo disproportionation as follows
$2 {Cu}^{+} \to {Cu}^{2 +} + Cu$

JEE - 2016

CHXII08:THE D- & F-BLOCK ELEMENTS

321556 The stability of ${Cu}^{2 +}$ is more than ${Cu}^{+}$ salts in aqueous solution due to

1 enthalpy of atomization

2 hydration energy

3 second ionisation enthalpy

4 first ionisation enthalpy

Explanation:

${Cu}^{+ 2}$ is more stable than ${Cu}^{+ 1}$ because released hydration energy is more in case of ${Cu}^{+ 2}$ than ${Cu}^{+ 1}$ .

NEET - 2023

CHXII08:THE D- & F-BLOCK ELEMENTS

321557 The stability of particular oxidation state of a metal in aqueous solution is determined by:

1 Enthalpy of sublimation of the metal

2 Ionization energy

3 Enthalpy of hydration of the metal ion

4 All of these

Explanation:

$M_{(s)} \to M_{(a q)}^{+ n} + n e^{-}$
The above change involves sublimation, ionization and hydration.

CHXII08:THE D- & F-BLOCK ELEMENTS

321558 Which of the following electronic configuration is associated with the highest stable oxidation state?

1

[A r] 3 d^{1} 4 s^{2}

2

[A r] 3 d^{5} 4 s^{1}

3

[A r] 3 d^{5} 4 s^{2}

4

[A r] 3 d^{6} 4 s^{2}

Explanation:

$Mn = [A r] 3 d^{5} 4 s^{2}$
Mn shows +7 oxidation state.

CHXII08:THE D- & F-BLOCK ELEMENTS

321559 Which one of the following species is stable in aqueous solution?

1

{MnO}_{4}^{2 -}

2

{MnO}_{4}^{3 -}

3

{Cu}^{+}

4

{Cr}^{2 +}

Explanation:

(1) ${MnO}_{4}^{2 -}$ disproportionates in neutral or acidic solution.
$3 {MnO}_{4}^{2 -} + 4 H^{+} \to 2 {MnO}_{4}^{2 -} + {MnO}_{2} + 2 H_{2} O$
(3) Many ${Cu}^{+}$ compounds are unstable in aqueous solution and undergo disproportionation as follows
$2 {Cu}^{+} \to {Cu}^{2 +} + Cu$

JEE - 2016

CHXII08:THE D- & F-BLOCK ELEMENTS

321556 The stability of ${Cu}^{2 +}$ is more than ${Cu}^{+}$ salts in aqueous solution due to

1 enthalpy of atomization

2 hydration energy

3 second ionisation enthalpy

4 first ionisation enthalpy

Explanation:

${Cu}^{+ 2}$ is more stable than ${Cu}^{+ 1}$ because released hydration energy is more in case of ${Cu}^{+ 2}$ than ${Cu}^{+ 1}$ .

NEET - 2023

CHXII08:THE D- & F-BLOCK ELEMENTS

321557 The stability of particular oxidation state of a metal in aqueous solution is determined by:

1 Enthalpy of sublimation of the metal

2 Ionization energy

3 Enthalpy of hydration of the metal ion

4 All of these

Explanation:

$M_{(s)} \to M_{(a q)}^{+ n} + n e^{-}$
The above change involves sublimation, ionization and hydration.

CHXII08:THE D- & F-BLOCK ELEMENTS

321558 Which of the following electronic configuration is associated with the highest stable oxidation state?

1

[A r] 3 d^{1} 4 s^{2}

2

[A r] 3 d^{5} 4 s^{1}

3

[A r] 3 d^{5} 4 s^{2}

4

[A r] 3 d^{6} 4 s^{2}

Explanation:

$Mn = [A r] 3 d^{5} 4 s^{2}$
Mn shows +7 oxidation state.

CHXII08:THE D- & F-BLOCK ELEMENTS

321559 Which one of the following species is stable in aqueous solution?

1

{MnO}_{4}^{2 -}

2

{MnO}_{4}^{3 -}

3

{Cu}^{+}

4

{Cr}^{2 +}

Explanation:

(1) ${MnO}_{4}^{2 -}$ disproportionates in neutral or acidic solution.
$3 {MnO}_{4}^{2 -} + 4 H^{+} \to 2 {MnO}_{4}^{2 -} + {MnO}_{2} + 2 H_{2} O$
(3) Many ${Cu}^{+}$ compounds are unstable in aqueous solution and undergo disproportionation as follows
$2 {Cu}^{+} \to {Cu}^{2 +} + Cu$

JEE - 2016