QBManager

CHXII08:THE D- & F-BLOCK ELEMENTS

321423 Which among the following cations will not form coloured compounds? (Atomic number $Cu = 29, Ti = 22, V = 23, Mn = 25$ )

1

V^{3 +}

2

{Ti}^{3 +}

3

{Cu}^{+}

4

{Mn}^{2 +}

Explanation:

$V^{3 +} : 3 d^{2} \to 2$ unpaired electrons
${Ti}^{3 +} : 3 d^{1} \to 1$ unpaired electron
${Cu}^{+} : 3 d^{10} \to$ No unpaired electron
${Mn}^{2 +} : 3 d^{5} \to 5$ unpaired electrons
Due to absence of unpaired electron, ${Cu}^{+}$ will not form coloured compounds.

MHTCET - 2021

CHXII08:THE D- & F-BLOCK ELEMENTS

321424 Which of the following forms a colourless solution in aqueous medium (in water)?

1

{Cr}^{3 +}

2

V^{3 +}

3

{Sc}^{3 +}

4

T i^{3 +}

Explanation:

supporting img
$S c^{3 +}$ forms a colourless solution in aqueous medium as it does not posses any unpaired electron.

CHXII08:THE D- & F-BLOCK ELEMENTS

321425 The orange colour of $K_{2} {Cr}_{2} O_{7}$ and purple colour of ${KMnO}_{4}$ is due to

1

d \to d

transitions in

K_{2} {Cr}_{2} O_{7}

and charge transfer transitions in

{KMnO}_{4}

.

2 charge transfer transition in both.

3

d \to d

transitions in both.

4

d \to d

transitions in

{KMnO}_{4}

and charge transfer transitions in

K_{2} {Cr}_{2} O_{7}

.

Explanation:

In $K_{2} {Cr}_{2} O_{7}$ and ${KMnO}_{4}$ , the colour is due to charge transfer phenomenon in which momentary transfer of $e^{-}$ from oxygen to metal atoms takes place. So, the correct option is (2).

JEE Main - 2024

CHXII08:THE D- & F-BLOCK ELEMENTS

321426 Which of the following compound is not coloured?

1

{Na}_{2} CuCl

2

{Na}_{2} Cd \cdot {Cl}_{4}

3

{FeSO}_{4}

4

{VI}_{3}

Explanation:

In ${Na}_{2} Cd \cdot {Cl}_{4}, {Cd}^{2 +}$ has no unpaired electron due to presence of $d^{10}$ electronic configuration. Hence, ${Na}_{2} Cd . {Cl}_{4}$ is a colourless compound.

CHXII08:THE D- & F-BLOCK ELEMENTS

321423 Which among the following cations will not form coloured compounds? (Atomic number $Cu = 29, Ti = 22, V = 23, Mn = 25$ )

1

V^{3 +}

2

{Ti}^{3 +}

3

{Cu}^{+}

4

{Mn}^{2 +}

Explanation:

$V^{3 +} : 3 d^{2} \to 2$ unpaired electrons
${Ti}^{3 +} : 3 d^{1} \to 1$ unpaired electron
${Cu}^{+} : 3 d^{10} \to$ No unpaired electron
${Mn}^{2 +} : 3 d^{5} \to 5$ unpaired electrons
Due to absence of unpaired electron, ${Cu}^{+}$ will not form coloured compounds.

MHTCET - 2021

CHXII08:THE D- & F-BLOCK ELEMENTS

321424 Which of the following forms a colourless solution in aqueous medium (in water)?

1

{Cr}^{3 +}

2

V^{3 +}

3

{Sc}^{3 +}

4

T i^{3 +}

Explanation:

supporting img
$S c^{3 +}$ forms a colourless solution in aqueous medium as it does not posses any unpaired electron.

CHXII08:THE D- & F-BLOCK ELEMENTS

321425 The orange colour of $K_{2} {Cr}_{2} O_{7}$ and purple colour of ${KMnO}_{4}$ is due to

1

d \to d

transitions in

K_{2} {Cr}_{2} O_{7}

and charge transfer transitions in

{KMnO}_{4}

.

2 charge transfer transition in both.

3

d \to d

transitions in both.

4

d \to d

transitions in

{KMnO}_{4}

and charge transfer transitions in

K_{2} {Cr}_{2} O_{7}

.

Explanation:

In $K_{2} {Cr}_{2} O_{7}$ and ${KMnO}_{4}$ , the colour is due to charge transfer phenomenon in which momentary transfer of $e^{-}$ from oxygen to metal atoms takes place. So, the correct option is (2).

JEE Main - 2024

CHXII08:THE D- & F-BLOCK ELEMENTS

321426 Which of the following compound is not coloured?

1

{Na}_{2} CuCl

2

{Na}_{2} Cd \cdot {Cl}_{4}

3

{FeSO}_{4}

4

{VI}_{3}

Explanation:

In ${Na}_{2} Cd \cdot {Cl}_{4}, {Cd}^{2 +}$ has no unpaired electron due to presence of $d^{10}$ electronic configuration. Hence, ${Na}_{2} Cd . {Cl}_{4}$ is a colourless compound.

CHXII08:THE D- & F-BLOCK ELEMENTS

321423 Which among the following cations will not form coloured compounds? (Atomic number $Cu = 29, Ti = 22, V = 23, Mn = 25$ )

1

V^{3 +}

2

{Ti}^{3 +}

3

{Cu}^{+}

4

{Mn}^{2 +}

Explanation:

$V^{3 +} : 3 d^{2} \to 2$ unpaired electrons
${Ti}^{3 +} : 3 d^{1} \to 1$ unpaired electron
${Cu}^{+} : 3 d^{10} \to$ No unpaired electron
${Mn}^{2 +} : 3 d^{5} \to 5$ unpaired electrons
Due to absence of unpaired electron, ${Cu}^{+}$ will not form coloured compounds.

MHTCET - 2021

CHXII08:THE D- & F-BLOCK ELEMENTS

321424 Which of the following forms a colourless solution in aqueous medium (in water)?

1

{Cr}^{3 +}

2

V^{3 +}

3

{Sc}^{3 +}

4

T i^{3 +}

Explanation:

supporting img
$S c^{3 +}$ forms a colourless solution in aqueous medium as it does not posses any unpaired electron.

CHXII08:THE D- & F-BLOCK ELEMENTS

321425 The orange colour of $K_{2} {Cr}_{2} O_{7}$ and purple colour of ${KMnO}_{4}$ is due to

1

d \to d

transitions in

K_{2} {Cr}_{2} O_{7}

and charge transfer transitions in

{KMnO}_{4}

.

2 charge transfer transition in both.

3

d \to d

transitions in both.

4

d \to d

transitions in

{KMnO}_{4}

and charge transfer transitions in

K_{2} {Cr}_{2} O_{7}

.

Explanation:

In $K_{2} {Cr}_{2} O_{7}$ and ${KMnO}_{4}$ , the colour is due to charge transfer phenomenon in which momentary transfer of $e^{-}$ from oxygen to metal atoms takes place. So, the correct option is (2).

JEE Main - 2024

CHXII08:THE D- & F-BLOCK ELEMENTS

321426 Which of the following compound is not coloured?

1

{Na}_{2} CuCl

2

{Na}_{2} Cd \cdot {Cl}_{4}

3

{FeSO}_{4}

4

{VI}_{3}

Explanation:

In ${Na}_{2} Cd \cdot {Cl}_{4}, {Cd}^{2 +}$ has no unpaired electron due to presence of $d^{10}$ electronic configuration. Hence, ${Na}_{2} Cd . {Cl}_{4}$ is a colourless compound.

CHXII08:THE D- & F-BLOCK ELEMENTS

321423 Which among the following cations will not form coloured compounds? (Atomic number $Cu = 29, Ti = 22, V = 23, Mn = 25$ )

1

V^{3 +}

2

{Ti}^{3 +}

3

{Cu}^{+}

4

{Mn}^{2 +}

Explanation:

$V^{3 +} : 3 d^{2} \to 2$ unpaired electrons
${Ti}^{3 +} : 3 d^{1} \to 1$ unpaired electron
${Cu}^{+} : 3 d^{10} \to$ No unpaired electron
${Mn}^{2 +} : 3 d^{5} \to 5$ unpaired electrons
Due to absence of unpaired electron, ${Cu}^{+}$ will not form coloured compounds.

MHTCET - 2021

CHXII08:THE D- & F-BLOCK ELEMENTS

321424 Which of the following forms a colourless solution in aqueous medium (in water)?

1

{Cr}^{3 +}

2

V^{3 +}

3

{Sc}^{3 +}

4

T i^{3 +}

Explanation:

supporting img
$S c^{3 +}$ forms a colourless solution in aqueous medium as it does not posses any unpaired electron.

CHXII08:THE D- & F-BLOCK ELEMENTS

321425 The orange colour of $K_{2} {Cr}_{2} O_{7}$ and purple colour of ${KMnO}_{4}$ is due to

1

d \to d

transitions in

K_{2} {Cr}_{2} O_{7}

and charge transfer transitions in

{KMnO}_{4}

.

2 charge transfer transition in both.

3

d \to d

transitions in both.

4

d \to d

transitions in

{KMnO}_{4}

and charge transfer transitions in

K_{2} {Cr}_{2} O_{7}

.

Explanation:

In $K_{2} {Cr}_{2} O_{7}$ and ${KMnO}_{4}$ , the colour is due to charge transfer phenomenon in which momentary transfer of $e^{-}$ from oxygen to metal atoms takes place. So, the correct option is (2).

JEE Main - 2024

CHXII08:THE D- & F-BLOCK ELEMENTS

321426 Which of the following compound is not coloured?

1

{Na}_{2} CuCl

2

{Na}_{2} Cd \cdot {Cl}_{4}

3

{FeSO}_{4}

4

{VI}_{3}

Explanation:

In ${Na}_{2} Cd \cdot {Cl}_{4}, {Cd}^{2 +}$ has no unpaired electron due to presence of $d^{10}$ electronic configuration. Hence, ${Na}_{2} Cd . {Cl}_{4}$ is a colourless compound.

Explanation:

Explanation:

Explanation:

Explanation:

Question Bank Series

Explanation:

Explanation:

Explanation:

Explanation:

Explanation:

Explanation:

Explanation:

Explanation:

Explanation:

Explanation:

Explanation:

Explanation: