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CHXII08:THE D- & F-BLOCK ELEMENTS

321401 The number of ions from the following that have the ability to liberate hydrogen from a dilute acid is ____.
${Ti}^{2 +}, {Cr}^{2 +} and V^{2 +}$

1 0

2 1

3 3

4 2

Explanation:

$T i V C r$
$E^{^{\circ}} (M^{3 +} / M^{2 +}) - 0.37 - 0.26 - 0.41$
$(i n v o l t s)$
The above $E^{\circ}$ values indicate that ${Ti}^{2 +}, V^{2 +}$ and ${Cr}^{2 +}$ ions are strong reducing agents and can liberate hydrogen from a dilute acid. So, the correct option is (3).

JEE Main - 2024

CHXII08:THE D- & F-BLOCK ELEMENTS

321402 Assertion :
Copper sulphate solution is not stored in zinc vessel.
Reason :
Zinc forms complex with ${CuSO}_{4}$ .

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:

Electropositive element like zinc precipitates copper from a solution of copper sulphate and finally forms a complex.
$\begin{aligned} {CuSO}_{4 (aq)} & + Zn \to \\ Cu & + {ZnSO}_{4 (aq)} or [Zn {(H_{2} O)}_{4}] {SO}_{4} \end{aligned}$
So option (1) is correct.

CHXII08:THE D- & F-BLOCK ELEMENTS

321403 Some metals tend to develop a highly unreactive surface when brought into contact with powerful oxidizing agents. A metal that is rended passively by concentrated ${HNO}_{3}$ is

1 iron because of an oxide coating

2 iron because of an nitrate coating

3 copper because of its oxide coating

4 Zinc because of its nitride coating

CHXII08:THE D- & F-BLOCK ELEMENTS

321404 Why does copper not replace hydrogen from acids ?

1

Cu

is more electropositive than

H

2

Cu

is metal while

H

is non metal

3

Cu

shows positive

E^{0}

value

4 Both (1) and (2)

CHXII08:THE D- & F-BLOCK ELEMENTS

321405 Assertion :
Zinc becomes dull in moist air.
Reason :
Zinc is coated by a thin film of its basic carbonate in moist air.

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:

$4 Zn + 3 H_{2} O + 2 O_{2} + {CO}_{2} \to {ZnCO}_{3} \cdot 3 Zn (OH)_{2}$
When exposed to moist air, zinc undergoes a reaction resulting in the formation of a thin film of basic carbonates on its surface, causing it to lose its luster and appear dull. So option (1) is correct.

CHXII08:THE D- & F-BLOCK ELEMENTS

321401 The number of ions from the following that have the ability to liberate hydrogen from a dilute acid is ____.
${Ti}^{2 +}, {Cr}^{2 +} and V^{2 +}$

1 0

2 1

3 3

4 2

Explanation:

$T i V C r$
$E^{^{\circ}} (M^{3 +} / M^{2 +}) - 0.37 - 0.26 - 0.41$
$(i n v o l t s)$
The above $E^{\circ}$ values indicate that ${Ti}^{2 +}, V^{2 +}$ and ${Cr}^{2 +}$ ions are strong reducing agents and can liberate hydrogen from a dilute acid. So, the correct option is (3).

JEE Main - 2024

CHXII08:THE D- & F-BLOCK ELEMENTS

321402 Assertion :
Copper sulphate solution is not stored in zinc vessel.
Reason :
Zinc forms complex with ${CuSO}_{4}$ .

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:

Electropositive element like zinc precipitates copper from a solution of copper sulphate and finally forms a complex.
$\begin{aligned} {CuSO}_{4 (aq)} & + Zn \to \\ Cu & + {ZnSO}_{4 (aq)} or [Zn {(H_{2} O)}_{4}] {SO}_{4} \end{aligned}$
So option (1) is correct.

CHXII08:THE D- & F-BLOCK ELEMENTS

321403 Some metals tend to develop a highly unreactive surface when brought into contact with powerful oxidizing agents. A metal that is rended passively by concentrated ${HNO}_{3}$ is

1 iron because of an oxide coating

2 iron because of an nitrate coating

3 copper because of its oxide coating

4 Zinc because of its nitride coating

CHXII08:THE D- & F-BLOCK ELEMENTS

321404 Why does copper not replace hydrogen from acids ?

1

Cu

is more electropositive than

H

2

Cu

is metal while

H

is non metal

3

Cu

shows positive

E^{0}

value

4 Both (1) and (2)

CHXII08:THE D- & F-BLOCK ELEMENTS

321405 Assertion :
Zinc becomes dull in moist air.
Reason :
Zinc is coated by a thin film of its basic carbonate in moist air.

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:

$4 Zn + 3 H_{2} O + 2 O_{2} + {CO}_{2} \to {ZnCO}_{3} \cdot 3 Zn (OH)_{2}$
When exposed to moist air, zinc undergoes a reaction resulting in the formation of a thin film of basic carbonates on its surface, causing it to lose its luster and appear dull. So option (1) is correct.

CHXII08:THE D- & F-BLOCK ELEMENTS

321401 The number of ions from the following that have the ability to liberate hydrogen from a dilute acid is ____.
${Ti}^{2 +}, {Cr}^{2 +} and V^{2 +}$

1 0

2 1

3 3

4 2

Explanation:

$T i V C r$
$E^{^{\circ}} (M^{3 +} / M^{2 +}) - 0.37 - 0.26 - 0.41$
$(i n v o l t s)$
The above $E^{\circ}$ values indicate that ${Ti}^{2 +}, V^{2 +}$ and ${Cr}^{2 +}$ ions are strong reducing agents and can liberate hydrogen from a dilute acid. So, the correct option is (3).

JEE Main - 2024

CHXII08:THE D- & F-BLOCK ELEMENTS

321402 Assertion :
Copper sulphate solution is not stored in zinc vessel.
Reason :
Zinc forms complex with ${CuSO}_{4}$ .

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:

Electropositive element like zinc precipitates copper from a solution of copper sulphate and finally forms a complex.
$\begin{aligned} {CuSO}_{4 (aq)} & + Zn \to \\ Cu & + {ZnSO}_{4 (aq)} or [Zn {(H_{2} O)}_{4}] {SO}_{4} \end{aligned}$
So option (1) is correct.

CHXII08:THE D- & F-BLOCK ELEMENTS

321403 Some metals tend to develop a highly unreactive surface when brought into contact with powerful oxidizing agents. A metal that is rended passively by concentrated ${HNO}_{3}$ is

1 iron because of an oxide coating

2 iron because of an nitrate coating

3 copper because of its oxide coating

4 Zinc because of its nitride coating

CHXII08:THE D- & F-BLOCK ELEMENTS

321404 Why does copper not replace hydrogen from acids ?

1

Cu

is more electropositive than

H

2

Cu

is metal while

H

is non metal

3

Cu

shows positive

E^{0}

value

4 Both (1) and (2)

CHXII08:THE D- & F-BLOCK ELEMENTS

321405 Assertion :
Zinc becomes dull in moist air.
Reason :
Zinc is coated by a thin film of its basic carbonate in moist air.

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:

$4 Zn + 3 H_{2} O + 2 O_{2} + {CO}_{2} \to {ZnCO}_{3} \cdot 3 Zn (OH)_{2}$
When exposed to moist air, zinc undergoes a reaction resulting in the formation of a thin film of basic carbonates on its surface, causing it to lose its luster and appear dull. So option (1) is correct.

CHXII08:THE D- & F-BLOCK ELEMENTS

321401 The number of ions from the following that have the ability to liberate hydrogen from a dilute acid is ____.
${Ti}^{2 +}, {Cr}^{2 +} and V^{2 +}$

1 0

2 1

3 3

4 2

Explanation:

$T i V C r$
$E^{^{\circ}} (M^{3 +} / M^{2 +}) - 0.37 - 0.26 - 0.41$
$(i n v o l t s)$
The above $E^{\circ}$ values indicate that ${Ti}^{2 +}, V^{2 +}$ and ${Cr}^{2 +}$ ions are strong reducing agents and can liberate hydrogen from a dilute acid. So, the correct option is (3).

JEE Main - 2024

CHXII08:THE D- & F-BLOCK ELEMENTS

321402 Assertion :
Copper sulphate solution is not stored in zinc vessel.
Reason :
Zinc forms complex with ${CuSO}_{4}$ .

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:

Electropositive element like zinc precipitates copper from a solution of copper sulphate and finally forms a complex.
$\begin{aligned} {CuSO}_{4 (aq)} & + Zn \to \\ Cu & + {ZnSO}_{4 (aq)} or [Zn {(H_{2} O)}_{4}] {SO}_{4} \end{aligned}$
So option (1) is correct.

CHXII08:THE D- & F-BLOCK ELEMENTS

321403 Some metals tend to develop a highly unreactive surface when brought into contact with powerful oxidizing agents. A metal that is rended passively by concentrated ${HNO}_{3}$ is

1 iron because of an oxide coating

2 iron because of an nitrate coating

3 copper because of its oxide coating

4 Zinc because of its nitride coating

CHXII08:THE D- & F-BLOCK ELEMENTS

321404 Why does copper not replace hydrogen from acids ?

1

Cu

is more electropositive than

H

2

Cu

is metal while

H

is non metal

3

Cu

shows positive

E^{0}

value

4 Both (1) and (2)

CHXII08:THE D- & F-BLOCK ELEMENTS

321405 Assertion :
Zinc becomes dull in moist air.
Reason :
Zinc is coated by a thin film of its basic carbonate in moist air.

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:

$4 Zn + 3 H_{2} O + 2 O_{2} + {CO}_{2} \to {ZnCO}_{3} \cdot 3 Zn (OH)_{2}$
When exposed to moist air, zinc undergoes a reaction resulting in the formation of a thin film of basic carbonates on its surface, causing it to lose its luster and appear dull. So option (1) is correct.

CHXII08:THE D- & F-BLOCK ELEMENTS

321401 The number of ions from the following that have the ability to liberate hydrogen from a dilute acid is ____.
${Ti}^{2 +}, {Cr}^{2 +} and V^{2 +}$

1 0

2 1

3 3

4 2

Explanation:

$T i V C r$
$E^{^{\circ}} (M^{3 +} / M^{2 +}) - 0.37 - 0.26 - 0.41$
$(i n v o l t s)$
The above $E^{\circ}$ values indicate that ${Ti}^{2 +}, V^{2 +}$ and ${Cr}^{2 +}$ ions are strong reducing agents and can liberate hydrogen from a dilute acid. So, the correct option is (3).

JEE Main - 2024

CHXII08:THE D- & F-BLOCK ELEMENTS

321402 Assertion :
Copper sulphate solution is not stored in zinc vessel.
Reason :
Zinc forms complex with ${CuSO}_{4}$ .

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:

Electropositive element like zinc precipitates copper from a solution of copper sulphate and finally forms a complex.
$\begin{aligned} {CuSO}_{4 (aq)} & + Zn \to \\ Cu & + {ZnSO}_{4 (aq)} or [Zn {(H_{2} O)}_{4}] {SO}_{4} \end{aligned}$
So option (1) is correct.

CHXII08:THE D- & F-BLOCK ELEMENTS

321403 Some metals tend to develop a highly unreactive surface when brought into contact with powerful oxidizing agents. A metal that is rended passively by concentrated ${HNO}_{3}$ is

1 iron because of an oxide coating

2 iron because of an nitrate coating

3 copper because of its oxide coating

4 Zinc because of its nitride coating

CHXII08:THE D- & F-BLOCK ELEMENTS

321404 Why does copper not replace hydrogen from acids ?

1

Cu

is more electropositive than

H

2

Cu

is metal while

H

is non metal

3

Cu

shows positive

E^{0}

value

4 Both (1) and (2)

CHXII08:THE D- & F-BLOCK ELEMENTS

321405 Assertion :
Zinc becomes dull in moist air.
Reason :
Zinc is coated by a thin film of its basic carbonate in moist air.

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:

$4 Zn + 3 H_{2} O + 2 O_{2} + {CO}_{2} \to {ZnCO}_{3} \cdot 3 Zn (OH)_{2}$
When exposed to moist air, zinc undergoes a reaction resulting in the formation of a thin film of basic carbonates on its surface, causing it to lose its luster and appear dull. So option (1) is correct.