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CHXI11:THE P-BLOCK ELEMENTS

316357 Chlorine is prepared in the laboratory by the action of

1

Zn

and

HCl

2

{CaCO}_{3}

and

HCl

3

Pb {({NO}_{3})}_{2}

and

HCl

4

{MnO}_{2}

and

HCl

Explanation:

${MnO}_{2} + 4 HCl \to {MnCl}_{2} + {Cl}_{2} + 2 H_{2} O$

CHXI11:THE P-BLOCK ELEMENTS

316358 Assertion :
Chlorine undergoes disproportionation reaction in alkaline medium.
Reason :
${Cl}_{2}$ is an oxidising agent.

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:

$C l_{2} + 2 NaO H_{(dil)} \overset{cold}{\to} NaCl + NaOCl + H_{2} O$
$3 {Cl}_{2} + 6 {NaOH}_{(conc)} \overset{heat}{\to}$
$5 NaCl + {NaClO}_{3} + 3 H_{2} O$
Chlorine is simultaneously reduced to
chloride ion $({Cl}^{-})$ and is oxidised to either ${ClO}^{-}$
or ${ClO}_{3}^{-}$ ion. Halogens (e.g., $Cl$ ) have a strong tendency to accept electrons. Thus, they act as strong oxidising agents. So option (2) is correct.

CHXI11:THE P-BLOCK ELEMENTS

316359 Concentrated hydrochloric acid when kept in open air sometimes produces a cloud of white fumes. The explanation for it is that

1 Concentrated hydrochloric acid emits strongly smelling HCl gas all the time

2 Oxygen in air reacts with the emitted HCl gas to form a cloud of chlorine gas

3 Strong affinity of HCl gas for moisture in air results in forming of droplets of liquid solution which appears like a cloudy smoke

4 Due to strong affinity for water, concentrated hydrochloric acid pulls moisture of air towards itself. This moisture forms droplets of water and hence the cloud.

Explanation:

$4 HCl + O_{2} ⟶ 2 {Cl}_{2} + 2 H_{2} O$
Appearance of cloud is due to formation of chlorine.

CHXI11:THE P-BLOCK ELEMENTS

316360 Assertion :
$NaCl$ reacts with concentrated $H_{2} {SO}_{4}$ to give colourless fumes with pungent smell. But on adding ${MnO}_{2}$ the fumes become greenish yellow.
Reason :
${MnO}_{2}$ oxidises $HCl$ to chlorine gas which is greenish yellow.

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 Both Assertion and Reason are incorrect.

Explanation:

$NaCl$ reacts with concentrated $H_{2} {SO}_{4}$ to give colourless fumes with pungent smell. This pungent smell is due to foramtion of $HCl$ .
$NaCl + H_{2} {SO}_{4} \to {Na}_{2} {SO}_{4} + 2 HCl$
But on adding ${MnO}_{2}$ , the fumes become greenish yellow due to formation of chlorine gas.

AIIMS - 2018

CHXI11:THE P-BLOCK ELEMENTS

316357 Chlorine is prepared in the laboratory by the action of

1

Zn

and

HCl

2

{CaCO}_{3}

and

HCl

3

Pb {({NO}_{3})}_{2}

and

HCl

4

{MnO}_{2}

and

HCl

Explanation:

${MnO}_{2} + 4 HCl \to {MnCl}_{2} + {Cl}_{2} + 2 H_{2} O$

CHXI11:THE P-BLOCK ELEMENTS

316358 Assertion :
Chlorine undergoes disproportionation reaction in alkaline medium.
Reason :
${Cl}_{2}$ is an oxidising agent.

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:

$C l_{2} + 2 NaO H_{(dil)} \overset{cold}{\to} NaCl + NaOCl + H_{2} O$
$3 {Cl}_{2} + 6 {NaOH}_{(conc)} \overset{heat}{\to}$
$5 NaCl + {NaClO}_{3} + 3 H_{2} O$
Chlorine is simultaneously reduced to
chloride ion $({Cl}^{-})$ and is oxidised to either ${ClO}^{-}$
or ${ClO}_{3}^{-}$ ion. Halogens (e.g., $Cl$ ) have a strong tendency to accept electrons. Thus, they act as strong oxidising agents. So option (2) is correct.

CHXI11:THE P-BLOCK ELEMENTS

316359 Concentrated hydrochloric acid when kept in open air sometimes produces a cloud of white fumes. The explanation for it is that

1 Concentrated hydrochloric acid emits strongly smelling HCl gas all the time

2 Oxygen in air reacts with the emitted HCl gas to form a cloud of chlorine gas

3 Strong affinity of HCl gas for moisture in air results in forming of droplets of liquid solution which appears like a cloudy smoke

4 Due to strong affinity for water, concentrated hydrochloric acid pulls moisture of air towards itself. This moisture forms droplets of water and hence the cloud.

Explanation:

$4 HCl + O_{2} ⟶ 2 {Cl}_{2} + 2 H_{2} O$
Appearance of cloud is due to formation of chlorine.

CHXI11:THE P-BLOCK ELEMENTS

316360 Assertion :
$NaCl$ reacts with concentrated $H_{2} {SO}_{4}$ to give colourless fumes with pungent smell. But on adding ${MnO}_{2}$ the fumes become greenish yellow.
Reason :
${MnO}_{2}$ oxidises $HCl$ to chlorine gas which is greenish yellow.

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 Both Assertion and Reason are incorrect.

Explanation:

$NaCl$ reacts with concentrated $H_{2} {SO}_{4}$ to give colourless fumes with pungent smell. This pungent smell is due to foramtion of $HCl$ .
$NaCl + H_{2} {SO}_{4} \to {Na}_{2} {SO}_{4} + 2 HCl$
But on adding ${MnO}_{2}$ , the fumes become greenish yellow due to formation of chlorine gas.

AIIMS - 2018

CHXI11:THE P-BLOCK ELEMENTS

316357 Chlorine is prepared in the laboratory by the action of

1

Zn

and

HCl

2

{CaCO}_{3}

and

HCl

3

Pb {({NO}_{3})}_{2}

and

HCl

4

{MnO}_{2}

and

HCl

Explanation:

${MnO}_{2} + 4 HCl \to {MnCl}_{2} + {Cl}_{2} + 2 H_{2} O$

CHXI11:THE P-BLOCK ELEMENTS

316358 Assertion :
Chlorine undergoes disproportionation reaction in alkaline medium.
Reason :
${Cl}_{2}$ is an oxidising agent.

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:

$C l_{2} + 2 NaO H_{(dil)} \overset{cold}{\to} NaCl + NaOCl + H_{2} O$
$3 {Cl}_{2} + 6 {NaOH}_{(conc)} \overset{heat}{\to}$
$5 NaCl + {NaClO}_{3} + 3 H_{2} O$
Chlorine is simultaneously reduced to
chloride ion $({Cl}^{-})$ and is oxidised to either ${ClO}^{-}$
or ${ClO}_{3}^{-}$ ion. Halogens (e.g., $Cl$ ) have a strong tendency to accept electrons. Thus, they act as strong oxidising agents. So option (2) is correct.

CHXI11:THE P-BLOCK ELEMENTS

316359 Concentrated hydrochloric acid when kept in open air sometimes produces a cloud of white fumes. The explanation for it is that

1 Concentrated hydrochloric acid emits strongly smelling HCl gas all the time

2 Oxygen in air reacts with the emitted HCl gas to form a cloud of chlorine gas

3 Strong affinity of HCl gas for moisture in air results in forming of droplets of liquid solution which appears like a cloudy smoke

4 Due to strong affinity for water, concentrated hydrochloric acid pulls moisture of air towards itself. This moisture forms droplets of water and hence the cloud.

Explanation:

$4 HCl + O_{2} ⟶ 2 {Cl}_{2} + 2 H_{2} O$
Appearance of cloud is due to formation of chlorine.

CHXI11:THE P-BLOCK ELEMENTS

316360 Assertion :
$NaCl$ reacts with concentrated $H_{2} {SO}_{4}$ to give colourless fumes with pungent smell. But on adding ${MnO}_{2}$ the fumes become greenish yellow.
Reason :
${MnO}_{2}$ oxidises $HCl$ to chlorine gas which is greenish yellow.

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 Both Assertion and Reason are incorrect.

Explanation:

$NaCl$ reacts with concentrated $H_{2} {SO}_{4}$ to give colourless fumes with pungent smell. This pungent smell is due to foramtion of $HCl$ .
$NaCl + H_{2} {SO}_{4} \to {Na}_{2} {SO}_{4} + 2 HCl$
But on adding ${MnO}_{2}$ , the fumes become greenish yellow due to formation of chlorine gas.

AIIMS - 2018

CHXI11:THE P-BLOCK ELEMENTS

316357 Chlorine is prepared in the laboratory by the action of

1

Zn

and

HCl

2

{CaCO}_{3}

and

HCl

3

Pb {({NO}_{3})}_{2}

and

HCl

4

{MnO}_{2}

and

HCl

Explanation:

${MnO}_{2} + 4 HCl \to {MnCl}_{2} + {Cl}_{2} + 2 H_{2} O$

CHXI11:THE P-BLOCK ELEMENTS

316358 Assertion :
Chlorine undergoes disproportionation reaction in alkaline medium.
Reason :
${Cl}_{2}$ is an oxidising agent.

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:

$C l_{2} + 2 NaO H_{(dil)} \overset{cold}{\to} NaCl + NaOCl + H_{2} O$
$3 {Cl}_{2} + 6 {NaOH}_{(conc)} \overset{heat}{\to}$
$5 NaCl + {NaClO}_{3} + 3 H_{2} O$
Chlorine is simultaneously reduced to
chloride ion $({Cl}^{-})$ and is oxidised to either ${ClO}^{-}$
or ${ClO}_{3}^{-}$ ion. Halogens (e.g., $Cl$ ) have a strong tendency to accept electrons. Thus, they act as strong oxidising agents. So option (2) is correct.

CHXI11:THE P-BLOCK ELEMENTS

316359 Concentrated hydrochloric acid when kept in open air sometimes produces a cloud of white fumes. The explanation for it is that

1 Concentrated hydrochloric acid emits strongly smelling HCl gas all the time

2 Oxygen in air reacts with the emitted HCl gas to form a cloud of chlorine gas

3 Strong affinity of HCl gas for moisture in air results in forming of droplets of liquid solution which appears like a cloudy smoke

4 Due to strong affinity for water, concentrated hydrochloric acid pulls moisture of air towards itself. This moisture forms droplets of water and hence the cloud.

Explanation:

$4 HCl + O_{2} ⟶ 2 {Cl}_{2} + 2 H_{2} O$
Appearance of cloud is due to formation of chlorine.

CHXI11:THE P-BLOCK ELEMENTS

316360 Assertion :
$NaCl$ reacts with concentrated $H_{2} {SO}_{4}$ to give colourless fumes with pungent smell. But on adding ${MnO}_{2}$ the fumes become greenish yellow.
Reason :
${MnO}_{2}$ oxidises $HCl$ to chlorine gas which is greenish yellow.

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 Both Assertion and Reason are incorrect.

Explanation:

$NaCl$ reacts with concentrated $H_{2} {SO}_{4}$ to give colourless fumes with pungent smell. This pungent smell is due to foramtion of $HCl$ .
$NaCl + H_{2} {SO}_{4} \to {Na}_{2} {SO}_{4} + 2 HCl$
But on adding ${MnO}_{2}$ , the fumes become greenish yellow due to formation of chlorine gas.

AIIMS - 2018

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