QBManager

CHXI11:THE P-BLOCK ELEMENTS

316917 Lead pipes can be used safely for carrying

1 soft water

2 soft water first heated with limestone

3 conc.

{HNO}_{3}

4 soft as well as hard water

Explanation:

Soft water first heated with limestone $({CaCO}_{3})$ contains some dissolved ${CO}_{3}^{2 -}$ ions in it which can form a coating of insoluble lead carbonate on the surface of lead pipe and protect it from further action.

CHXI11:THE P-BLOCK ELEMENTS

316918 The lead of the lead pencils melts at

1

2000^{\circ} C

2

350^{\circ} C

3

3170^{\circ} C

4

75^{\circ} C

Explanation:

The lead of lead pencils is made up of graphite (an allotrope of carbon), melting point of which is $3160^{\circ} C$ .
Hence, lead of lead pencils melts at $3170^{\circ} C$ .

AIIMS - 2009

CHXI11:THE P-BLOCK ELEMENTS

316919 Which statement is correct regarding the diagonal relationship between Be and Al ?
(I) Both carbides on hydrolysis produces ${CH}_{4}$ gas
(II) Both Be and Al oxides are amphoteric in nature.
(III) In vapour state, chlorides of both exist as chlorobridge dimer having $(3 c - 4 e)$ bonds
(IV) Both Be and Al nitrides on hydrolysis give ${NH}_{3}$ gas.

1 I, II are correct

2 I, III are correct

3 I, II, III, IV are correct

4 Only III is correct

Explanation:

(I) ${Be}_{2} C$ and ${Al}_{4} C_{3}$ are methanides ${Be}_{2} C + 4 H_{2} O \to 2 Be (OH)_{2} + {CH}_{4}$ ${Al}_{4} C_{3} + 12 H_{2} O \to 4 Al (OH)_{3} + 3 {CH}_{4}$
(II) $BeO, {Al}_{2} O_{3}$ are amphoteric in nature
(III) ${BeCl}_{2}$ and ${AlCl}_{3}$ both form dimers with $(3 c - 4 e)$ bond.
$\begin{matrix} (IV) {Be}_{3} N_{2} \\ AlN \end{matrix}}$ on hydrolysis produces ammonia
${Be}_{3} N_{2} + 6 H_{2} O \to 3 Be (OH)_{2} + 2 {NH}_{3}$
$AlN + 3 H_{2} O \to Al (OH)_{3} + {NH}_{3}$

CHXI11:THE P-BLOCK ELEMENTS

316920 Tin cry refers to

1 Conversion of white to grey tin

2 Tin plating

3 Conversion of white tetrahedral tin to white rhombohedral tin.

4 Emission of sound while bending a tin rod.

CHXI11:THE P-BLOCK ELEMENTS

316917 Lead pipes can be used safely for carrying

1 soft water

2 soft water first heated with limestone

3 conc.

{HNO}_{3}

4 soft as well as hard water

Explanation:

Soft water first heated with limestone $({CaCO}_{3})$ contains some dissolved ${CO}_{3}^{2 -}$ ions in it which can form a coating of insoluble lead carbonate on the surface of lead pipe and protect it from further action.

CHXI11:THE P-BLOCK ELEMENTS

316918 The lead of the lead pencils melts at

1

2000^{\circ} C

2

350^{\circ} C

3

3170^{\circ} C

4

75^{\circ} C

Explanation:

The lead of lead pencils is made up of graphite (an allotrope of carbon), melting point of which is $3160^{\circ} C$ .
Hence, lead of lead pencils melts at $3170^{\circ} C$ .

AIIMS - 2009

CHXI11:THE P-BLOCK ELEMENTS

316919 Which statement is correct regarding the diagonal relationship between Be and Al ?
(I) Both carbides on hydrolysis produces ${CH}_{4}$ gas
(II) Both Be and Al oxides are amphoteric in nature.
(III) In vapour state, chlorides of both exist as chlorobridge dimer having $(3 c - 4 e)$ bonds
(IV) Both Be and Al nitrides on hydrolysis give ${NH}_{3}$ gas.

1 I, II are correct

2 I, III are correct

3 I, II, III, IV are correct

4 Only III is correct

Explanation:

(I) ${Be}_{2} C$ and ${Al}_{4} C_{3}$ are methanides ${Be}_{2} C + 4 H_{2} O \to 2 Be (OH)_{2} + {CH}_{4}$ ${Al}_{4} C_{3} + 12 H_{2} O \to 4 Al (OH)_{3} + 3 {CH}_{4}$
(II) $BeO, {Al}_{2} O_{3}$ are amphoteric in nature
(III) ${BeCl}_{2}$ and ${AlCl}_{3}$ both form dimers with $(3 c - 4 e)$ bond.
$\begin{matrix} (IV) {Be}_{3} N_{2} \\ AlN \end{matrix}}$ on hydrolysis produces ammonia
${Be}_{3} N_{2} + 6 H_{2} O \to 3 Be (OH)_{2} + 2 {NH}_{3}$
$AlN + 3 H_{2} O \to Al (OH)_{3} + {NH}_{3}$

CHXI11:THE P-BLOCK ELEMENTS

316920 Tin cry refers to

1 Conversion of white to grey tin

2 Tin plating

3 Conversion of white tetrahedral tin to white rhombohedral tin.

4 Emission of sound while bending a tin rod.

CHXI11:THE P-BLOCK ELEMENTS

316917 Lead pipes can be used safely for carrying

1 soft water

2 soft water first heated with limestone

3 conc.

{HNO}_{3}

4 soft as well as hard water

Explanation:

Soft water first heated with limestone $({CaCO}_{3})$ contains some dissolved ${CO}_{3}^{2 -}$ ions in it which can form a coating of insoluble lead carbonate on the surface of lead pipe and protect it from further action.

CHXI11:THE P-BLOCK ELEMENTS

316918 The lead of the lead pencils melts at

1

2000^{\circ} C

2

350^{\circ} C

3

3170^{\circ} C

4

75^{\circ} C

Explanation:

The lead of lead pencils is made up of graphite (an allotrope of carbon), melting point of which is $3160^{\circ} C$ .
Hence, lead of lead pencils melts at $3170^{\circ} C$ .

AIIMS - 2009

CHXI11:THE P-BLOCK ELEMENTS

316919 Which statement is correct regarding the diagonal relationship between Be and Al ?
(I) Both carbides on hydrolysis produces ${CH}_{4}$ gas
(II) Both Be and Al oxides are amphoteric in nature.
(III) In vapour state, chlorides of both exist as chlorobridge dimer having $(3 c - 4 e)$ bonds
(IV) Both Be and Al nitrides on hydrolysis give ${NH}_{3}$ gas.

1 I, II are correct

2 I, III are correct

3 I, II, III, IV are correct

4 Only III is correct

Explanation:

(I) ${Be}_{2} C$ and ${Al}_{4} C_{3}$ are methanides ${Be}_{2} C + 4 H_{2} O \to 2 Be (OH)_{2} + {CH}_{4}$ ${Al}_{4} C_{3} + 12 H_{2} O \to 4 Al (OH)_{3} + 3 {CH}_{4}$
(II) $BeO, {Al}_{2} O_{3}$ are amphoteric in nature
(III) ${BeCl}_{2}$ and ${AlCl}_{3}$ both form dimers with $(3 c - 4 e)$ bond.
$\begin{matrix} (IV) {Be}_{3} N_{2} \\ AlN \end{matrix}}$ on hydrolysis produces ammonia
${Be}_{3} N_{2} + 6 H_{2} O \to 3 Be (OH)_{2} + 2 {NH}_{3}$
$AlN + 3 H_{2} O \to Al (OH)_{3} + {NH}_{3}$

CHXI11:THE P-BLOCK ELEMENTS

316920 Tin cry refers to

1 Conversion of white to grey tin

2 Tin plating

3 Conversion of white tetrahedral tin to white rhombohedral tin.

4 Emission of sound while bending a tin rod.

CHXI11:THE P-BLOCK ELEMENTS

316917 Lead pipes can be used safely for carrying

1 soft water

2 soft water first heated with limestone

3 conc.

{HNO}_{3}

4 soft as well as hard water

Explanation:

Soft water first heated with limestone $({CaCO}_{3})$ contains some dissolved ${CO}_{3}^{2 -}$ ions in it which can form a coating of insoluble lead carbonate on the surface of lead pipe and protect it from further action.

CHXI11:THE P-BLOCK ELEMENTS

316918 The lead of the lead pencils melts at

1

2000^{\circ} C

2

350^{\circ} C

3

3170^{\circ} C

4

75^{\circ} C

Explanation:

The lead of lead pencils is made up of graphite (an allotrope of carbon), melting point of which is $3160^{\circ} C$ .
Hence, lead of lead pencils melts at $3170^{\circ} C$ .

AIIMS - 2009

CHXI11:THE P-BLOCK ELEMENTS

316919 Which statement is correct regarding the diagonal relationship between Be and Al ?
(I) Both carbides on hydrolysis produces ${CH}_{4}$ gas
(II) Both Be and Al oxides are amphoteric in nature.
(III) In vapour state, chlorides of both exist as chlorobridge dimer having $(3 c - 4 e)$ bonds
(IV) Both Be and Al nitrides on hydrolysis give ${NH}_{3}$ gas.

1 I, II are correct

2 I, III are correct

3 I, II, III, IV are correct

4 Only III is correct

Explanation:

(I) ${Be}_{2} C$ and ${Al}_{4} C_{3}$ are methanides ${Be}_{2} C + 4 H_{2} O \to 2 Be (OH)_{2} + {CH}_{4}$ ${Al}_{4} C_{3} + 12 H_{2} O \to 4 Al (OH)_{3} + 3 {CH}_{4}$
(II) $BeO, {Al}_{2} O_{3}$ are amphoteric in nature
(III) ${BeCl}_{2}$ and ${AlCl}_{3}$ both form dimers with $(3 c - 4 e)$ bond.
$\begin{matrix} (IV) {Be}_{3} N_{2} \\ AlN \end{matrix}}$ on hydrolysis produces ammonia
${Be}_{3} N_{2} + 6 H_{2} O \to 3 Be (OH)_{2} + 2 {NH}_{3}$
$AlN + 3 H_{2} O \to Al (OH)_{3} + {NH}_{3}$

CHXI11:THE P-BLOCK ELEMENTS

316920 Tin cry refers to

1 Conversion of white to grey tin

2 Tin plating

3 Conversion of white tetrahedral tin to white rhombohedral tin.

4 Emission of sound while bending a tin rod.

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