QBManager

CHXI11:THE P-BLOCK ELEMENTS

316198 Conc. ${HNO}_{3}$ is stored in containers made up of

1

Cu

2

Zn

3

Al

4

Sn

Explanation:

$Al$ is rendered passive by formation of a impervious layer of ${Al}_{2} O_{3}$ on its surface when brought in contact with conc. ${HNO}_{3}$ . $So, Al$ containers are used to store conc. ${HNO}_{3}$ .

CHXI11:THE P-BLOCK ELEMENTS

316234 In compounds of type ${ECl}_{3}$ , where $E = B, P$ , As or $Bi$ , the angles $Cl - E - Cl$ for different $E$ are in the order

1

B < P < A s < B i

2

B < P = A s = B i

3

B > P > A s > B i

4

B < P = A s = B i

Explanation:

$B > P > A s > B i$
As we go down the group bond angle decreases because repulsion between bonded pairs of electron decreases.

CHXI11:THE P-BLOCK ELEMENTS

316199 Which of the following reactions does not liberate gaseous product?

1

{AlCl}_{3} + NaOH \to

2

NaOH + P (

white

) + H_{2} O \to

3

Al + NaOH \overset{Δ}{\to}

4

Zn + NaOH \overset{Δ}{\to}

Explanation:

${AlCl}_{3} + 3 NaOH \to Al (OH)_{3} + 3 NaCl$
$P_{4} + 3 NaOH + 3 H_{2} O \to {PH}_{3} + 3 {NaH}_{2} {PO}_{2}$
$2 Al + 2 NaOH + 2 H_{2} O \to 2 {NaAlO}_{2} + 3 H_{2}$ $Zn + 2 NaOH \to {Na}_{2} {ZnO}_{2} + H_{2}$

CHXI11:THE P-BLOCK ELEMENTS

316200 Which of the following cannot undergo Lewis acid-base reaction with ${BF}_{3}$ ?

1

F^{-}

2

{NH}_{3}

3

{AlCl}_{3}

4

{(C_{2} H_{5})}_{2} O

Explanation:

Like $B F_{3}, AlC l_{3}$ is also electron deficient, so both these are lewis acids.

CHXI11:THE P-BLOCK ELEMENTS

316198 Conc. ${HNO}_{3}$ is stored in containers made up of

1

Cu

2

Zn

3

Al

4

Sn

Explanation:

$Al$ is rendered passive by formation of a impervious layer of ${Al}_{2} O_{3}$ on its surface when brought in contact with conc. ${HNO}_{3}$ . $So, Al$ containers are used to store conc. ${HNO}_{3}$ .

CHXI11:THE P-BLOCK ELEMENTS

316234 In compounds of type ${ECl}_{3}$ , where $E = B, P$ , As or $Bi$ , the angles $Cl - E - Cl$ for different $E$ are in the order

1

B < P < A s < B i

2

B < P = A s = B i

3

B > P > A s > B i

4

B < P = A s = B i

Explanation:

$B > P > A s > B i$
As we go down the group bond angle decreases because repulsion between bonded pairs of electron decreases.

CHXI11:THE P-BLOCK ELEMENTS

316199 Which of the following reactions does not liberate gaseous product?

1

{AlCl}_{3} + NaOH \to

2

NaOH + P (

white

) + H_{2} O \to

3

Al + NaOH \overset{Δ}{\to}

4

Zn + NaOH \overset{Δ}{\to}

Explanation:

${AlCl}_{3} + 3 NaOH \to Al (OH)_{3} + 3 NaCl$
$P_{4} + 3 NaOH + 3 H_{2} O \to {PH}_{3} + 3 {NaH}_{2} {PO}_{2}$
$2 Al + 2 NaOH + 2 H_{2} O \to 2 {NaAlO}_{2} + 3 H_{2}$ $Zn + 2 NaOH \to {Na}_{2} {ZnO}_{2} + H_{2}$

CHXI11:THE P-BLOCK ELEMENTS

316200 Which of the following cannot undergo Lewis acid-base reaction with ${BF}_{3}$ ?

1

F^{-}

2

{NH}_{3}

3

{AlCl}_{3}

4

{(C_{2} H_{5})}_{2} O

Explanation:

Like $B F_{3}, AlC l_{3}$ is also electron deficient, so both these are lewis acids.

CHXI11:THE P-BLOCK ELEMENTS

316198 Conc. ${HNO}_{3}$ is stored in containers made up of

1

Cu

2

Zn

3

Al

4

Sn

Explanation:

$Al$ is rendered passive by formation of a impervious layer of ${Al}_{2} O_{3}$ on its surface when brought in contact with conc. ${HNO}_{3}$ . $So, Al$ containers are used to store conc. ${HNO}_{3}$ .

CHXI11:THE P-BLOCK ELEMENTS

316234 In compounds of type ${ECl}_{3}$ , where $E = B, P$ , As or $Bi$ , the angles $Cl - E - Cl$ for different $E$ are in the order

1

B < P < A s < B i

2

B < P = A s = B i

3

B > P > A s > B i

4

B < P = A s = B i

Explanation:

$B > P > A s > B i$
As we go down the group bond angle decreases because repulsion between bonded pairs of electron decreases.

CHXI11:THE P-BLOCK ELEMENTS

316199 Which of the following reactions does not liberate gaseous product?

1

{AlCl}_{3} + NaOH \to

2

NaOH + P (

white

) + H_{2} O \to

3

Al + NaOH \overset{Δ}{\to}

4

Zn + NaOH \overset{Δ}{\to}

Explanation:

${AlCl}_{3} + 3 NaOH \to Al (OH)_{3} + 3 NaCl$
$P_{4} + 3 NaOH + 3 H_{2} O \to {PH}_{3} + 3 {NaH}_{2} {PO}_{2}$
$2 Al + 2 NaOH + 2 H_{2} O \to 2 {NaAlO}_{2} + 3 H_{2}$ $Zn + 2 NaOH \to {Na}_{2} {ZnO}_{2} + H_{2}$

CHXI11:THE P-BLOCK ELEMENTS

316200 Which of the following cannot undergo Lewis acid-base reaction with ${BF}_{3}$ ?

1

F^{-}

2

{NH}_{3}

3

{AlCl}_{3}

4

{(C_{2} H_{5})}_{2} O

Explanation:

Like $B F_{3}, AlC l_{3}$ is also electron deficient, so both these are lewis acids.

CHXI11:THE P-BLOCK ELEMENTS

316198 Conc. ${HNO}_{3}$ is stored in containers made up of

1

Cu

2

Zn

3

Al

4

Sn

Explanation:

$Al$ is rendered passive by formation of a impervious layer of ${Al}_{2} O_{3}$ on its surface when brought in contact with conc. ${HNO}_{3}$ . $So, Al$ containers are used to store conc. ${HNO}_{3}$ .

CHXI11:THE P-BLOCK ELEMENTS

316234 In compounds of type ${ECl}_{3}$ , where $E = B, P$ , As or $Bi$ , the angles $Cl - E - Cl$ for different $E$ are in the order

1

B < P < A s < B i

2

B < P = A s = B i

3

B > P > A s > B i

4

B < P = A s = B i

Explanation:

$B > P > A s > B i$
As we go down the group bond angle decreases because repulsion between bonded pairs of electron decreases.

CHXI11:THE P-BLOCK ELEMENTS

316199 Which of the following reactions does not liberate gaseous product?

1

{AlCl}_{3} + NaOH \to

2

NaOH + P (

white

) + H_{2} O \to

3

Al + NaOH \overset{Δ}{\to}

4

Zn + NaOH \overset{Δ}{\to}

Explanation:

${AlCl}_{3} + 3 NaOH \to Al (OH)_{3} + 3 NaCl$
$P_{4} + 3 NaOH + 3 H_{2} O \to {PH}_{3} + 3 {NaH}_{2} {PO}_{2}$
$2 Al + 2 NaOH + 2 H_{2} O \to 2 {NaAlO}_{2} + 3 H_{2}$ $Zn + 2 NaOH \to {Na}_{2} {ZnO}_{2} + H_{2}$

CHXI11:THE P-BLOCK ELEMENTS

316200 Which of the following cannot undergo Lewis acid-base reaction with ${BF}_{3}$ ?

1

F^{-}

2

{NH}_{3}

3

{AlCl}_{3}

4

{(C_{2} H_{5})}_{2} O

Explanation:

Like $B F_{3}, AlC l_{3}$ is also electron deficient, so both these are lewis acids.

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