QBManager

11. THE P-BLOCK ELEMENTS

189652 When $A l$ is added to $K O H$ solution

1 No action takes place

2 Oxygen is evolved

3 Water is produced

4 Hydrogen is evolved

Explanation:

(d) $2 K O H + 2 A l + 2 H_{2} O \to 2 K A l O_{2} + 3 H_{2}$

11. THE P-BLOCK ELEMENTS

190059 Identify the correct statement for $B_{2} H_{6}$ from those given below. $(A)$ In $B_{2} H_{6}$ , all $B - H$ bonds are equivalent. $(B)$ In $B_{2} H_{6}$ there are four $3 -$ centre $- 2 -$ electron bonds. $(C)$ $B_{2} H_{6}$ is a Lewis acid. $(D)$ $B_{2} H_{6}$ can be synthesized form both $B F_{3}$ and $N a B H_{4}$ . $(E)$ $B_{2} H_{6}$ is a planar molecule.Choose the most appropriate answer from the options given below..... .

1

(A)

and

(E)

only

2

(B), (C)

and

(E)

only

3

(C)

and

(D)

only

4

(C)

and

(E)

only

Explanation:

$(A) (B)$ Two $3$ centre $- 2$ -electron bonds
$(C)$ $B_{2} H_{6}$ is $e^{-}$ deficient species
$(E)$ $B_{2} H_{6}$ is non - Planar molecule
$(D)$ $B F_{3} + L i A l H_{4} \to 2 B_{2} H_{6} + 3 L i F + 3 A l F_{3}$
$N a B H_{4} + I_{2} \to B_{2} H_{6} + 2 N a I + H_{2}$ 208690-s

11. THE P-BLOCK ELEMENTS

190060 Choose the correct stability order of group $13$ elements in their $+ 1$ oxidation state.

1

A l < G a < I n < T l

2

T l < I n < G a < A l

3

A l < G a < T l < I n

4

A l < T l < G a < I n

Explanation:

Moving down the group stability of lower oxidation state increases
$A l < G a < I n < T l$

11. THE P-BLOCK ELEMENTS

190062 Match List $- I$ with List $- I I$ List $- I$
(Si-Compounds)

List $- I I$
(Si-Polymeric/other products)

$(A)$ ${(C H_{3})}_{4} S i$
$(I)$ Chain silicone

$(B)$ $(C H_{3}) S i (O H)_{3}$
$(I I)$ Dimeric silicone

$(C)$ ${(C H_{3})}_{2} S i (O H)_{2}$
$(I I I)$ Silane

$(D)$ ${(C H_{3})}_{3} S i (O H)$
$(I V)$ $2 D$ - SiliconeChoose the correct answer from the options given below

1

(A) - (I I I), (B) - (I I), (C) - (I), (D) - (I V)

2

(A) - (I V), (B) - (I), (C) - (I I), (D) - (I I I)

3

(A) - (I I), (B) - (I), (C) - (I V), (D) - (I I I)

4

(A) - (I I I), (B) - (I V), (C) - (I), (D) - (I I)

Explanation:

${(C H_{3})}_{4} S i$ is a silane
$(C H_{3}) S i (O H)_{3}$ polymerise to form 2D silicone
${(C H_{3})}_{2} S i (O H)_{2}$ polymerise to form chain silicone
${(C H_{3})}_{3} S i (O H)$ form dimer ${(C H_{3})}_{3} S i - O - S i {(C H_{3})}_{3}$

11. THE P-BLOCK ELEMENTS

189652 When $A l$ is added to $K O H$ solution

1 No action takes place

2 Oxygen is evolved

3 Water is produced

4 Hydrogen is evolved

Explanation:

(d) $2 K O H + 2 A l + 2 H_{2} O \to 2 K A l O_{2} + 3 H_{2}$

11. THE P-BLOCK ELEMENTS

190059 Identify the correct statement for $B_{2} H_{6}$ from those given below. $(A)$ In $B_{2} H_{6}$ , all $B - H$ bonds are equivalent. $(B)$ In $B_{2} H_{6}$ there are four $3 -$ centre $- 2 -$ electron bonds. $(C)$ $B_{2} H_{6}$ is a Lewis acid. $(D)$ $B_{2} H_{6}$ can be synthesized form both $B F_{3}$ and $N a B H_{4}$ . $(E)$ $B_{2} H_{6}$ is a planar molecule.Choose the most appropriate answer from the options given below..... .

1

(A)

and

(E)

only

2

(B), (C)

and

(E)

only

3

(C)

and

(D)

only

4

(C)

and

(E)

only

Explanation:

$(A) (B)$ Two $3$ centre $- 2$ -electron bonds
$(C)$ $B_{2} H_{6}$ is $e^{-}$ deficient species
$(E)$ $B_{2} H_{6}$ is non - Planar molecule
$(D)$ $B F_{3} + L i A l H_{4} \to 2 B_{2} H_{6} + 3 L i F + 3 A l F_{3}$
$N a B H_{4} + I_{2} \to B_{2} H_{6} + 2 N a I + H_{2}$ 208690-s

11. THE P-BLOCK ELEMENTS

190060 Choose the correct stability order of group $13$ elements in their $+ 1$ oxidation state.

1

A l < G a < I n < T l

2

T l < I n < G a < A l

3

A l < G a < T l < I n

4

A l < T l < G a < I n

Explanation:

Moving down the group stability of lower oxidation state increases
$A l < G a < I n < T l$

11. THE P-BLOCK ELEMENTS

190062 Match List $- I$ with List $- I I$ List $- I$
(Si-Compounds)

List $- I I$
(Si-Polymeric/other products)

$(A)$ ${(C H_{3})}_{4} S i$
$(I)$ Chain silicone

$(B)$ $(C H_{3}) S i (O H)_{3}$
$(I I)$ Dimeric silicone

$(C)$ ${(C H_{3})}_{2} S i (O H)_{2}$
$(I I I)$ Silane

$(D)$ ${(C H_{3})}_{3} S i (O H)$
$(I V)$ $2 D$ - SiliconeChoose the correct answer from the options given below

1

(A) - (I I I), (B) - (I I), (C) - (I), (D) - (I V)

2

(A) - (I V), (B) - (I), (C) - (I I), (D) - (I I I)

3

(A) - (I I), (B) - (I), (C) - (I V), (D) - (I I I)

4

(A) - (I I I), (B) - (I V), (C) - (I), (D) - (I I)

Explanation:

${(C H_{3})}_{4} S i$ is a silane
$(C H_{3}) S i (O H)_{3}$ polymerise to form 2D silicone
${(C H_{3})}_{2} S i (O H)_{2}$ polymerise to form chain silicone
${(C H_{3})}_{3} S i (O H)$ form dimer ${(C H_{3})}_{3} S i - O - S i {(C H_{3})}_{3}$

11. THE P-BLOCK ELEMENTS

189652 When $A l$ is added to $K O H$ solution

1 No action takes place

2 Oxygen is evolved

3 Water is produced

4 Hydrogen is evolved

Explanation:

(d) $2 K O H + 2 A l + 2 H_{2} O \to 2 K A l O_{2} + 3 H_{2}$

11. THE P-BLOCK ELEMENTS

190059 Identify the correct statement for $B_{2} H_{6}$ from those given below. $(A)$ In $B_{2} H_{6}$ , all $B - H$ bonds are equivalent. $(B)$ In $B_{2} H_{6}$ there are four $3 -$ centre $- 2 -$ electron bonds. $(C)$ $B_{2} H_{6}$ is a Lewis acid. $(D)$ $B_{2} H_{6}$ can be synthesized form both $B F_{3}$ and $N a B H_{4}$ . $(E)$ $B_{2} H_{6}$ is a planar molecule.Choose the most appropriate answer from the options given below..... .

1

(A)

and

(E)

only

2

(B), (C)

and

(E)

only

3

(C)

and

(D)

only

4

(C)

and

(E)

only

Explanation:

$(A) (B)$ Two $3$ centre $- 2$ -electron bonds
$(C)$ $B_{2} H_{6}$ is $e^{-}$ deficient species
$(E)$ $B_{2} H_{6}$ is non - Planar molecule
$(D)$ $B F_{3} + L i A l H_{4} \to 2 B_{2} H_{6} + 3 L i F + 3 A l F_{3}$
$N a B H_{4} + I_{2} \to B_{2} H_{6} + 2 N a I + H_{2}$ 208690-s

11. THE P-BLOCK ELEMENTS

190060 Choose the correct stability order of group $13$ elements in their $+ 1$ oxidation state.

1

A l < G a < I n < T l

2

T l < I n < G a < A l

3

A l < G a < T l < I n

4

A l < T l < G a < I n

Explanation:

Moving down the group stability of lower oxidation state increases
$A l < G a < I n < T l$

11. THE P-BLOCK ELEMENTS

190062 Match List $- I$ with List $- I I$ List $- I$
(Si-Compounds)

List $- I I$
(Si-Polymeric/other products)

$(A)$ ${(C H_{3})}_{4} S i$
$(I)$ Chain silicone

$(B)$ $(C H_{3}) S i (O H)_{3}$
$(I I)$ Dimeric silicone

$(C)$ ${(C H_{3})}_{2} S i (O H)_{2}$
$(I I I)$ Silane

$(D)$ ${(C H_{3})}_{3} S i (O H)$
$(I V)$ $2 D$ - SiliconeChoose the correct answer from the options given below

1

(A) - (I I I), (B) - (I I), (C) - (I), (D) - (I V)

2

(A) - (I V), (B) - (I), (C) - (I I), (D) - (I I I)

3

(A) - (I I), (B) - (I), (C) - (I V), (D) - (I I I)

4

(A) - (I I I), (B) - (I V), (C) - (I), (D) - (I I)

Explanation:

${(C H_{3})}_{4} S i$ is a silane
$(C H_{3}) S i (O H)_{3}$ polymerise to form 2D silicone
${(C H_{3})}_{2} S i (O H)_{2}$ polymerise to form chain silicone
${(C H_{3})}_{3} S i (O H)$ form dimer ${(C H_{3})}_{3} S i - O - S i {(C H_{3})}_{3}$

11. THE P-BLOCK ELEMENTS

189652 When $A l$ is added to $K O H$ solution

1 No action takes place

2 Oxygen is evolved

3 Water is produced

4 Hydrogen is evolved

Explanation:

(d) $2 K O H + 2 A l + 2 H_{2} O \to 2 K A l O_{2} + 3 H_{2}$

11. THE P-BLOCK ELEMENTS

190059 Identify the correct statement for $B_{2} H_{6}$ from those given below. $(A)$ In $B_{2} H_{6}$ , all $B - H$ bonds are equivalent. $(B)$ In $B_{2} H_{6}$ there are four $3 -$ centre $- 2 -$ electron bonds. $(C)$ $B_{2} H_{6}$ is a Lewis acid. $(D)$ $B_{2} H_{6}$ can be synthesized form both $B F_{3}$ and $N a B H_{4}$ . $(E)$ $B_{2} H_{6}$ is a planar molecule.Choose the most appropriate answer from the options given below..... .

1

(A)

and

(E)

only

2

(B), (C)

and

(E)

only

3

(C)

and

(D)

only

4

(C)

and

(E)

only

Explanation:

$(A) (B)$ Two $3$ centre $- 2$ -electron bonds
$(C)$ $B_{2} H_{6}$ is $e^{-}$ deficient species
$(E)$ $B_{2} H_{6}$ is non - Planar molecule
$(D)$ $B F_{3} + L i A l H_{4} \to 2 B_{2} H_{6} + 3 L i F + 3 A l F_{3}$
$N a B H_{4} + I_{2} \to B_{2} H_{6} + 2 N a I + H_{2}$ 208690-s

11. THE P-BLOCK ELEMENTS

190060 Choose the correct stability order of group $13$ elements in their $+ 1$ oxidation state.

1

A l < G a < I n < T l

2

T l < I n < G a < A l

3

A l < G a < T l < I n

4

A l < T l < G a < I n

Explanation:

Moving down the group stability of lower oxidation state increases
$A l < G a < I n < T l$

11. THE P-BLOCK ELEMENTS

190062 Match List $- I$ with List $- I I$ List $- I$
(Si-Compounds)

List $- I I$
(Si-Polymeric/other products)

$(A)$ ${(C H_{3})}_{4} S i$
$(I)$ Chain silicone

$(B)$ $(C H_{3}) S i (O H)_{3}$
$(I I)$ Dimeric silicone

$(C)$ ${(C H_{3})}_{2} S i (O H)_{2}$
$(I I I)$ Silane

$(D)$ ${(C H_{3})}_{3} S i (O H)$
$(I V)$ $2 D$ - SiliconeChoose the correct answer from the options given below

1

(A) - (I I I), (B) - (I I), (C) - (I), (D) - (I V)

2

(A) - (I V), (B) - (I), (C) - (I I), (D) - (I I I)

3

(A) - (I I), (B) - (I), (C) - (I V), (D) - (I I I)

4

(A) - (I I I), (B) - (I V), (C) - (I), (D) - (I I)

Explanation:

${(C H_{3})}_{4} S i$ is a silane
$(C H_{3}) S i (O H)_{3}$ polymerise to form 2D silicone
${(C H_{3})}_{2} S i (O H)_{2}$ polymerise to form chain silicone
${(C H_{3})}_{3} S i (O H)$ form dimer ${(C H_{3})}_{3} S i - O - S i {(C H_{3})}_{3}$

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