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CHXI11:THE P-BLOCK ELEMENTS

316867 In cigarette lighters ____ is used.

1 misch metal

2 Mg - alloy

3

{CeO}_{2}

4 pyrophoric alloy

CHXI11:THE P-BLOCK ELEMENTS

316868 The number of $P - O - P$ bridges in the structure of phosphorus pentoxide and phosphorus trioxide are, respectively

1 6, 5

2 5, 6

3 6, 6

4 5, 5

CHXI11:THE P-BLOCK ELEMENTS

316855 White phosphorus reacts with chlorine and the product hydrolyses in the presence of water. The mass of $HCl$ obtained by the hydrolysis of the product formed by the reaction of $62 g$ of white phosphorus with chlorine in the presence of water is

1

0.219 g

2

21.9 g

3

2.19 g

4

219 g

Explanation:

$P_{4} + 6 {Cl}_{2} \to 4 {PCl}_{3}$
$(P C l_{3} + 3 H_{2} O \to H_{3} P O_{3} + 3 H C l) \times 4$
$\overset{―}{P_{4} + 6 C l_{2} + 12 H_{2} O \to 4 H_{3} P O_{3} + 12 H C l}$
1 mol of white phosphorus produces $12 mol$ of $HCl$
$62 g$ of white phosphorus has been taken which is equivalent to $\frac{62}{124} = \frac{1}{2} m o l$ .
Therefore $6 mol HCl$ will be formed
Mass of $6 mol HCl = 6 \times 36.5 = 219.0 g HCl$ .

CHXI11:THE P-BLOCK ELEMENTS

316856 Which of the following statement is incorrect

1 hypophosphorous acid reduces silver nitrate to silver

2 in solid state

{PCl}_{5}

exists as

{[{PCl}_{4}]}^{+} {[{PCl}_{6}]}^{-}

3 pure phosphine is non-inflammable

4 phosphorous acid on heating disproportionates to give metal phosphoric acid and phosphine

Explanation:

$\underset{\begin{matrix} Phosphorous \\ acid \end{matrix}}{4 H_{3} {PO}_{3}} \overset{200^{\circ} C}{⟶} \underset{\begin{matrix} Orthophosphoric \\ acid \end{matrix}}{3 H_{3} {PO}_{4}} + \underset{Phosphine}{{PH}_{3}}$

KCET - 2014

CHXI11:THE P-BLOCK ELEMENTS

316867 In cigarette lighters ____ is used.

1 misch metal

2 Mg - alloy

3

{CeO}_{2}

4 pyrophoric alloy

CHXI11:THE P-BLOCK ELEMENTS

316868 The number of $P - O - P$ bridges in the structure of phosphorus pentoxide and phosphorus trioxide are, respectively

1 6, 5

2 5, 6

3 6, 6

4 5, 5

CHXI11:THE P-BLOCK ELEMENTS

316855 White phosphorus reacts with chlorine and the product hydrolyses in the presence of water. The mass of $HCl$ obtained by the hydrolysis of the product formed by the reaction of $62 g$ of white phosphorus with chlorine in the presence of water is

1

0.219 g

2

21.9 g

3

2.19 g

4

219 g

Explanation:

$P_{4} + 6 {Cl}_{2} \to 4 {PCl}_{3}$
$(P C l_{3} + 3 H_{2} O \to H_{3} P O_{3} + 3 H C l) \times 4$
$\overset{―}{P_{4} + 6 C l_{2} + 12 H_{2} O \to 4 H_{3} P O_{3} + 12 H C l}$
1 mol of white phosphorus produces $12 mol$ of $HCl$
$62 g$ of white phosphorus has been taken which is equivalent to $\frac{62}{124} = \frac{1}{2} m o l$ .
Therefore $6 mol HCl$ will be formed
Mass of $6 mol HCl = 6 \times 36.5 = 219.0 g HCl$ .

CHXI11:THE P-BLOCK ELEMENTS

316856 Which of the following statement is incorrect

1 hypophosphorous acid reduces silver nitrate to silver

2 in solid state

{PCl}_{5}

exists as

{[{PCl}_{4}]}^{+} {[{PCl}_{6}]}^{-}

3 pure phosphine is non-inflammable

4 phosphorous acid on heating disproportionates to give metal phosphoric acid and phosphine

Explanation:

$\underset{\begin{matrix} Phosphorous \\ acid \end{matrix}}{4 H_{3} {PO}_{3}} \overset{200^{\circ} C}{⟶} \underset{\begin{matrix} Orthophosphoric \\ acid \end{matrix}}{3 H_{3} {PO}_{4}} + \underset{Phosphine}{{PH}_{3}}$

KCET - 2014

CHXI11:THE P-BLOCK ELEMENTS

316867 In cigarette lighters ____ is used.

1 misch metal

2 Mg - alloy

3

{CeO}_{2}

4 pyrophoric alloy

CHXI11:THE P-BLOCK ELEMENTS

316868 The number of $P - O - P$ bridges in the structure of phosphorus pentoxide and phosphorus trioxide are, respectively

1 6, 5

2 5, 6

3 6, 6

4 5, 5

CHXI11:THE P-BLOCK ELEMENTS

316855 White phosphorus reacts with chlorine and the product hydrolyses in the presence of water. The mass of $HCl$ obtained by the hydrolysis of the product formed by the reaction of $62 g$ of white phosphorus with chlorine in the presence of water is

1

0.219 g

2

21.9 g

3

2.19 g

4

219 g

Explanation:

$P_{4} + 6 {Cl}_{2} \to 4 {PCl}_{3}$
$(P C l_{3} + 3 H_{2} O \to H_{3} P O_{3} + 3 H C l) \times 4$
$\overset{―}{P_{4} + 6 C l_{2} + 12 H_{2} O \to 4 H_{3} P O_{3} + 12 H C l}$
1 mol of white phosphorus produces $12 mol$ of $HCl$
$62 g$ of white phosphorus has been taken which is equivalent to $\frac{62}{124} = \frac{1}{2} m o l$ .
Therefore $6 mol HCl$ will be formed
Mass of $6 mol HCl = 6 \times 36.5 = 219.0 g HCl$ .

CHXI11:THE P-BLOCK ELEMENTS

316856 Which of the following statement is incorrect

1 hypophosphorous acid reduces silver nitrate to silver

2 in solid state

{PCl}_{5}

exists as

{[{PCl}_{4}]}^{+} {[{PCl}_{6}]}^{-}

3 pure phosphine is non-inflammable

4 phosphorous acid on heating disproportionates to give metal phosphoric acid and phosphine

Explanation:

$\underset{\begin{matrix} Phosphorous \\ acid \end{matrix}}{4 H_{3} {PO}_{3}} \overset{200^{\circ} C}{⟶} \underset{\begin{matrix} Orthophosphoric \\ acid \end{matrix}}{3 H_{3} {PO}_{4}} + \underset{Phosphine}{{PH}_{3}}$

KCET - 2014

CHXI11:THE P-BLOCK ELEMENTS

316867 In cigarette lighters ____ is used.

1 misch metal

2 Mg - alloy

3

{CeO}_{2}

4 pyrophoric alloy

CHXI11:THE P-BLOCK ELEMENTS

316868 The number of $P - O - P$ bridges in the structure of phosphorus pentoxide and phosphorus trioxide are, respectively

1 6, 5

2 5, 6

3 6, 6

4 5, 5

CHXI11:THE P-BLOCK ELEMENTS

316855 White phosphorus reacts with chlorine and the product hydrolyses in the presence of water. The mass of $HCl$ obtained by the hydrolysis of the product formed by the reaction of $62 g$ of white phosphorus with chlorine in the presence of water is

1

0.219 g

2

21.9 g

3

2.19 g

4

219 g

Explanation:

$P_{4} + 6 {Cl}_{2} \to 4 {PCl}_{3}$
$(P C l_{3} + 3 H_{2} O \to H_{3} P O_{3} + 3 H C l) \times 4$
$\overset{―}{P_{4} + 6 C l_{2} + 12 H_{2} O \to 4 H_{3} P O_{3} + 12 H C l}$
1 mol of white phosphorus produces $12 mol$ of $HCl$
$62 g$ of white phosphorus has been taken which is equivalent to $\frac{62}{124} = \frac{1}{2} m o l$ .
Therefore $6 mol HCl$ will be formed
Mass of $6 mol HCl = 6 \times 36.5 = 219.0 g HCl$ .

CHXI11:THE P-BLOCK ELEMENTS

316856 Which of the following statement is incorrect

1 hypophosphorous acid reduces silver nitrate to silver

2 in solid state

{PCl}_{5}

exists as

{[{PCl}_{4}]}^{+} {[{PCl}_{6}]}^{-}

3 pure phosphine is non-inflammable

4 phosphorous acid on heating disproportionates to give metal phosphoric acid and phosphine

Explanation:

$\underset{\begin{matrix} Phosphorous \\ acid \end{matrix}}{4 H_{3} {PO}_{3}} \overset{200^{\circ} C}{⟶} \underset{\begin{matrix} Orthophosphoric \\ acid \end{matrix}}{3 H_{3} {PO}_{4}} + \underset{Phosphine}{{PH}_{3}}$

KCET - 2014

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