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07. The p-BLOCK ELEMENTS (XII)

189336 Nitrous oxide is known as

1 Breathing gas

2 Laughing gas

3 exercising gas

4 Laboratory gas

07. The p-BLOCK ELEMENTS (XII)

189337 When lead nitrate is heated, it gives

1

N O_{2}

2

N O

3

N_{2} O_{5}

4

N_{2} O

Explanation:

(a) We know that,
$2 P b (N O_{3})_{2} \to 2 P b O + 4 N O_{2} + O_{2}$
So nitric oxide $N_{2} O$ is produced.

07. The p-BLOCK ELEMENTS (XII)

189338 Which element exist as a solid at $25^{o} C$ and $1$ atmospheric pressure among the following

1

B r

2

C l

3

H g

4

P

Explanation:

(d) Phosphorus exist as solid at $27^{o} C$ and $1$ atmospheric pressure (m.p. of white phosphorus = $44^{o} C$ )

07. The p-BLOCK ELEMENTS (XII)

189339 In the reaction $H N O_{3} + P_{4} O_{10} \to 4 H P O_{3} + x$ , the product $x$ is

1

N_{2} O_{3}

2

N_{2} O_{5}

3

N O_{2}

4

H_{2} O

Explanation:

(b) We know that, $4 H N O_{3} + P_{4} O_{10} \to 4 H P O_{3} + 2 N_{2} O_{5}$
The product is dinitrogen pentaoxide $(N_{2} O_{5})$ .

07. The p-BLOCK ELEMENTS (XII)

189340 The number of hydrogen atom (s) attached to phosphorus atom in hypophosphorous acid is

1 Zero

2 Two

3 One

4 Three

Explanation:

(b) Hypophosphorous acid is $H_{3} P O_{2}$ . 265-s228

07. The p-BLOCK ELEMENTS (XII)

189336 Nitrous oxide is known as

1 Breathing gas

2 Laughing gas

3 exercising gas

4 Laboratory gas

07. The p-BLOCK ELEMENTS (XII)

189337 When lead nitrate is heated, it gives

1

N O_{2}

2

N O

3

N_{2} O_{5}

4

N_{2} O

Explanation:

(a) We know that,
$2 P b (N O_{3})_{2} \to 2 P b O + 4 N O_{2} + O_{2}$
So nitric oxide $N_{2} O$ is produced.

07. The p-BLOCK ELEMENTS (XII)

189338 Which element exist as a solid at $25^{o} C$ and $1$ atmospheric pressure among the following

1

B r

2

C l

3

H g

4

P

Explanation:

(d) Phosphorus exist as solid at $27^{o} C$ and $1$ atmospheric pressure (m.p. of white phosphorus = $44^{o} C$ )

07. The p-BLOCK ELEMENTS (XII)

189339 In the reaction $H N O_{3} + P_{4} O_{10} \to 4 H P O_{3} + x$ , the product $x$ is

1

N_{2} O_{3}

2

N_{2} O_{5}

3

N O_{2}

4

H_{2} O

Explanation:

(b) We know that, $4 H N O_{3} + P_{4} O_{10} \to 4 H P O_{3} + 2 N_{2} O_{5}$
The product is dinitrogen pentaoxide $(N_{2} O_{5})$ .

07. The p-BLOCK ELEMENTS (XII)

189340 The number of hydrogen atom (s) attached to phosphorus atom in hypophosphorous acid is

1 Zero

2 Two

3 One

4 Three

Explanation:

(b) Hypophosphorous acid is $H_{3} P O_{2}$ . 265-s228

07. The p-BLOCK ELEMENTS (XII)

189336 Nitrous oxide is known as

1 Breathing gas

2 Laughing gas

3 exercising gas

4 Laboratory gas

07. The p-BLOCK ELEMENTS (XII)

189337 When lead nitrate is heated, it gives

1

N O_{2}

2

N O

3

N_{2} O_{5}

4

N_{2} O

Explanation:

(a) We know that,
$2 P b (N O_{3})_{2} \to 2 P b O + 4 N O_{2} + O_{2}$
So nitric oxide $N_{2} O$ is produced.

07. The p-BLOCK ELEMENTS (XII)

189338 Which element exist as a solid at $25^{o} C$ and $1$ atmospheric pressure among the following

1

B r

2

C l

3

H g

4

P

Explanation:

(d) Phosphorus exist as solid at $27^{o} C$ and $1$ atmospheric pressure (m.p. of white phosphorus = $44^{o} C$ )

07. The p-BLOCK ELEMENTS (XII)

189339 In the reaction $H N O_{3} + P_{4} O_{10} \to 4 H P O_{3} + x$ , the product $x$ is

1

N_{2} O_{3}

2

N_{2} O_{5}

3

N O_{2}

4

H_{2} O

Explanation:

(b) We know that, $4 H N O_{3} + P_{4} O_{10} \to 4 H P O_{3} + 2 N_{2} O_{5}$
The product is dinitrogen pentaoxide $(N_{2} O_{5})$ .

07. The p-BLOCK ELEMENTS (XII)

189340 The number of hydrogen atom (s) attached to phosphorus atom in hypophosphorous acid is

1 Zero

2 Two

3 One

4 Three

Explanation:

(b) Hypophosphorous acid is $H_{3} P O_{2}$ . 265-s228

07. The p-BLOCK ELEMENTS (XII)

189336 Nitrous oxide is known as

1 Breathing gas

2 Laughing gas

3 exercising gas

4 Laboratory gas

07. The p-BLOCK ELEMENTS (XII)

189337 When lead nitrate is heated, it gives

1

N O_{2}

2

N O

3

N_{2} O_{5}

4

N_{2} O

Explanation:

(a) We know that,
$2 P b (N O_{3})_{2} \to 2 P b O + 4 N O_{2} + O_{2}$
So nitric oxide $N_{2} O$ is produced.

07. The p-BLOCK ELEMENTS (XII)

189338 Which element exist as a solid at $25^{o} C$ and $1$ atmospheric pressure among the following

1

B r

2

C l

3

H g

4

P

Explanation:

(d) Phosphorus exist as solid at $27^{o} C$ and $1$ atmospheric pressure (m.p. of white phosphorus = $44^{o} C$ )

07. The p-BLOCK ELEMENTS (XII)

189339 In the reaction $H N O_{3} + P_{4} O_{10} \to 4 H P O_{3} + x$ , the product $x$ is

1

N_{2} O_{3}

2

N_{2} O_{5}

3

N O_{2}

4

H_{2} O

Explanation:

(b) We know that, $4 H N O_{3} + P_{4} O_{10} \to 4 H P O_{3} + 2 N_{2} O_{5}$
The product is dinitrogen pentaoxide $(N_{2} O_{5})$ .

07. The p-BLOCK ELEMENTS (XII)

189340 The number of hydrogen atom (s) attached to phosphorus atom in hypophosphorous acid is

1 Zero

2 Two

3 One

4 Three

Explanation:

(b) Hypophosphorous acid is $H_{3} P O_{2}$ . 265-s228

07. The p-BLOCK ELEMENTS (XII)

189336 Nitrous oxide is known as

1 Breathing gas

2 Laughing gas

3 exercising gas

4 Laboratory gas

07. The p-BLOCK ELEMENTS (XII)

189337 When lead nitrate is heated, it gives

1

N O_{2}

2

N O

3

N_{2} O_{5}

4

N_{2} O

Explanation:

(a) We know that,
$2 P b (N O_{3})_{2} \to 2 P b O + 4 N O_{2} + O_{2}$
So nitric oxide $N_{2} O$ is produced.

07. The p-BLOCK ELEMENTS (XII)

189338 Which element exist as a solid at $25^{o} C$ and $1$ atmospheric pressure among the following

1

B r

2

C l

3

H g

4

P

Explanation:

(d) Phosphorus exist as solid at $27^{o} C$ and $1$ atmospheric pressure (m.p. of white phosphorus = $44^{o} C$ )

07. The p-BLOCK ELEMENTS (XII)

189339 In the reaction $H N O_{3} + P_{4} O_{10} \to 4 H P O_{3} + x$ , the product $x$ is

1

N_{2} O_{3}

2

N_{2} O_{5}

3

N O_{2}

4

H_{2} O

Explanation:

(b) We know that, $4 H N O_{3} + P_{4} O_{10} \to 4 H P O_{3} + 2 N_{2} O_{5}$
The product is dinitrogen pentaoxide $(N_{2} O_{5})$ .

07. The p-BLOCK ELEMENTS (XII)

189340 The number of hydrogen atom (s) attached to phosphorus atom in hypophosphorous acid is

1 Zero

2 Two

3 One

4 Three

Explanation:

(b) Hypophosphorous acid is $H_{3} P O_{2}$ . 265-s228

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