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07. The p-BLOCK ELEMENTS (XII)

189220 Amongst $H_{2} O,$ $H_{2} S,$ $H_{2} S e$ and $H_{2} T e$ the one with the highest boiling point is

1

H_{2} O

because of hydrogen bonding

2

H_{2} T e

because of higher molecular weight

3

H_{2} S

because of hydrogen bonding

4

H_{2} S e

because of lower molecular weight

Explanation:

(a) $H_{2} O$ containing hydrogen bond.

07. The p-BLOCK ELEMENTS (XII)

189221 Among the hydrides formed by the group $V I - A$ elements, only $H_{2} O$ has an abnormally low volatility (high boiling point). This is so because

1

H_{2} O

molecules are associated due to intermolecular hydrogen bonds

2

H_{2} O

is covalent in nature

3 The

O - H

bond in

H_{2} O

is very strong

4 The electronegativity difference of

H

and

O

is very large

07. The p-BLOCK ELEMENTS (XII)

189222 Sulphuric acid reacts with $P C l_{5}$ to give

1 Thionyl chloride

2 Sulphur monochloride

3 Sulphuryl chloride

4 Sulphur tetrachloride

Explanation:

(c) $H O - S O_{2} - O H + P C l_{5} \to C l - S O_{2} - O H + P O C l_{3} + H C l$
$H O - S O_{2} - O H + 2 P C l_{5} \to \underset{S u l p h u r y l c h l o r i d e}{C l - S O_{2} - C l} + 2 P O C l_{3} + 2 H C l$

07. The p-BLOCK ELEMENTS (XII)

189223 Carbogen is

1 Pure form of carbon

2

C O C l_{2}

3 Mixture of

C O

and

C O_{2}

4 Mixture of

O_{2}

and

C O_{2}

Explanation:

(d) Mixture of $O_{2}$ and $C O_{2}$ .

07. The p-BLOCK ELEMENTS (XII)

189220 Amongst $H_{2} O,$ $H_{2} S,$ $H_{2} S e$ and $H_{2} T e$ the one with the highest boiling point is

1

H_{2} O

because of hydrogen bonding

2

H_{2} T e

because of higher molecular weight

3

H_{2} S

because of hydrogen bonding

4

H_{2} S e

because of lower molecular weight

Explanation:

(a) $H_{2} O$ containing hydrogen bond.

07. The p-BLOCK ELEMENTS (XII)

189221 Among the hydrides formed by the group $V I - A$ elements, only $H_{2} O$ has an abnormally low volatility (high boiling point). This is so because

1

H_{2} O

molecules are associated due to intermolecular hydrogen bonds

2

H_{2} O

is covalent in nature

3 The

O - H

bond in

H_{2} O

is very strong

4 The electronegativity difference of

H

and

O

is very large

07. The p-BLOCK ELEMENTS (XII)

189222 Sulphuric acid reacts with $P C l_{5}$ to give

1 Thionyl chloride

2 Sulphur monochloride

3 Sulphuryl chloride

4 Sulphur tetrachloride

Explanation:

(c) $H O - S O_{2} - O H + P C l_{5} \to C l - S O_{2} - O H + P O C l_{3} + H C l$
$H O - S O_{2} - O H + 2 P C l_{5} \to \underset{S u l p h u r y l c h l o r i d e}{C l - S O_{2} - C l} + 2 P O C l_{3} + 2 H C l$

07. The p-BLOCK ELEMENTS (XII)

189223 Carbogen is

1 Pure form of carbon

2

C O C l_{2}

3 Mixture of

C O

and

C O_{2}

4 Mixture of

O_{2}

and

C O_{2}

Explanation:

(d) Mixture of $O_{2}$ and $C O_{2}$ .

07. The p-BLOCK ELEMENTS (XII)

189220 Amongst $H_{2} O,$ $H_{2} S,$ $H_{2} S e$ and $H_{2} T e$ the one with the highest boiling point is

1

H_{2} O

because of hydrogen bonding

2

H_{2} T e

because of higher molecular weight

3

H_{2} S

because of hydrogen bonding

4

H_{2} S e

because of lower molecular weight

Explanation:

(a) $H_{2} O$ containing hydrogen bond.

07. The p-BLOCK ELEMENTS (XII)

189221 Among the hydrides formed by the group $V I - A$ elements, only $H_{2} O$ has an abnormally low volatility (high boiling point). This is so because

1

H_{2} O

molecules are associated due to intermolecular hydrogen bonds

2

H_{2} O

is covalent in nature

3 The

O - H

bond in

H_{2} O

is very strong

4 The electronegativity difference of

H

and

O

is very large

07. The p-BLOCK ELEMENTS (XII)

189222 Sulphuric acid reacts with $P C l_{5}$ to give

1 Thionyl chloride

2 Sulphur monochloride

3 Sulphuryl chloride

4 Sulphur tetrachloride

Explanation:

(c) $H O - S O_{2} - O H + P C l_{5} \to C l - S O_{2} - O H + P O C l_{3} + H C l$
$H O - S O_{2} - O H + 2 P C l_{5} \to \underset{S u l p h u r y l c h l o r i d e}{C l - S O_{2} - C l} + 2 P O C l_{3} + 2 H C l$

07. The p-BLOCK ELEMENTS (XII)

189223 Carbogen is

1 Pure form of carbon

2

C O C l_{2}

3 Mixture of

C O

and

C O_{2}

4 Mixture of

O_{2}

and

C O_{2}

Explanation:

(d) Mixture of $O_{2}$ and $C O_{2}$ .

07. The p-BLOCK ELEMENTS (XII)

189220 Amongst $H_{2} O,$ $H_{2} S,$ $H_{2} S e$ and $H_{2} T e$ the one with the highest boiling point is

1

H_{2} O

because of hydrogen bonding

2

H_{2} T e

because of higher molecular weight

3

H_{2} S

because of hydrogen bonding

4

H_{2} S e

because of lower molecular weight

Explanation:

(a) $H_{2} O$ containing hydrogen bond.

07. The p-BLOCK ELEMENTS (XII)

189221 Among the hydrides formed by the group $V I - A$ elements, only $H_{2} O$ has an abnormally low volatility (high boiling point). This is so because

1

H_{2} O

molecules are associated due to intermolecular hydrogen bonds

2

H_{2} O

is covalent in nature

3 The

O - H

bond in

H_{2} O

is very strong

4 The electronegativity difference of

H

and

O

is very large

07. The p-BLOCK ELEMENTS (XII)

189222 Sulphuric acid reacts with $P C l_{5}$ to give

1 Thionyl chloride

2 Sulphur monochloride

3 Sulphuryl chloride

4 Sulphur tetrachloride

Explanation:

(c) $H O - S O_{2} - O H + P C l_{5} \to C l - S O_{2} - O H + P O C l_{3} + H C l$
$H O - S O_{2} - O H + 2 P C l_{5} \to \underset{S u l p h u r y l c h l o r i d e}{C l - S O_{2} - C l} + 2 P O C l_{3} + 2 H C l$

07. The p-BLOCK ELEMENTS (XII)

189223 Carbogen is

1 Pure form of carbon

2

C O C l_{2}

3 Mixture of

C O

and

C O_{2}

4 Mixture of

O_{2}

and

C O_{2}

Explanation:

(d) Mixture of $O_{2}$ and $C O_{2}$ .

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