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11. THE P-BLOCK ELEMENTS

189634 The liquid field metal expanding on solidification is

1

G a

2

A l

3

Z n

4

C u

Explanation:

(a) Liquified Ga expand on solidification $G a$ is less electropositive in nature, It has the weak metallic bond so it expand on solidification.

11. THE P-BLOCK ELEMENTS

189637 Which of the following is known as inorganic benzene

1 Borazine

2 Boron nitride

3

p

- dichlorobenzene

4 Phosphonitrilic acid

Explanation:

(a) Borazine $B_{3} N_{3} H_{6}$ , is isoelectronic to benzene and hence, is called inorganic benzene some physical properties of benzene and borazine are also similar. 263-s20

11. THE P-BLOCK ELEMENTS

189638 Which of the following is only acidic in nature

1

B e (O H)_{2}

2

M g (O H)_{2}

3

B (O H)_{3}

4

A l (O H)_{3}

Explanation:

(c) Except $B (O H)_{3}$ all other hydroxide are of metallic hydroxide having the basic nature $B (O H)_{3}$ are the hydroxide of nonmetal showing the acidic nature.

11. THE P-BLOCK ELEMENTS

189660 Aluminium $(I I I)$ chloride forms a dimer because

1 Higher coordination number can be achieved by aluminium

2 Aluminium has high ionization energy

3 Aluminium belongs to

I I I

group

4 It cannot form a trimer

Explanation:

$A l C l_{3}$ can form dimer and exists as $A l_{2} C l_{6}$ , aluminium has vacant $d$ -orbitals which can accommodate electron from chlorine atom. $A l C l_{3}$ is an electron deficient compound in $A l$ (octet incomplete) thus behaves as Lewis acid and $A l$ completes it by taking electron pair from $C l$ -atom as shown in figure.

11. THE P-BLOCK ELEMENTS

189634 The liquid field metal expanding on solidification is

1

G a

2

A l

3

Z n

4

C u

Explanation:

(a) Liquified Ga expand on solidification $G a$ is less electropositive in nature, It has the weak metallic bond so it expand on solidification.

11. THE P-BLOCK ELEMENTS

189637 Which of the following is known as inorganic benzene

1 Borazine

2 Boron nitride

3

p

- dichlorobenzene

4 Phosphonitrilic acid

Explanation:

(a) Borazine $B_{3} N_{3} H_{6}$ , is isoelectronic to benzene and hence, is called inorganic benzene some physical properties of benzene and borazine are also similar. 263-s20

11. THE P-BLOCK ELEMENTS

189638 Which of the following is only acidic in nature

1

B e (O H)_{2}

2

M g (O H)_{2}

3

B (O H)_{3}

4

A l (O H)_{3}

Explanation:

(c) Except $B (O H)_{3}$ all other hydroxide are of metallic hydroxide having the basic nature $B (O H)_{3}$ are the hydroxide of nonmetal showing the acidic nature.

11. THE P-BLOCK ELEMENTS

189660 Aluminium $(I I I)$ chloride forms a dimer because

1 Higher coordination number can be achieved by aluminium

2 Aluminium has high ionization energy

3 Aluminium belongs to

I I I

group

4 It cannot form a trimer

Explanation:

$A l C l_{3}$ can form dimer and exists as $A l_{2} C l_{6}$ , aluminium has vacant $d$ -orbitals which can accommodate electron from chlorine atom. $A l C l_{3}$ is an electron deficient compound in $A l$ (octet incomplete) thus behaves as Lewis acid and $A l$ completes it by taking electron pair from $C l$ -atom as shown in figure.

11. THE P-BLOCK ELEMENTS

189634 The liquid field metal expanding on solidification is

1

G a

2

A l

3

Z n

4

C u

Explanation:

(a) Liquified Ga expand on solidification $G a$ is less electropositive in nature, It has the weak metallic bond so it expand on solidification.

11. THE P-BLOCK ELEMENTS

189637 Which of the following is known as inorganic benzene

1 Borazine

2 Boron nitride

3

p

- dichlorobenzene

4 Phosphonitrilic acid

Explanation:

(a) Borazine $B_{3} N_{3} H_{6}$ , is isoelectronic to benzene and hence, is called inorganic benzene some physical properties of benzene and borazine are also similar. 263-s20

11. THE P-BLOCK ELEMENTS

189638 Which of the following is only acidic in nature

1

B e (O H)_{2}

2

M g (O H)_{2}

3

B (O H)_{3}

4

A l (O H)_{3}

Explanation:

(c) Except $B (O H)_{3}$ all other hydroxide are of metallic hydroxide having the basic nature $B (O H)_{3}$ are the hydroxide of nonmetal showing the acidic nature.

11. THE P-BLOCK ELEMENTS

189660 Aluminium $(I I I)$ chloride forms a dimer because

1 Higher coordination number can be achieved by aluminium

2 Aluminium has high ionization energy

3 Aluminium belongs to

I I I

group

4 It cannot form a trimer

Explanation:

$A l C l_{3}$ can form dimer and exists as $A l_{2} C l_{6}$ , aluminium has vacant $d$ -orbitals which can accommodate electron from chlorine atom. $A l C l_{3}$ is an electron deficient compound in $A l$ (octet incomplete) thus behaves as Lewis acid and $A l$ completes it by taking electron pair from $C l$ -atom as shown in figure.

11. THE P-BLOCK ELEMENTS

189634 The liquid field metal expanding on solidification is

1

G a

2

A l

3

Z n

4

C u

Explanation:

(a) Liquified Ga expand on solidification $G a$ is less electropositive in nature, It has the weak metallic bond so it expand on solidification.

11. THE P-BLOCK ELEMENTS

189637 Which of the following is known as inorganic benzene

1 Borazine

2 Boron nitride

3

p

- dichlorobenzene

4 Phosphonitrilic acid

Explanation:

(a) Borazine $B_{3} N_{3} H_{6}$ , is isoelectronic to benzene and hence, is called inorganic benzene some physical properties of benzene and borazine are also similar. 263-s20

11. THE P-BLOCK ELEMENTS

189638 Which of the following is only acidic in nature

1

B e (O H)_{2}

2

M g (O H)_{2}

3

B (O H)_{3}

4

A l (O H)_{3}

Explanation:

(c) Except $B (O H)_{3}$ all other hydroxide are of metallic hydroxide having the basic nature $B (O H)_{3}$ are the hydroxide of nonmetal showing the acidic nature.

11. THE P-BLOCK ELEMENTS

189660 Aluminium $(I I I)$ chloride forms a dimer because

1 Higher coordination number can be achieved by aluminium

2 Aluminium has high ionization energy

3 Aluminium belongs to

I I I

group

4 It cannot form a trimer

Explanation:

$A l C l_{3}$ can form dimer and exists as $A l_{2} C l_{6}$ , aluminium has vacant $d$ -orbitals which can accommodate electron from chlorine atom. $A l C l_{3}$ is an electron deficient compound in $A l$ (octet incomplete) thus behaves as Lewis acid and $A l$ completes it by taking electron pair from $C l$ -atom as shown in figure.