QBManager

11. THE P-BLOCK ELEMENTS

189646 Anhydrous $A l C l_{3}$ cannot be obtained from which of the following reactions

1 Heating

A l C l_{3} .6 H_{2} O

2 By passing dry

H C l

over hot aluminium powder

3 By passing dry

C l_{2}

over hot aluminium powder

4 By passing dry

C l_{2}

over a hot mixture of alumina and coke

Explanation:

(a) $A l C l_{3} .6 H_{2} O \overset{Δ}{\to} A l (O H)_{3} + 3 H C l + 3 H_{2} O$
Thus $A l C l_{3}$ can not be obtained by this method

11. THE P-BLOCK ELEMENTS

190055 Match List $- I$ with List $- I I :$ List $- I$
List $- I I$

$(a)$ $NaOH$
$(i)$ Acidic

$(b)$ $Be (OH)_{2}$
$(i i)$ Basic

$(c)$ $Ca (OH)_{2}$

$(i i i)$ Amphoteric

$(d)$ $B (OH)_{3}$

$(e)$ $Al (OH)_{3}$ Choose the most appropriate answer from the option given below :

1

(a) - (i i), (b) - (i i), (c) - (i i i), (d) - (i i), (e) - (i i i)

2

(a) - (i i), (b) - (i i i), (c) - (i i), (d) - (i), (e) - (i i i)

3

(a) - (i i), (b) - (i i), (c) - (i i i), (d) - (i), (e) - (i i i)

4

(a) - (i i), (b) - (i), (c) - (i i), (d) - (i i i), (e) - (i i i)

Explanation:

$NaOH ⟶$ Basic
$Be (OH)_{2} ⟶$ Amphoteric
$Ca (OH)_{2} ⟶$ Basic
$B (OH)_{3} ⟶$ Acidic
$Al (OH)_{3} ⟶$ Amphoteric

11. THE P-BLOCK ELEMENTS

190056 The tendency to form monovalent compounds among the Group $13$ elements is correctly exhibited in :

1

B < A l < G a < I n < T l

2

T l < I n < G a < A l < B

3

T l \approx I n < G a < A l < B

4

B \approx A l \approx G a \approx I n \approx T l

Explanation:

$B < A l < G a < I n < T l$

11. THE P-BLOCK ELEMENTS

190058 Which of the following statement is not correct about diborane?

1 The four terminal

B - H

bonds are two centre two electron bonds.

2 The four terminal Hydrogen atoms and the two Boron atoms lie in one plane.

3 Both the Boron atoms are

s p^{2}

hybridised.

4 There are two

3 -

centre

- 2 -

electron bonds.

Explanation:

$B$ has $s p^{3}$ Hybridisation
Non- planar

11. THE P-BLOCK ELEMENTS

189646 Anhydrous $A l C l_{3}$ cannot be obtained from which of the following reactions

1 Heating

A l C l_{3} .6 H_{2} O

2 By passing dry

H C l

over hot aluminium powder

3 By passing dry

C l_{2}

over hot aluminium powder

4 By passing dry

C l_{2}

over a hot mixture of alumina and coke

Explanation:

(a) $A l C l_{3} .6 H_{2} O \overset{Δ}{\to} A l (O H)_{3} + 3 H C l + 3 H_{2} O$
Thus $A l C l_{3}$ can not be obtained by this method

11. THE P-BLOCK ELEMENTS

190055 Match List $- I$ with List $- I I :$ List $- I$
List $- I I$

$(a)$ $NaOH$
$(i)$ Acidic

$(b)$ $Be (OH)_{2}$
$(i i)$ Basic

$(c)$ $Ca (OH)_{2}$

$(i i i)$ Amphoteric

$(d)$ $B (OH)_{3}$

$(e)$ $Al (OH)_{3}$ Choose the most appropriate answer from the option given below :

1

(a) - (i i), (b) - (i i), (c) - (i i i), (d) - (i i), (e) - (i i i)

2

(a) - (i i), (b) - (i i i), (c) - (i i), (d) - (i), (e) - (i i i)

3

(a) - (i i), (b) - (i i), (c) - (i i i), (d) - (i), (e) - (i i i)

4

(a) - (i i), (b) - (i), (c) - (i i), (d) - (i i i), (e) - (i i i)

Explanation:

$NaOH ⟶$ Basic
$Be (OH)_{2} ⟶$ Amphoteric
$Ca (OH)_{2} ⟶$ Basic
$B (OH)_{3} ⟶$ Acidic
$Al (OH)_{3} ⟶$ Amphoteric

11. THE P-BLOCK ELEMENTS

190056 The tendency to form monovalent compounds among the Group $13$ elements is correctly exhibited in :

1

B < A l < G a < I n < T l

2

T l < I n < G a < A l < B

3

T l \approx I n < G a < A l < B

4

B \approx A l \approx G a \approx I n \approx T l

Explanation:

$B < A l < G a < I n < T l$

11. THE P-BLOCK ELEMENTS

190058 Which of the following statement is not correct about diborane?

1 The four terminal

B - H

bonds are two centre two electron bonds.

2 The four terminal Hydrogen atoms and the two Boron atoms lie in one plane.

3 Both the Boron atoms are

s p^{2}

hybridised.

4 There are two

3 -

centre

- 2 -

electron bonds.

Explanation:

$B$ has $s p^{3}$ Hybridisation
Non- planar

11. THE P-BLOCK ELEMENTS

189646 Anhydrous $A l C l_{3}$ cannot be obtained from which of the following reactions

1 Heating

A l C l_{3} .6 H_{2} O

2 By passing dry

H C l

over hot aluminium powder

3 By passing dry

C l_{2}

over hot aluminium powder

4 By passing dry

C l_{2}

over a hot mixture of alumina and coke

Explanation:

(a) $A l C l_{3} .6 H_{2} O \overset{Δ}{\to} A l (O H)_{3} + 3 H C l + 3 H_{2} O$
Thus $A l C l_{3}$ can not be obtained by this method

11. THE P-BLOCK ELEMENTS

190055 Match List $- I$ with List $- I I :$ List $- I$
List $- I I$

$(a)$ $NaOH$
$(i)$ Acidic

$(b)$ $Be (OH)_{2}$
$(i i)$ Basic

$(c)$ $Ca (OH)_{2}$

$(i i i)$ Amphoteric

$(d)$ $B (OH)_{3}$

$(e)$ $Al (OH)_{3}$ Choose the most appropriate answer from the option given below :

1

(a) - (i i), (b) - (i i), (c) - (i i i), (d) - (i i), (e) - (i i i)

2

(a) - (i i), (b) - (i i i), (c) - (i i), (d) - (i), (e) - (i i i)

3

(a) - (i i), (b) - (i i), (c) - (i i i), (d) - (i), (e) - (i i i)

4

(a) - (i i), (b) - (i), (c) - (i i), (d) - (i i i), (e) - (i i i)

Explanation:

$NaOH ⟶$ Basic
$Be (OH)_{2} ⟶$ Amphoteric
$Ca (OH)_{2} ⟶$ Basic
$B (OH)_{3} ⟶$ Acidic
$Al (OH)_{3} ⟶$ Amphoteric

11. THE P-BLOCK ELEMENTS

190056 The tendency to form monovalent compounds among the Group $13$ elements is correctly exhibited in :

1

B < A l < G a < I n < T l

2

T l < I n < G a < A l < B

3

T l \approx I n < G a < A l < B

4

B \approx A l \approx G a \approx I n \approx T l

Explanation:

$B < A l < G a < I n < T l$

11. THE P-BLOCK ELEMENTS

190058 Which of the following statement is not correct about diborane?

1 The four terminal

B - H

bonds are two centre two electron bonds.

2 The four terminal Hydrogen atoms and the two Boron atoms lie in one plane.

3 Both the Boron atoms are

s p^{2}

hybridised.

4 There are two

3 -

centre

- 2 -

electron bonds.

Explanation:

$B$ has $s p^{3}$ Hybridisation
Non- planar

11. THE P-BLOCK ELEMENTS

189646 Anhydrous $A l C l_{3}$ cannot be obtained from which of the following reactions

1 Heating

A l C l_{3} .6 H_{2} O

2 By passing dry

H C l

over hot aluminium powder

3 By passing dry

C l_{2}

over hot aluminium powder

4 By passing dry

C l_{2}

over a hot mixture of alumina and coke

Explanation:

(a) $A l C l_{3} .6 H_{2} O \overset{Δ}{\to} A l (O H)_{3} + 3 H C l + 3 H_{2} O$
Thus $A l C l_{3}$ can not be obtained by this method

11. THE P-BLOCK ELEMENTS

190055 Match List $- I$ with List $- I I :$ List $- I$
List $- I I$

$(a)$ $NaOH$
$(i)$ Acidic

$(b)$ $Be (OH)_{2}$
$(i i)$ Basic

$(c)$ $Ca (OH)_{2}$

$(i i i)$ Amphoteric

$(d)$ $B (OH)_{3}$

$(e)$ $Al (OH)_{3}$ Choose the most appropriate answer from the option given below :

1

(a) - (i i), (b) - (i i), (c) - (i i i), (d) - (i i), (e) - (i i i)

2

(a) - (i i), (b) - (i i i), (c) - (i i), (d) - (i), (e) - (i i i)

3

(a) - (i i), (b) - (i i), (c) - (i i i), (d) - (i), (e) - (i i i)

4

(a) - (i i), (b) - (i), (c) - (i i), (d) - (i i i), (e) - (i i i)

Explanation:

$NaOH ⟶$ Basic
$Be (OH)_{2} ⟶$ Amphoteric
$Ca (OH)_{2} ⟶$ Basic
$B (OH)_{3} ⟶$ Acidic
$Al (OH)_{3} ⟶$ Amphoteric

11. THE P-BLOCK ELEMENTS

190056 The tendency to form monovalent compounds among the Group $13$ elements is correctly exhibited in :

1

B < A l < G a < I n < T l

2

T l < I n < G a < A l < B

3

T l \approx I n < G a < A l < B

4

B \approx A l \approx G a \approx I n \approx T l

Explanation:

$B < A l < G a < I n < T l$

11. THE P-BLOCK ELEMENTS

190058 Which of the following statement is not correct about diborane?

1 The four terminal

B - H

bonds are two centre two electron bonds.

2 The four terminal Hydrogen atoms and the two Boron atoms lie in one plane.

3 Both the Boron atoms are

s p^{2}

hybridised.

4 There are two

3 -

centre

- 2 -

electron bonds.

Explanation:

$B$ has $s p^{3}$ Hybridisation
Non- planar

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