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CHXI11:THE P-BLOCK ELEMENTS

316472 Which of the following properties describes the diagonal relationship between boron and silicon?

1

{BCl}_{3}

is not hydrolyzed while

{SiCl}_{4}

can be hydrolyzed.

2 Both form oxides:

B_{2} O_{3}

is amphoteric;

{SiO}_{2}

is acidic.

3 Both B and Si dissolve in cold and dilute nitric acid

4 Borides and silicides are hydrolyzed by water.

CHXI11:THE P-BLOCK ELEMENTS

316473 Boron does not form $B^{3 +}$ ions whereas $Al$ forms ${Al}^{3 +}$ ions. This is because :

1 The size of

B

atom is smaller than that of

Al

2 The sum of

(I E_{1} + I E_{2} + I E_{3})

of B is much higher than that of

Al

3 The sum of

(I E_{1} + I E_{2} + I E_{3})

of

A l

is much higher than that of

B

4 Both (1) and (2)

CHXI11:THE P-BLOCK ELEMENTS

316474 The first ionization enthalpy of aluminium is smaller than that of magnesium because

1 Atomic size of

Al > Mg

2 "Al" has one electron in the less penetrating p-orbital.

3

Mg

has one electron in the p-orbital

4 Atomic number of

Al > Mg

Explanation:

In case of $Al$ , the electron is to be removed from less penetrating $p$ -orbital as compared to $Mg$ where the electron is to be removed from more penetrating and completely filled s-orbital. Hence ${IE}_{1}$ of $Al$ is smaller than that of Mg.

CHXI11:THE P-BLOCK ELEMENTS

316475 Read the Statement A and Statement B carefully and mark the correct option.
Statement A :
The decrease in first ionisation enthalpy from B to Al is much larger than that from Al to Ga .
Statement B :
The d – orbitals in Ga are completely filled.

1 Statement A is incorrect but statement B is correct.

2 Both the statements A and B are correct.

3 Statement A is correct but statement B is incorrect.

4 Both the statements A and B are incorrect.

Explanation:

The decrease in first ionisation enthalpy from B to Al is associated with increase in size. The discontinuity between Al and Ga is due to low screening effect of d – electrons.
$\begin{matrix} I^{st} Ionisation enthalpy (kJ / mol) & B & Al & Ga \\ 801 & 577 & 579 \end{matrix}$
In $Ga : [Ar] 3 d^{10} 4 s^{2} 4 p^{1}, d$ – orbitals in Ga are completely filled.

JEE - 2023

CHXI11:THE P-BLOCK ELEMENTS

316472 Which of the following properties describes the diagonal relationship between boron and silicon?

1

{BCl}_{3}

is not hydrolyzed while

{SiCl}_{4}

can be hydrolyzed.

2 Both form oxides:

B_{2} O_{3}

is amphoteric;

{SiO}_{2}

is acidic.

3 Both B and Si dissolve in cold and dilute nitric acid

4 Borides and silicides are hydrolyzed by water.

CHXI11:THE P-BLOCK ELEMENTS

316473 Boron does not form $B^{3 +}$ ions whereas $Al$ forms ${Al}^{3 +}$ ions. This is because :

1 The size of

B

atom is smaller than that of

Al

2 The sum of

(I E_{1} + I E_{2} + I E_{3})

of B is much higher than that of

Al

3 The sum of

(I E_{1} + I E_{2} + I E_{3})

of

A l

is much higher than that of

B

4 Both (1) and (2)

CHXI11:THE P-BLOCK ELEMENTS

316474 The first ionization enthalpy of aluminium is smaller than that of magnesium because

1 Atomic size of

Al > Mg

2 "Al" has one electron in the less penetrating p-orbital.

3

Mg

has one electron in the p-orbital

4 Atomic number of

Al > Mg

Explanation:

In case of $Al$ , the electron is to be removed from less penetrating $p$ -orbital as compared to $Mg$ where the electron is to be removed from more penetrating and completely filled s-orbital. Hence ${IE}_{1}$ of $Al$ is smaller than that of Mg.

CHXI11:THE P-BLOCK ELEMENTS

316475 Read the Statement A and Statement B carefully and mark the correct option.
Statement A :
The decrease in first ionisation enthalpy from B to Al is much larger than that from Al to Ga .
Statement B :
The d – orbitals in Ga are completely filled.

1 Statement A is incorrect but statement B is correct.

2 Both the statements A and B are correct.

3 Statement A is correct but statement B is incorrect.

4 Both the statements A and B are incorrect.

Explanation:

The decrease in first ionisation enthalpy from B to Al is associated with increase in size. The discontinuity between Al and Ga is due to low screening effect of d – electrons.
$\begin{matrix} I^{st} Ionisation enthalpy (kJ / mol) & B & Al & Ga \\ 801 & 577 & 579 \end{matrix}$
In $Ga : [Ar] 3 d^{10} 4 s^{2} 4 p^{1}, d$ – orbitals in Ga are completely filled.

JEE - 2023

CHXI11:THE P-BLOCK ELEMENTS

316472 Which of the following properties describes the diagonal relationship between boron and silicon?

1

{BCl}_{3}

is not hydrolyzed while

{SiCl}_{4}

can be hydrolyzed.

2 Both form oxides:

B_{2} O_{3}

is amphoteric;

{SiO}_{2}

is acidic.

3 Both B and Si dissolve in cold and dilute nitric acid

4 Borides and silicides are hydrolyzed by water.

CHXI11:THE P-BLOCK ELEMENTS

316473 Boron does not form $B^{3 +}$ ions whereas $Al$ forms ${Al}^{3 +}$ ions. This is because :

1 The size of

B

atom is smaller than that of

Al

2 The sum of

(I E_{1} + I E_{2} + I E_{3})

of B is much higher than that of

Al

3 The sum of

(I E_{1} + I E_{2} + I E_{3})

of

A l

is much higher than that of

B

4 Both (1) and (2)

CHXI11:THE P-BLOCK ELEMENTS

316474 The first ionization enthalpy of aluminium is smaller than that of magnesium because

1 Atomic size of

Al > Mg

2 "Al" has one electron in the less penetrating p-orbital.

3

Mg

has one electron in the p-orbital

4 Atomic number of

Al > Mg

Explanation:

In case of $Al$ , the electron is to be removed from less penetrating $p$ -orbital as compared to $Mg$ where the electron is to be removed from more penetrating and completely filled s-orbital. Hence ${IE}_{1}$ of $Al$ is smaller than that of Mg.

CHXI11:THE P-BLOCK ELEMENTS

316475 Read the Statement A and Statement B carefully and mark the correct option.
Statement A :
The decrease in first ionisation enthalpy from B to Al is much larger than that from Al to Ga .
Statement B :
The d – orbitals in Ga are completely filled.

1 Statement A is incorrect but statement B is correct.

2 Both the statements A and B are correct.

3 Statement A is correct but statement B is incorrect.

4 Both the statements A and B are incorrect.

Explanation:

The decrease in first ionisation enthalpy from B to Al is associated with increase in size. The discontinuity between Al and Ga is due to low screening effect of d – electrons.
$\begin{matrix} I^{st} Ionisation enthalpy (kJ / mol) & B & Al & Ga \\ 801 & 577 & 579 \end{matrix}$
In $Ga : [Ar] 3 d^{10} 4 s^{2} 4 p^{1}, d$ – orbitals in Ga are completely filled.

JEE - 2023

CHXI11:THE P-BLOCK ELEMENTS

316472 Which of the following properties describes the diagonal relationship between boron and silicon?

1

{BCl}_{3}

is not hydrolyzed while

{SiCl}_{4}

can be hydrolyzed.

2 Both form oxides:

B_{2} O_{3}

is amphoteric;

{SiO}_{2}

is acidic.

3 Both B and Si dissolve in cold and dilute nitric acid

4 Borides and silicides are hydrolyzed by water.

CHXI11:THE P-BLOCK ELEMENTS

316473 Boron does not form $B^{3 +}$ ions whereas $Al$ forms ${Al}^{3 +}$ ions. This is because :

1 The size of

B

atom is smaller than that of

Al

2 The sum of

(I E_{1} + I E_{2} + I E_{3})

of B is much higher than that of

Al

3 The sum of

(I E_{1} + I E_{2} + I E_{3})

of

A l

is much higher than that of

B

4 Both (1) and (2)

CHXI11:THE P-BLOCK ELEMENTS

316474 The first ionization enthalpy of aluminium is smaller than that of magnesium because

1 Atomic size of

Al > Mg

2 "Al" has one electron in the less penetrating p-orbital.

3

Mg

has one electron in the p-orbital

4 Atomic number of

Al > Mg

Explanation:

In case of $Al$ , the electron is to be removed from less penetrating $p$ -orbital as compared to $Mg$ where the electron is to be removed from more penetrating and completely filled s-orbital. Hence ${IE}_{1}$ of $Al$ is smaller than that of Mg.

CHXI11:THE P-BLOCK ELEMENTS

316475 Read the Statement A and Statement B carefully and mark the correct option.
Statement A :
The decrease in first ionisation enthalpy from B to Al is much larger than that from Al to Ga .
Statement B :
The d – orbitals in Ga are completely filled.

1 Statement A is incorrect but statement B is correct.

2 Both the statements A and B are correct.

3 Statement A is correct but statement B is incorrect.

4 Both the statements A and B are incorrect.

Explanation:

The decrease in first ionisation enthalpy from B to Al is associated with increase in size. The discontinuity between Al and Ga is due to low screening effect of d – electrons.
$\begin{matrix} I^{st} Ionisation enthalpy (kJ / mol) & B & Al & Ga \\ 801 & 577 & 579 \end{matrix}$
In $Ga : [Ar] 3 d^{10} 4 s^{2} 4 p^{1}, d$ – orbitals in Ga are completely filled.

JEE - 2023

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