P Block Group 15 (Nitrogen Family) Notes, Properties & Reactions

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Q 1 :

Regarding the hydrides of group 15 elements $E H_{3} (E = N, P, A s, S b)$ , select the correct statement from the following:

A. The stability of hydrides decreases down the group.
B. The basicity of hydrides decreases down the group.
C. The reducing character increases down the group.
D. The boiling point increases down the group.

Choose the correct answer from the options given below: [2026]

A & D only
A, B, C & D
A, B & C only
B & C only

(3)

${Stability: NH}_{3} > {PH}_{3} > {AsH}_{3} > {SbH}_{3} > {BiH}_{3}$

${Basicity: NH}_{3} > {PH}_{3} > {AsH}_{3} > {SbH}_{3} > {BiH}_{3}$

${Reducing character: NH}_{3} < {PH}_{3} < {AsH}_{3} < {SbH}_{3} < {BiH}_{3}$

${Boiling point: PH}_{3} < {AsH}_{3} < {NH}_{3} < {SbH}_{3} < {BiH}_{3}$

Q 2 :

Statement – I: All elements of group 15 form hydrides of type ${EH}_{3}$ where E = N, P, As, Sb or Bi

Statement – II: All elements of group 15 form halides of type ${EX}_{3}$ where E = N, P, As, Sb or Bi

Statement – III: In case of halides of nitrogen only ${NF}_{3}$ is known to be stable

Statement – IV: The oxides of type $E_{2} O_{3}$ of arsenic and antimony are amphoteric and those of bismuth are predominantly basic

Select the correct combination

I, II, III only
I, II, III, IV
I, III, IV only
I, IV only

(2)

Q 3 :

Which of the following is a neutral oxide?

$N a_{2} O$
$N_{2} O$
$N a O_{2}$
$N O_{2}$

(2)

$N_{2} O$ , NO and CO are neutral oxides.

[IMAGE 51]

Q 4 :

Consider the following orders against the mentioned property:

I. $Mg < Si < Al < S < P$ (2nd ionisation potential)

II. ${Na}_{2} O < MgO < {Al}_{2} O_{3} < P_{2} O_{5}$ (Acidic strength)

III. $C < N < O < F$ (Electron affinity)

The incorrect order(s) is/are

Only I
Only III
Only I and III
I, II and III

(3)

Hint: On moving left to right, acidic strength of oxide increases.

Correct order of 2nd I.P. : $M g < S i < A l < P < S$

Correct order of electron affinity: $N < C < O < F$

Topic Question Set

(2)

Q 3 :

Which of the following is a neutral oxide?

Q 4 :

Consider the following orders against the mentioned property:

I. $Mg < Si < Al < S < P$ (2nd ionisation potential)

II. ${Na}_{2} O < MgO < {Al}_{2} O_{3} < P_{2} O_{5}$ (Acidic strength)

III. $C < N < O < F$ (Electron affinity)

The incorrect order(s) is/are

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Topic Question Set

(2)

Q 3 : Which of the following is a neutral oxide?

Q 4 : Consider the following orders against the mentioned property: I. Mg<Si<Al<S<P (2nd ionisation potential) II. Na2O<MgO<Al2O3<P2O5 (Acidic strength) III. C<N<O<F (Electron affinity) The incorrect order(s) is/are

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Q 3 :

Which of the following is a neutral oxide?

Q 4 :

Consider the following orders against the mentioned property:

I. $Mg < Si < Al < S < P$ (2nd ionisation potential)

II. ${Na}_{2} O < MgO < {Al}_{2} O_{3} < P_{2} O_{5}$ (Acidic strength)

III. $C < N < O < F$ (Electron affinity)

The incorrect order(s) is/are