The p-Block Elements (Class XII) The p-Block Elements (XII) Chemistry NEET Practice Questions, MCQs, Past Year Questions (PYQs), NCERT Questions, Question Bank, Class 11 and Class 12 Questions, and PDF solved with answers

Q1:

Which of the following elements does not show allotropy?

1. Nitrogen

2. Bismuth

3. Antimony

4. Arsenic

Subtopic: Group 15 - Preparation, Properties & Uses |

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Q2:

The maximum covalency of nitrogen is:

1.	3	2.	5
3.	4	4.	6

Subtopic: Group 15 - Preparation, Properties & Uses |

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Q3:

Consider the following statements .

I:	A single N-N bond is weaker than a single P-P bond.
II:	Nitrogen cannot form a $d \pi - p \pi $ bond.
III:	Except for nitrogen, all the elements of the 15^thgroup show allotropy.

The correct statement among the following is/are:

1.	I only	2.	II only
3.	I and II only	4.	I, II, and III

Subtopic: Group 15 - Preparation, Properties & Uses |

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Q4:

Arrange the following molecules in decreasing order of their basic strength : PH₃, AsH₃, SbH₃, and BiH₃:

1.	PH₃ > SbH₃ > BiH₃ >AsH₃
2.	PH₃ > AsH₃ > SbH₃ > BiH₃
3.	BiH₃ > SbH₃ > AsH₃ > PH₃
4.	BiH₃ > AsH₃ > SbH₃ > PH₃

Subtopic: Group 15 - Preparation, Properties & Uses |

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Q5:

Which of the following elements can be involved in pπ-dπ bonding?

1. Carbon

2. Nitrogen

3. Phosphorus

4. Boron

Subtopic: Group 15 - Preparation, Properties & Uses |

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Q6:

The bond dissociation enthalpy of E—H (E = element) bonds is given below. Which of the compounds will act as the strongest reducing agent?

Compound	$N H_{3}$	$P H_{3}$	$A s H_{3}$	$S b H_{3}$
$∆_{d i s s} (E - H) / k j m o l^{- 1}$	389	322	297	255

$1. N H_{3}$

$2. P H_{3}$

$3. A s H_{3}$

$4. S b H_{3}$

Subtopic: Group 15 - Preparation, Properties & Uses |

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Q7:

Which of the following statements is wrong?

1.	Single N—N bond is stronger than a single P—P bond.
2.	${PH}_{3}$ can act as a ligand in the formation of coordination compound with transition elements.
3.	${NO}_{2}$ is paramagnetic in nature.
4.	Covalency of nitrogen in $N_{2} O_{5}$ is four.

Subtopic: Group 16 - Preparation, Properties & Uses | Group 15 - Preparation, Properties & Uses |

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Q8:

Elements of group-15 form compounds in +5 oxidation state. However, bismuth forms only one well-characterized compound in +5 oxidation state. The compound is-

$1 . {Bi}_{2} O_{5}$
$2 . {BiF}_{5}$
$3 . {BiCl}_{5}$
$4 . {Bi}_{2} S_{5}$

Subtopic: Group 15 - Preparation, Properties & Uses |

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Q9:

On heating ammonium dichromate and barium azide separately we get:

1.	$N_{2}$ in both cases
2.	$N_{2}$ with ammonium dichromate and $NO$ with barium azide
3.	$N_{2} O$ with ammonium dichromate and $N_{2}$ with barium azide
4.	$N_{2} O$ with ammonium dichromate and ${NO}_{2}$ with barium azide

Subtopic: Group 15 - Preparation, Properties & Uses |

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Q10:

Assertion (A):	Phosphorus is more reactive than nitrogen.
Reason (R):	P₄ is singly bonded whereas N₂ is triple bonded.

1.	Both (A) and (R) are True and (R) is the correct explanation of (A).
2.	Both (A) and (R) are True but (R) is not the correct explanation of (A).
3.	(A) is True but (R) is False.
4.	Both (A) and (R) are False.

Subtopic: Group 15 - Preparation, Properties & Uses |

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I:	A single N-N bond is weaker than a single P-P bond.
II:	Nitrogen cannot form a \(d \pi - p \pi \) bond.
III:	Except for nitrogen, all the elements of the 15^thgroup show allotropy.

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