CBSE Class 12 Chemistry The p Block Elements Notes and Questions

Class 12 Chemistry Practice Assignments: CBSE Class 12 Chemistry The p Block Elements Notes and Questions

Explore structured practice materials through the CBSE Class 12 Chemistry The p Block Elements Notes and Questions. Tailored for Class 12 learners, utilizing these Chemistry assignments ensures thorough preparation and strengthens foundational knowledge before final CBSE evaluations.

Download Unit 07 The P-Block Elements Assignment PDF with Solutions

View or download the dedicated CBSE Class 12 Chemistry The p Block Elements Notes and Questions resource below. Engaging with these assignments under focused study conditions ensures continuous academic progress and mastery of the 2026-27 curriculum.

Points to remember:‐
 
The general valence shell electronic configuration of p‐block elements ns2 np1‐6
 
GROUP 15 ELEMENTS:‐
 
Group 15 elements ; N, P, As, Sb & Bi
General electronic configuration: ns2np3
Physical Properties:‐
 
• Dinitrogen is a diatomic gas while all others are solids.
 
• N & P are non‐metals. As & Sb metalloids & Bi is a metals . this is due to decrease in ionization enthalpy & increase in atomic size .
 
• Electro negativity decreases down the group .
 
Chemical properties:‐
 
• Common oxidation states : ‐3, +3 & +5.
 
• Due to inert effect, the stability of +5 state decreases down the group & stability of +3 state increases .
 
• In the case of Nitrogen all Oxidation states from +1 to +4 tend to disproportionate in acid solution , e.g.:‐ 3HNO3→H2O +2NO
Anamalous behavior of Nitrogen :‐ due to its small size, high electronegativity, high ionization enthalpy and absence of d‐orbital.
 
N2 has unique ability to pπ‐pπ multiple bonds whereas the heavier of this group do not form pπ–pπ because there atomic orbitals are so large & diffuse that they cannot have effective overlapping.
Nitrogen exists as diatomic molecule with triple bond between the two atoms whereas other elements form single bonds in elemental state. N cannot form dπ‐pπ due to the non availibility of d‐orbitals whereas other elements can.
 
 PROPERTIES:‐

(i)conc. HNO3 is a strong oxidizing agent & attacks most metals gold & Pt.
.
(ii)Cr & Al do not dissolve HNO3 because of the formation of a positive film of oxide on the surface.

(iii)it oxidises non metals like I2 to HNO3, C to CO2 , S to H2so4

(iv)brown ring tes is used to detect NO‐.

PHOSPHOROUS:‐

ALLOTROPIC FORMS: White , red α‐black &β‐black . White phosphorous is more reactive red phosphorous because white P exists as discrete P4 molecules . in red P several P4molecules are linked to formed polymeric chain.
 
Important Questions for NCERT Class 12 Chemistry The p Block Elements
 

Question. Which of the following has the highest dipole moment?
(a) SbH3
(b) AsH3
(c) NH3
(d) PH3 

Answer    C
 

Question. The basic character of hydrides of the V group elements decreases in the order
(a) NH3 > PH3 > AsH3 > SbH3
(b) SbH3 > AsH3 > PH3 > NH3
(c) SbH3 > PH3 > AsH3 > NH3
(d) NH3 > SbH3 > PH3 > AsH3 

Answer    A


Question. Among the following oxides, the lowest acidic is
(a) As4O6
(b) As4O10
(c) P4O6
(d) P4O10 

Answer    A


Question. Which of the following fluorides does not exist?
(a) NF5
(b) PF5
(c) AsF5
(d) SbF5 

Answer    A


Question. Which one has the lowest boiling point?
(a) NH3
(b) PH3
(c) AsH3
(d) SbH3

Answer   B


Question. Number of electrons shared in the formation of nitrogen molecule is
(a) 6
(b) 10
(c) 2
(d) 8

Answer    A


Question. Nitrogen is relatively inactive element because
(a) its atom has a stable electronic configuration
(b) it has low atomic radius
(c) its electronegativity is fairly high
(d) dissociation energy of its molecule is fairly high.

Answer   D


Question. Pure nitrogen is prepared in the laboratory by heating a mixture of
(a) NH4OH + NaCl
(b) NH4NO3 + NaCl
(c) NH4Cl + NaOH
(d) NH4Cl + NaNO2. 

Answer   D


Question. Which of the following statement is not correct for nitrogen?
(a) Its electronegativity is very high.
(b) d-orbitals are available for bonding.
(c) It is a typical non-metal.
(d) Its molecular size is small.

Answer    B


Question. Urea reacts with water to form A which will decompose to form B. B when passed through Cu2+ (aq), deep blue colour solution C is formed. What is the formula of C from the following?
(a) CuSO4
(b) [Cu(NH3)4]2+
(c) Cu(OH)2
(d) CuCO3·Cu(OH)2

Answer   B


Question. Aqueous solution of ammonia consists of
(a) H+
(b) OH–
(c) NH4+
(d) NH4+ and OH–.

Answer   D


Question. Which of the following oxides of nitrogen is paramagnetic?
(a) NO2
(b) N2O3
(c) N2O
(d) N2O5 

Answer   A


Question. Which of the following is a nitric acid anhydride?
(a) NO
(b) NO2
(c) N2O5
(d) N2O3

Answer    C


Question. When copper is heated with conc. HNO3 it produces
(a) Cu(NO3)2, NO and NO2
(b) Cu(NO3)2 and N2O
(c) Cu(NO3)2 and NO2
(d) Cu(NO3)2 and NO 

Answer    C


Question. Zn gives H2 gas with H2SO4 and HCl but not with HNO3 because
(a) Zn act as oxidising agent when react with HNO3
(b) HNO3 is weaker acid than H2SO4 and HCl
(c) in electrochemical series Zn is above hydrogen
(d) NO3– is reduced in preference to hydronium ion. 

Answer    D


Question. Sugarcane on reaction with nitric acid gives
(a) CO2 and SO2
(b) (COOH)2
(c) 2HCOOH(two moles)
(d) no reaction. 

Answer     B


Question. Which of the following phosphorus is the most reactive?
(a) Scarlet phosphorus
(b) White phosphorus
(c) Red phosphorus
(d) Violet phosphorus

Answer   B


Question. Each of the following is true for white and red phosphorus except that they
(a) are both soluble in CS2
(b) can be oxidised by heating in air
(c) consist of the same kind of atoms
(d) can be converted into one another.

Answer    A


Question. A compound ‘X’ upon reaction with H2O produces a colourless gas ‘Y’ with rotten fish smell. Gas ‘Y’ is absorbed in a solution of CuSO4 to give Cu3P2 as one of the products. Predict the compound ‘X’.
(a) Ca3P2
(b) NH4Cl
(c) As2O3
(d) Ca3(PO4)2

Answer   A


Question. PH4I + NaOH forms
(a) PH3
(b) NH3
(c) P4O6
(d) P4O10

Answer   A

Please click on below link to download pdf file for CBSE Class 12 Chemistry The p Block Elements Notes and Questions

Free study material for Chemistry

CBSE Class 12 Chemistry Assignments for Unit 07 The P-Block Elements

Chapter Practice Questions for Class 12 Chemistry

Explore reliable practice questions for Unit 07 The P-Block Elements tailored for Class 12 learners. Use these structured worksheets to evaluate preparedness and strengthen core problem-solving skills.

Key Advantages of Solving Unit 07 The P-Block Elements Assignments

  • Syllabus Compliance: Sets reflect current CBSE evaluation criteria and official marking frameworks.
  • Multi-Format Practice: Includes varied problem types designed to deepen comprehension across all sub-topics.
  • Time Management: Routine practice optimizes pacing to finish school examinations comfortably within schedule.

Effective Strategy for Class 12 Chemistry Assignments

  1. Textbook Review: Always study the core NCERT book for Class 12 Chemistry prior to beginning the assignment.
  2. Independent Attempt: Solve Unit 07 The P-Block Elements questions on your own initially before cross-checking with expert solutions.
  3. Error Tracking: Record challenging concepts in a dedicated notebook and practice online MCQ tests for revision.

FAQs

Where can I download the latest CBSE Class 12 Chemistry Unit 07 The P-Block Elements assignments?

You can download free PDF assignments for Class 12 Chemistry Unit 07 The P-Block Elements from StudiesToday.com. These practice sheets have been updated for the 2026-27 session covering all concepts from latest NCERT textbook.

Do these Chemistry Unit 07 The P-Block Elements assignments include solved questions?

Yes, our teachers have given solutions for all questions in the Class 12 Chemistry Unit 07 The P-Block Elements assignments. This will help you to understand step-by-step methodology to get full marks in school tests and exams.

Are the assignments for Class 12 Chemistry Unit 07 The P-Block Elements based on the 2026 exam pattern?

Yes. These assignments are designed as per the latest CBSE syllabus for 2026. We have included huge variety of question formats such as MCQs, Case-study based questions and important diagram-based problems found in Unit 07 The P-Block Elements.

How can practicing Unit 07 The P-Block Elements assignments help in Chemistry preparation?

Practicing topicw wise assignments will help Class 12 students understand every sub-topic of Unit 07 The P-Block Elements. Daily practice will improve speed, accuracy and answering competency-based questions.

Can I download Chemistry Unit 07 The P-Block Elements assignments for free on mobile?

Yes, all printable assignments for Class 12 Chemistry Unit 07 The P-Block Elements are available for free download in mobile-friendly PDF format.