Relevant Titles
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Group 13 & 14 Elements MCQs — CBSE Class 11 Chemistry (NCERT-Based)
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CBSE Class 11 Quiz: Group 13 and 14 Elements & Compounds — Practice Test
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Chapter 11 p-Block Elements MCQs: Boron, Aluminium, Carbon & Silicon
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NCERT-Aligned MCQs for Class 11: Chemistry — Group 13 & 14 Explained
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CBSE Board Exam Practice: 30 MCQs on Group 13 and 14 Elements (Class 11)
Introduction
CBSE Class 11 Chemistry MCQs on Group 13 and 14 elements are essential for mastering Chapter 11 (The p-Block Elements) and boosting your board exam readiness. This NCERT-aligned practice set focuses on the key concepts students must know: electronic configuration and oxidation states, anomalous behavior of boron, amphoterism of aluminium oxide, catenation and allotropy in carbon and silicon, important compounds (AlCl<sub>3</sub>, B<sub>2</sub>H<sub>6</sub>, SiO<sub>2</sub>), and acid–base characteristics of oxides. Each multiple-choice question is designed to test both factual recall and application — interpreting bonding, predicting reactions, and comparing chemical behavior across the group. Answers include short, clear explanations so you can correct mistakes immediately and understand the reasoning behind each choice. Use this practice test under timed conditions to simulate exam pressure, identify weak areas, and revise NCERT diagrams and examples. Regular practice with these MCQs will strengthen fundamentals required for CBSE board exams and provide a solid base for competitive exam preparation like JEE (Main) and other higher-secondary assessments.
Sample MCQs (with answers and explanations)
Q1. Which of the following explains why boron forms covalent compounds rather than ionic ones?
A) Low ionization enthalpy
B) Large atomic radius
C) Small size and high polarizing power
D) High metallic character
Answer: C) Small size and high polarizing power
Explanation: Boron’s small atomic radius and high charge density polarize anion electron clouds, promoting covalency instead of ionic bonding (hence electron-deficient covalent compounds like B<sub>2</sub>H<sub>6</sub>).
Q2. Aluminium oxide (Al<sub>2</sub>O<sub>3</sub>) is described as amphoteric. Which reaction demonstrates this property?
A) Al<sub>2</sub>O<sub>3</sub> + 6HCl → 2AlCl<sub>3</sub> + 3H<sub>2</sub>O
B) Al<sub>2</sub>O<sub>3</sub> + 2NaOH → 2NaAlO<sub>2</sub> + H<sub>2</sub>O
C) Both A and B
D) None of the above
Answer: C) Both A and B
Explanation: Amphoterism means reacting with both acids and bases — Al<sub>2</sub>O<sub>3</sub> forms salts with acids and aluminates with bases.
Q3. Which statement best compares carbon and silicon bonding tendencies?
A) Both form stable multiple bonds equally easily
B) Carbon readily forms multiple bonds; silicon prefers single bonds and extended Si–O networks
C) Silicon commonly forms aromatic rings like carbon
D) Both are predominantly ionic in compounds
Answer: B) Carbon readily forms multiple bonds; silicon prefers single bonds and extended Si–O networks
Explanation: Carbon forms stable C=C and C≡C bonds (catenation); silicon less readily forms Si=Si and instead forms strong Si–O networks (silicates, SiO<sub>2</sub>).
Q4. Which aluminium halide shows the most covalent character in the anhydrous state?
A) AlF<sub>3</sub>
B) AlCl<sub>3</sub> (anhydrous)
C) AlBr<sub>3</sub>
D) AlI<sub>3</sub>
Answer: B) AlCl<sub>3</sub> (anhydrous)
Explanation: Anhydrous AlCl<sub>3</sub> dimerizes to Al<sub>2</sub>Cl<sub>6</sub>, showing covalent character; AlF<sub>3</sub> is the most ionic among aluminium halides.
Q5. Which oxide is a network covalent solid and the major component of glass?
A) CO<sub>2</sub>
B) SiO<sub>2</sub>
C) Al<sub>2</sub>O<sub>3</sub>
D) B<sub>2</sub>O<sub>3</sub>
Answer: B) SiO<sub>2</sub>
Explanation: Silicon dioxide (SiO<sub>2</sub>) forms a strong covalent network and is the principal constituent of silicate glasses and ceramics.