Chapter Exam

Chapter 2: p-Block Elements-I — Online MCQ Test

Q: Which element shows the maximum tendency to form covalent compounds among Group 13 elements?

Answer: A. Boron — Boron is the smallest and most electronegative among Group 13 elements, so it shows the maximum tendency to form covalent compounds.

Q: Which compound is commonly known as borax?

Answer: A. Na2B4O7·10H2O — Borax is sodium tetraborate decahydrate, with formula Na2B4O7·10H2O.

Q: A student observes a substance that is soft, slippery, and conducts electricity. Which allotrope of carbon is it most likely to be?

Answer: B. Graphite — Graphite is soft and slippery due to layered structure and conducts electricity because of delocalised electrons.

Q: Which of the following pairs is correctly matched?

Answer: B. Boric acid — used as an antiseptic — Boric acid is used as a mild antiseptic. The other uses are incorrect for the given substances.

CHEMISTRY · CLASS 12th · Tamil Nadu State Board

Practice Chapter 2: p-Block Elements-I with a free chapter-wise online MCQ test for Tamil Nadu State Board CLASS 12th CHEMISTRY. This chapter covers: Focusing on group 13 and 14 elements this chapter details trends in physical and chemical properties. Students study preparation properties and uses of boron compounds silicates an.... AI-generated questions from basic to board-exam level, with instant results and explanations.

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Chapter 2: p-Block Elements-I — Important Questions & Answers (FAQ)

Frequently asked questions from Tamil Nadu State Board CLASS 12th CHEMISTRY — Chapter 2: p-Block Elements-I, with answers and explanations. These are sample questions; the exam has its own separate question set.

Which element shows the maximum tendency to form covalent compounds among Group 13 elements?

A. Boron ✓
B. Aluminium
C. Gallium
D. Thallium

Answer: A. Boron
Boron is the smallest and most electronegative among Group 13 elements, so it shows the maximum tendency to form covalent compounds.

Which compound is commonly known as borax?

A. Na2B4O7·10H2O ✓
B. H3BO3
C. B2O3
D. NaBO2

Answer: A. Na2B4O7·10H2O
Borax is sodium tetraborate decahydrate, with formula Na2B4O7·10H2O.

Why is boron unable to form B3+ ions easily?

A. Because it has a large atomic radius
B. Because of its high ionisation energy and small size ✓
C. Because it has vacant d-orbitals
D. Because it is highly electropositive

Answer: B. Because of its high ionisation energy and small size
Due to its very small size and high ionisation energy, boron cannot form stable B3+ ions easily and prefers covalent bonding.

A student observes a substance that is soft, slippery, and conducts electricity. Which allotrope of carbon is it most likely to be?