Chapter 2: p-Block Elements-I — Online MCQ Test
CHEMISTRY · CLASS 12th · Tamil Nadu State Board
Practice Chapter 2: p-Block Elements-I with a free chapter-wise online MCQ test.
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....
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Chapter 2: p-Block Elements-I — Important Questions & Answers
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.
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.
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.
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?
- A. Diamond
- B. Graphite
- C. Charcoal
- D. Fullerene
Answer: B. Graphite
Graphite is soft and slippery due to layered structure and conducts electricity because of delocalised electrons.
Graphite is soft and slippery due to layered structure and conducts electricity because of delocalised electrons.
Which of the following pairs is correctly matched?
- A. Borax glass — used for making jewelry
- B. Boric acid — used as an antiseptic
- C. Graphite — used as a drying agent
- D. Diamond — used as a lubricant
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.
Boric acid is used as a mild antiseptic. The other uses are incorrect for the given substances.