P-Block Elements Quiz - CBSE Class 11 Science
Free practice quiz: P-Block Elements (CBSE Class 11 Science). 20 multiple-choice questions with answers and explanations. Play online, no sign-up needed.
Play all 20 questions freeSample questions
Which of the following elements belongs to the p-block?
- Sodium (Na)
- Magnesium (Mg)
- Chlorine (Cl)
- Potassium (K)
Show answer
Answer: C. Chlorine (Cl)
Chlorine is a p-block element because its valence electrons are in the p-orbital.
What is the oxidation state of nitrogen in HNO₃?
- +1
- +3
- +5
- -3
Show answer
Answer: C. +5
The oxidation state of oxygen is usually -2. Let x be the oxidation state of N. Then x + 3(-2) + 1(1) = 0, solving for x gives +5.
What is the role of boron in plants?
- Formation of chlorophyll
- Component of enzymes
- Formation of cell walls
- All of the above
Show answer
Answer: D. All of the above
Boron plays crucial roles in plant growth including chlorophyll formation, enzyme activity, and cell wall formation.
Explain the diagonal relationship between beryllium and aluminium.
- Similar atomic radii
- Similar electronegativity
- Similar charge density
- All of the above
Show answer
Answer: D. All of the above
Beryllium and aluminium show a diagonal relationship due to similar charge density, electronegativity, and atomic radii.
Compare and contrast the properties of white phosphorus and red phosphorus.
- White phosphorus is more reactive and toxic than red phosphorus
- Red phosphorus is more reactive and toxic than white phosphorus
- Both have identical properties
- Neither is reactive or toxic
Show answer
Answer: A. White phosphorus is more reactive and toxic than red phosphorus
White phosphorus is highly reactive and toxic due to its tetrahedral structure, while red phosphorus is less reactive and less toxic due to its polymeric structure.