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.

This CBSE Class 11 Science practice quiz has 20 multiple-choice questions on P-Block Elements, and 20 of them come with an explanation. Try the 5 sample questions below (tap an option to check yourself), then play the full quiz online. No sign-up needed.

Sample questions

1. Which of the following elements belongs to the p-block?

   1. Sodium (Na)
   2. Magnesium (Mg)
   3. Chlorine (Cl)
   4. Potassium (K)
   Show answer

   Answer: C. Chlorine (Cl)

   Chlorine is a p-block element because its valence electrons are in the p-orbital.

2. What is the oxidation state of nitrogen in HNO₃?

   1. +1
   2. +3
   3. +5
   4. -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.

3. What is the role of boron in plants?

   1. Formation of chlorophyll
   2. Component of enzymes
   3. Formation of cell walls
   4. 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.

4. Explain the diagonal relationship between beryllium and aluminium.

   1. Similar atomic radii
   2. Similar electronegativity
   3. Similar charge density
   4. 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.

5. Compare and contrast the properties of white phosphorus and red phosphorus.

   1. White phosphorus is more reactive and toxic than red phosphorus
   2. Red phosphorus is more reactive and toxic than white phosphorus
   3. Both have identical properties
   4. 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.

More questions in this quiz

Answers and explanations are in the full quiz.

1. What is the general electronic configuration of p-block elements?
2. Which group in the periodic table contains the most reactive nonmetals?
3. Explain the trend in atomic size across a period in the p-block.
4. Which p-block element is a liquid at room temperature?
5. Describe the allotropy of phosphorus.
6. Explain the anomalous behavior of nitrogen compared to other group 15 elements.
7. Discuss the trend in the oxidizing power of halogens.
8. Explain the concept of catenation and its relation to p-block elements.
9. Why are the noble gases generally unreactive?
10. Describe the structure and bonding in graphite.
11. Discuss the applications of noble gases.
12. Explain the different types of hydrides formed by p-block elements and their properties.
13. Discuss the environmental impact of phosphorus and its compounds.
14. Explain the synthesis and applications of boranes.
15. Describe the structure and bonding in silicates and their different types.

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