p-Block Elements Quiz - ICSE Class 12 Chemistry

Free practice quiz: p-Block Elements (ICSE Class 12 Chemistry). 39 multiple-choice questions with answers and explanations. Play online, no sign-up needed.

This ICSE Class 12 Chemistry practice quiz has 39 multiple-choice questions on p-Block Elements, and 39 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 is the strongest oxidizing agent among the halogens?

   1. Chlorine
   2. Bromine
   3. Iodine
   4. Fluorine
   Show answer

   Answer: D. Fluorine

   Fluorine is the most electronegative element and has the highest electron affinity, making it the strongest oxidizing agent among the halogens. It readily accepts electrons and oxidizes other substances.

2. Which of the following is NOT a property of noble gases?

   1. Monatomic
   2. Highly reactive
   3. Colorless and odorless
   4. Low boiling points
   Show answer

   Answer: B. Highly reactive

   Noble gases (Group 18) are known for their extremely low reactivity due to their stable electron configuration with a full valence shell. They are monatomic, colorless, odorless, and have very low boiling points.

3. Which element exhibits the maximum number of oxidation states?

   1. Sulfur
   2. Chlorine
   3. Phosphorus
   4. Bromine
   Show answer

   Answer: A. Sulfur

   Sulfur (atomic number 16) has the electronic configuration [Ne] 3s² 3p⁴. It can exhibit oxidation states from -2 (in sulfides) to +6 (in sulfates and related compounds), including +2, +4, and +0. This wide range is due to the availability of d-orbitals for hybridization.

4. The decreasing order of reducing character of halogens as halide ions is:

   1. I⁻ > Br⁻ > Cl⁻ > F⁻
   2. F⁻ > Cl⁻ > Br⁻ > I⁻
   3. Cl⁻ > Br⁻ > I⁻ > F⁻
   4. I⁻ > Cl⁻ > Br⁻ > F⁻
   Show answer

   Answer: A. I⁻ > Br⁻ > Cl⁻ > F⁻

   Reducing character as halide ions increases with decreasing ionization energy and increasing atomic size. Iodine is the largest and has the lowest ionization energy, making I⁻ the strongest reducing agent. Fluoride ion (F⁻) is the weakest reducing agent.

5. The acidic strength of the oxides of the third period elements increases in the order:

   1. Na2O < MgO < Al2O3 < SiO2 < P4O10 < SO2 < Cl2O7
   2. Cl2O7 < SO2 < P4O10 < SiO2 < Al2O3 < MgO < Na2O
   3. Na2O < MgO < Al2O3 < SiO2 < SO2 < P4O10 < Cl2O7
   4. Cl2O7 < P4O10 < SO2 < SiO2 < Al2O3 < MgO < Na2O
   Show answer

   Answer: A. Na2O < MgO < Al2O3 < SiO2 < P4O10 < SO2 < Cl2O7

   Across a period, the acidic strength of oxides increases due to increasing electronegativity and non-metallic character. The order of acidic strength of oxides of third-period elements is: basic oxides (Na2O, MgO) < amphoteric oxide (Al2O3) < acidic oxides (SiO2, P4O10, SO2, Cl2O7). The acidic strength further increases from SiO2 to Cl2O7.

More questions in this quiz

Answers and explanations are in the full quiz.

1. The anomalous behavior of Boron is due to:
2. The inert pair effect is most pronounced in:
3. Which of the following compounds exhibits hydrogen bonding?
4. Ozone (O3) is an allotrope of oxygen. What is its primary role in the stratosphere?
5. Which of the following is amphoteric?
6. What type of bonding is present in B2H6 (diborane)?
7. Which allotrope of carbon is used as a lubricant?
8. The thermal decomposition of ammonium dichromate produces:
9. Which of the following is the most stable allotrope of sulfur at room temperature?
10. The hybridization of the central atom in XeF4 is:
11. The compound which is used in the synthesis of Teflon is:
12. Which element in Group 15 forms the most acidic oxide?
13. The reason for the lower boiling point of H2O compared to H2S, H2Se, and H2Te is:
14. The catalytic activity of halogens generally decreases in the order:
15. Which allotrope of carbon is responsible for the sharp tip of a pencil?
16. The Lewis acid character of boron halides (BX3) increases in the order:
17. Which of the following is a product of the reaction between chlorine and hot, concentrated NaOH?
18. The compound XeF6 can be prepared by the direct reaction of Xenon with excess fluorine at high temperature and pressure. What is the hybridization of Xenon in XeF6?
19. Which of the following is the most stable allotrope of carbon and is used in jewelry?
20. What is the common name for the allotrope of phosphorus that is highly toxic and pyrophoric?
21. Which element in Group 14 exhibits catenation to the greatest extent?
22. The property that is NOT shown by Group 18 elements is:
23. Which oxide of nitrogen is used as an anaesthetic in dentistry?
24. Which of the following is the most stable interhalogen compound?
25. Which allotrope of carbon has a structure similar to graphite but with the carbon atoms in a hexagonal planar arrangement forming tubes?
26. The decreasing order of boiling points of hydrides of Group 15 elements is:
27. Which halide of chlorine is the most stable?
28. Which of the following is an example of a noble gas compound formed with a non-metal other than fluorine?
29. The bond angle in NH3 is approximately 107°, while in PH3 it is approximately 94°. This difference is primarily due to:
30. Which allotrope of carbon is an excellent conductor of electricity and heat?
31. When SO2 gas is passed through an acidified solution of K2Cr2O7, the orange color of K2Cr2O7 changes to:
32. Which of the following is the weakest oxidizing agent among the halogens?
33. The compound XeF2 can be prepared by reacting Xenon with excess Fluorine at approximately 400°C. What is the hybridization of Xenon in XeF2?
34. Which element in Group 13 exhibits metallic character most strongly?

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