In period 4 of the periodic table, the elements with highest and lowest atomic radii respectively are:
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- K & Se
- K & Br
- Rb & Br
- Na & Cl
The Correct Option is B
Solution and Explanation
Top Questions on Periodic Table
Bauxite is the principal ore used in the commercial extraction of aluminium. The Bayer’s process is used to refine bauxite into pure alumina, with caustic soda playing a crucial role in the initial stage of the process. Based on this, answer the following questions:
(a) Explain the reason behind the addition of caustic soda during the Bayer’s process.
(b) Write a balanced chemical equation representing the reaction between bauxite and caustic soda during the Bayer’s process.
- ICSE Class X board - 2026
- Chemistry
- Periodic Table
- Carbon reacts with an acid to form carbon dioxide, water and nitrogen dioxide.
(a) Name the acid used in the reaction.
(b) Write a balanced chemical equation for the reaction that occurs.
- ICSE Class X board - 2026
- Chemistry
- Periodic Table
Anil is a laboratory assistant in a college. He prepared nitric acid but stored it in a transparent container exposed to sunlight. After a few days, brown fumes were observed in the container and the acid turned slightly yellowish in colour.
(a) What was the error made by Anil while storing the acid?
(b) Why were brown fumes observed in the container?
(c) How can the yellowish tinge in the acid be removed?
- ICSE Class X board - 2026
- Chemistry
- Periodic Table
State whether the following statements are True or False.
(a) Organic compounds having different molecular formula, but same structural formula are called isomers.
(b) A salt is a compound formed by partial or complete replacement of the hydrogen ion of an acid by a metal or electropositive ion.
- ICSE Class X board - 2026
- Chemistry
- Periodic Table
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- JEE Main - 2026
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