CBSE Class 10 Science MCQs-2 – Chemistry Quiz-1
This Chemistry quiz is based on CBSE Class 10 Science NCERT curriculum. Also, the students from any board (CBSE, IGCSE Cambridge, ICSE, State Boards) can try this quiz out. Ten Questions are given in this Quiz. Choose the best answer from the given choices. 1 point is given for each correct answer. Candidates preparing for competitive exams can try this quiz too.
1. The pH value of a neutral solution is:
2. The valency of an element depends on its:
3. Which base is used in the manufacture of soap?
4. The method used to extract metals of high reactivity is:
5. Which element has the smallest atomic radius?
(i) Periodic Trends: Hydrogen and Helium are located in the same row (Period). Atomic radius decreases across a period (from left to right) on the periodic table due to increasing nuclear charge. The greater positive charge pulls electrons closer to the nucleus. (ii) Helium's Position: Helium is in Group 18 (noble gases) and Period 1. Helium has only one electron shell with a very strong nuclear attraction for its electrons, resulting in the smallest atomic radius. Though Hydrogen has one shell like helium does, hydrogen atom has only one proton and one electron resulting in weaker nuclear attraction.
6. Bleaching powder is chemically known as:
7. Ethanoic acid is also known as:
8. What is the main ore of iron?
9. What is the main pollutant responsible for acid rain?
10. What is the by-product of the saponification process?
In general, Fat/Oil + Sodium Hydroxide → Soap + Glycerol
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