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NCERT Based Natural Science - Chemistry Questions For Competitive Exams
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NCERT Based Natural Science - Chemistry Questions For Competitive Exams
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25 Questions

1. Substances containing all the four elements: carbon, hydrogen nitrogen and oxygen are 1. Morphine
2. Nucleic acids
3. Starch
4. Quinine
Select the correct answer by using the code below,
2. Amino acids are the building blocks of
3. Consider the following processes:
1. Evaporation
2. Fractional distillation
3. Distillation 4. Filtration The process(es) involved in the refining of crude oil is/ are:
4. The electron affinity for the inert gases is
5. The substances used in the manufacture of stainless steel are
1. Chromium
2. Iron
3. Copper
4. Steel
The correct answers are:
6. Enzymes are sensitive to
7. Most covalent compounds
8. Anemia occurs due to the lack of the element
9. The chemical name of quartz is
10. Pick the wrong statement: hydrogen bonding results in
11. With increasing bond order, stability of a bond
12. The compound that IS NOT responsible for acid rain is
13. Lime water contains
14. The production of ammonia is important because it is used in the
15. The sources of sulphur dioxide may be:
1. burning of coal
2. solid municipality waste disposal
3. burning of diesel
4. volcanoes
The correct sources are:
16. Hydrogen diffuses . . . . . . . . . . chlorine
17. Consider the following biomolecules:
1. Vitamin A
2. Enzyme
3. Testosterone
4. DNA
The biomolecules that are made in the human body are:
18. Consider the following statements:
1. Mercury metal exists as a liquid at room temperature.
2. The property of metals by which they can be beaten into thin sheets is called malleability
3. Neutral fats such as butter and vegetable oils are mostly triglycerides.
4. The size of an atom is of the order of 10 - 15 m.
The correct statements are:
19. The most electropositive element among the following is
20. Tetraethyl lead (TEL) is added to petrol to
21. The acid present in lemons and oranges is
22. Nitrogen
1. Is non-essential for the animal bodies
2. In air dilutes oxygen which, otherwise, is very active in the pure form
3. Makes oxygen soluble in blood
4. Is present in DNA and RNA
The correct statements are:
23. The most electronegative element among sodium, bromium, fluorine and oxygen is
24. The most abundant source of iron is
25. The drug, reserprine is used to

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