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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. The correct statement is
2. Table sugar is
3. The poisonous substance that is the main constituent of tobacco is
4. The statement that is NOT correct is
5. The weight of a rusted iron object compared to that of an unrusted one is
6. Ethyl alcohol is commonly made unfit for drinking by the addition of
7. The medicines are most effective, if they are administered in the
8. The metal that does not give H2 on treatment with dilute HCl is
9. The high reactivity of fluorine is due to
10. The chief constituent of gobar gas is
11. The substances used in the manufacture of stainless steel are
1. Chromium
2. Iron
3. Copper
4. Steel
The correct answers are:
12. The members of a homologous series have
13. A molecule whose electrons are distributed unsymmetrical is said to be
14. Philosopher’s wool contains zinc as its
15. Ammonia is
1. Made up of nitrogen and hydrogen
2. Acidic in nature
3. Prepared by the Haber process
4. Soluble in water
The correct answers are:
16. Elements that show the properties of both metals and non-metals are called
17. According to Einstein's mass -energy relation
18. Which of the following is always found in a free state in nature?
19. Which of the following cannot be purified by sublimation?
20. Consider the following statements
1. Large cold storage plants use ammonia as refrigerant while domestic refrigerators use chlorofluorocarbons.
2. Ammonia can be liquefied at ambient temperatures and at low pressures.
3. Chlorofluorocarbons are air pollutants.
The correct statement(s) is/are:
21. The radioactive pollution may result from:
1. medical waste
2. coal ash
3. production of nuclear arsenal
4. mining of uranium
5. decommissioning of nuclear weapons
The correct causes are:
22. Hydrogen diffuses . . . . . . . . . . chlorine
23. The gas inside an electric bulb is
24. The main constituents of biogas are
25. Consider the following methods by which gene therapy can be performed:
1. By introducing a new gene into the body
2. By the use of stem cells
3. By delivery of genes using gold nanoparticles
The correct methods could be:

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