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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. Many microbes can effect the chemical process of
2. Chlorine atom becomes a chloride ion by
3. The alkali metals have
4. Which of the following statements is not true about diamonds?
5. When zinc reacts with hydrochloric acid, the gas evolved is
6. The electronic repulsion is maximum between
7. Vinegar is acidic in nature due to the presence of
8. The drug, reserprine is used to
9. In preference to nitrogen -oxygen mixture (present in air), a helium -oxygen mixture is used by divers in deep sea because helium
10. A dark purple compound used as an antiseptic and disinfectant is
11. Covalent bonds are mainly found in
12. 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:
13. The gas inside an electric bulb is
14. Common salt is obtained from sea water by the process of
15. The maximum number of covalent bonds formed by nitrogen is
16. The most electronegative element among sodium, bromium, fluorine and oxygen is
17. In order to prevent the corrosion of iron pipes, they are often coated with a layer of zinc. This process is termed as
18. The plants popularly known as 'petro crops' are rich in
1. Carbohydrates
2. Hydrocarbons
3. Proteins
4. Lipids
The correct answer is:
19. Charcoal is
20. Philosopher’s wool contains zinc as its
21. The ammonium ion is
22. 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:
23. The greatest number of compounds are formed by the element
24. Chloromycetin is an
25. Which of the following properties is not true for an alkali metal?

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