Chemistry problems
- 1. Harmful bacteria in drinking water cannot be destroyed by
Options- A. Chlorination
- B. boiling
- C. adding caustic soda
- D. ozonisation Discuss
Correct Answer: adding caustic soda
Explanation:
Water containing caustic soda cannot be used for drinking
- 2. One of the ingredients of the paste on the side of a match box is
Options- A. Phosphorus pentaoxide
- B. Phosphorus trichloride
- C. Phosphorus trisulphide
- D. Phosphorus trioxide Discuss
Correct Answer: Phosphorus trisulphide
Explanation:
The paste applied to the side of a match box is a mixture of phosphorus trisulphide, glass powder (or sand) to cause friction and glue (binding material)
- 3. Wavelength of which of the following colours of the visible spectrum of light are maximally absorbed by green plants________
Options- A. Green and Yellow
- B. Red and Blue
- C. Green and Red
- D. Blue and Yellow Discuss
Correct Answer: Red and Blue
- 4. In addition to nitric acid, another acid which may render iron passive is
Options- A. acetic acid
- B. oxalic acid
- C. chromic acid
- D. citric acid Discuss
Correct Answer: chromic acid
Explanation:
Passivity of iron is due to formation of an extremely thin and impervious film of ferrosoferric oxide on the surface of iron. Chromic acid, being a powerful oxidising agent (like nitric acid ) renders iron passive.
- 5. Rutherford's alpha-scattering experiment related to the size of the
Options- A. nucleus
- B. atom
- C. electron
- D. neutron Discuss
Correct Answer: nucleus
- 6. Nucleons are
Options- A. protons and neutrons
- B. neutrons and electros
- C. protons and electrons
- D. protons, neutrons and electrons Discuss
Correct Answer: protons and neutrons
- 7. Gamma rays are
Options- A. high energy electrons
- B. low energy electrons
- C. high energy electromagnetic
- D. high energy positrons waves Discuss
Correct Answer: high energy electromagnetic
- 8. Of the following radiations, the most easily stopped by air
Options- A. alpha - rays
- B. beta - rays
- C. gamma -rays
- D. x - rays Discuss
Correct Answer: alpha - rays
- 9. In isotopes the number of neutrons are
Options- A. same
- B. different
- C. both
- D. none Discuss
Correct Answer: different
- 10. Which one is not the isotopes of hydrogen
Options- A. Protium
- B. Deuter
- C. Tritium
- D. All Discuss
Correct Answer: Tritium
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