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- Question
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
- Correct Answer
- chromic acid
ExplanationPassivity 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.
- 1. 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
- 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
- 3. Harmful bacteria in drinking water cannot be destroyed by
Options- A. Chlorination
- B. boiling
- C. adding caustic soda
- D. ozonisation Discuss
- 4. The function of nitrogen in air is
Options- A. to make air a moderate supporter of combustion
- B. to maintain the density of air constant
- C. to prevent the hydrogen in air from exploding
- D. to reduce the poisonous nature of ozone in air Discuss
- 5. The process that takes place in the atom bomb is
Options- A. nuclear fusion
- B. nuclear fission
- C. radioactive disintegration
- D. chemical decomposition Discuss
- 6. Rutherford's alpha-scattering experiment related to the size of the
Options- A. nucleus
- B. atom
- C. electron
- D. neutron Discuss
- 7. Nucleons are
Options- A. protons and neutrons
- B. neutrons and electros
- C. protons and electrons
- D. protons, neutrons and electrons Discuss
- 8. Gamma rays are
Options- A. high energy electrons
- B. low energy electrons
- C. high energy electromagnetic
- D. high energy positrons waves Discuss
- 9. Of the following radiations, the most easily stopped by air
Options- A. alpha - rays
- B. beta - rays
- C. gamma -rays
- D. x - rays Discuss
- 10. In isotopes the number of neutrons are
Options- A. same
- B. different
- C. both
- D. none Discuss
Chemistry problems
Search Results
Correct Answer: Red and Blue
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)
Correct Answer: adding caustic soda
Explanation:
Water containing caustic soda cannot be used for drinking
Correct Answer: to make air a moderate supporter of combustion
Explanation:
If air contained all oxygen and no nitrogen, everything would have burnt off
Correct Answer: nuclear fission
Explanation:
In the atom bomb, isotopes of uranium are disintegrated with the release of a large amount of energy. Hence, the process is nuclear fission.
Correct Answer: nucleus
Correct Answer: protons and neutrons
Correct Answer: high energy electromagnetic
Correct Answer: alpha - rays
Correct Answer: different
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