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- Question
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
- Correct Answer
- Phosphorus trisulphide
ExplanationThe 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)
- 1. Harmful bacteria in drinking water cannot be destroyed by
Options- A. Chlorination
- B. boiling
- C. adding caustic soda
- D. ozonisation Discuss
- 2. 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
- 3. The process that takes place in the atom bomb is
Options- A. nuclear fusion
- B. nuclear fission
- C. radioactive disintegration
- D. chemical decomposition Discuss
- 4. Antimony is
Options- A. metal
- B. non metal
- C. non metaloid
- D. metalloid Discuss
- 5. Which of the following is the strongest base?
Options- A. LiCH3
- B. LiF
- C. LiOH
- D. LiNH2 Discuss
- 6. 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
- 7. 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
- 8. Rutherford's alpha-scattering experiment related to the size of the
Options- A. nucleus
- B. atom
- C. electron
- D. neutron Discuss
- 9. Nucleons are
Options- A. protons and neutrons
- B. neutrons and electros
- C. protons and electrons
- D. protons, neutrons and electrons Discuss
- 10. Gamma rays are
Options- A. high energy electrons
- B. low energy electrons
- C. high energy electromagnetic
- D. high energy positrons waves Discuss
Chemistry problems
Search Results
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: metalloid
Correct Answer: LiCH3
Explanation:
The stability of the ions is determined by the energy of the lone pairs. Carbon has the least effective nuclear charge (Zeff) and so the lone pair on the CH3? ion has the highest energy, making it the least stable ion and so the strongest base. The Zeff increases as we move across the period until we get to fluorine which has the greatest Zeff and so its lone pairs have the lowest energy, making F? the least basic ion.
In order of decreasing basicity they are ranked LiCH3 > LiNH2 > LiOH > LiF. We are dealing with the ions F?, OH?, NH2? and CH3? and so the factor which influences their basicity is the stability of the ion compared to its conjugate acid.
Correct Answer: Red and Blue
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.
Correct Answer: nucleus
Correct Answer: protons and neutrons
Correct Answer: high energy electromagnetic
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