Chemistry problems
- 1. The mass number of an atom is equal to
Options- A. the number of protons
- B. the number of protons and electrons
- C. the number of nucleons
- D. the number of neutrons Discuss
Correct Answer: the number of nucleons
- 2. The ore which is found in abundance in India is
Options- A. monazite
- B. fluorspar
- C. bauxite
- D. magnetite Discuss
Correct Answer: monazite
- 3. The items amenable to detection by soft x-rays are
Options- A. contrabands
- B. lead in bullets
- C. narcotics
- D. genuine coins from counterfeit coins Discuss
Correct Answer: genuine coins from counterfeit coins
- 4. The material which can be deformed permanently by heat and pressure is called a
Options- A. thermoplastic
- B. thermoset
- C. chemical compound
- D. polymer Discuss
Correct Answer: thermoset
- 5. The octane number of zero is assigned to
Options- A. 2-methyl octane
- B. n-heptane
- C. iso-octane
- D. 3-methyl octane Discuss
Correct Answer: n-heptane
- 6. The method that cannot be used for removing permanent hardness of water is
Options- A. adding sodium carbonate
- B. distillation
- C. adding caustic soda
- D. boiling Discuss
Correct Answer: boiling
- 7. The molecular formula of phosphorous is
Options- A. P1
- B. P2
- C. P3
- D. P4 Discuss
Correct Answer: P4
- 8. The ionisation energy of hydrogen atom in the ground state is x KJ. The energy required for an electron to jump from 2nd orbit to 3rd orbit is
Options- A. 5x/36
- B. 5x
- C. 7.2 x
- D. x/6 Discuss
Correct Answer: 5x/36
- 9. The most important ore of aluminium is
Options- A. bauxite
- B. magnetite
- C. haematite
- D. monazite Discuss
Correct Answer: bauxite
- 10. The nucleus of a hydrogen atom consists of
Options- A. 1 proton only
- B. 1 proton + 2 neutron
- C. 1 neutron only
- D. 1 electron only Discuss
Correct Answer: 1 proton only
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