Chemistry problems
- 1. The metallurgical process in which a metal is obtained in a fused state is called
Options- A. smelting
- B. roasting
- C. calcinations
- D. froth floatation Discuss
Correct Answer: smelting
- 2. The heat required to raise the temperature of body by 1 K is called
Options- A. specific heat
- B. thermal capacity
- C. water equivalent
- D. None of the above Discuss
Correct Answer: thermal capacity
- 3. Zone refining is used for the purification of
Options- A. Au
- B. Ge
- C. Ag
- D. Cu Discuss
Correct Answer: Ge
- 4. The Latin word formica means ant. The name formic acid is derived from this Latin word because
Options- A. this acid, in ancient times, was used to eliminate ant-hills
- B. this corrosive acid is secreted by ants to drive away their enemies
- C. this acid was first obtained by the distillation of ants
- D. ants are attracted by the odour of this acid Discuss
Correct Answer: this acid was first obtained by the distillation of ants
- 5. The formula C6H5-CO-CH3 represents
Options- A. Acetone
- B. Acetic acid
- C. Acetophenone
- D. Phenyl acetate Discuss
Correct Answer: Acetophenone
- 6. The mass number of a nucleus is
Options- A. always less than its atomic number
- B. the sum of the number of protons and neutrons present in the nucleus
- C. always more than the atomic weight
- D. a fraction Discuss
Correct Answer: the sum of the number of protons and neutrons present in the nucleus
- 7. The maximum number of isomers for an alkene with molecular formula C4H8 is
Options- A. 5
- B. 4
- C. 2
- D. 3 Discuss
Correct Answer: 4
- 8. The half life period of an isotope is 2 hours. After 6 hours what fraction of the initial quantity of the isotope will be left behind?
Options- A. 1/6
- B. 1/3
- C. 1/8
- D. 1/4 Discuss
Correct Answer: 1/8
- 9. The metal that is usually extracted from sea water is
Options- A. Ca
- B. Na
- C. K
- D. Mg Discuss
Correct Answer: Mg
- 10. The entropy change involved in the isothermal reversible expansion of 2 moles of an ideal gas from a volume of 10 dm3 at 27°C is to a volume of 100 dm3
Options- A. 42.3 J/ mole / K
- B. 38.3 J/ mole / K
- C. 35.8 J/ mole / K
- D. 32.3 J/ mole / K Discuss
Correct Answer: 38.3 J/ mole / K
Explanation:
= =
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