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- Question
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
- Correct Answer
- the sum of the number of protons and neutrons present in the nucleus
- 1. The formula C6H5-CO-CH3 represents
Options- A. Acetone
- B. Acetic acid
- C. Acetophenone
- D. Phenyl acetate Discuss
- 2. 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
- 3. Zone refining is used for the purification of
Options- A. Au
- B. Ge
- C. Ag
- D. Cu Discuss
- 4. 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
- 5. 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
- 6. The maximum number of isomers for an alkene with molecular formula C4H8 is
Options- A. 5
- B. 4
- C. 2
- D. 3 Discuss
- 7. 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
- 8. The metal that is usually extracted from sea water is
Options- A. Ca
- B. Na
- C. K
- D. Mg Discuss
- 9. Which of the following drainage systems fall into Bay of Bengal?
Options- A. Ganga, Brahmaputra and Godavari
- B. Mahanadi, Krishna and Cauvery
- C. Luni, Narnada and Tapti
- D. Both (a) and (b) Discuss
- 10. Which of the following countries leads in the production of aluminium and its products in the world?
Options- A. Australia
- B. France
- C. India
- D. USA Discuss
Chemistry problems
Search Results
Correct Answer: Acetophenone
Correct Answer: this acid was first obtained by the distillation of ants
Correct Answer: Ge
Correct Answer: thermal capacity
Correct Answer: smelting
Correct Answer: 4
Correct Answer: 1/8
Correct Answer: Mg
Correct Answer: Both (a) and (b)
Correct Answer: USA
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