Discussion
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- Question
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
- Correct Answer
- 1/8
- 1. The maximum number of isomers for an alkene with molecular formula C4H8 is
Options- A. 5
- B. 4
- C. 2
- D. 3 Discuss
- 2. 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
- 3. The formula C6H5-CO-CH3 represents
Options- A. Acetone
- B. Acetic acid
- C. Acetophenone
- D. Phenyl acetate Discuss
- 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
- 5. Zone refining is used for the purification of
Options- A. Au
- B. Ge
- C. Ag
- D. Cu Discuss
- 6. The metal that is usually extracted from sea water is
Options- A. Ca
- B. Na
- C. K
- D. Mg Discuss
- 7. 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
- 8. 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
- 9. The only state in India that produces saffron is
Options- A. Assam
- B. Himachal Pradesh
- C. Jammu and Kashmir
- D. Meghalaya Discuss
- 10. The most ideal region for the cultivation of cotton in India is
Options- A. the Brahmaputra valley
- B. the Indo-Gangetic valley
- C. the Deccan plateau
- D. the Rann of Kutch Discuss
Chemistry problems
Search Results
Correct Answer: 4
Correct Answer: the sum of the number of protons and neutrons present in the nucleus
Correct Answer: Acetophenone
Correct Answer: this acid was first obtained by the distillation of ants
Correct Answer: Ge
Correct Answer: Mg
Correct Answer: Both (a) and (b)
Correct Answer: USA
Correct Answer: Jammu and Kashmir
Correct Answer: the Deccan plateau
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