Chemistry problems
- 1. The following are the half lives of four active isotopes. Which one of the following is the most dangerous to handle?
Options- A. 3 billion years
- B. 100 years
- C. 0.01 minute
- D. 13 days Discuss
Correct Answer: 0.01 minute
- 2. The number of electrons presents in H+ is
Options- A. zero
- B. one
- C. two
- D. three Discuss
Correct Answer: zero
Explanation:
H+ is a hydrogen ion, and it is an ion because it LOST an electron. Electrons are negatively charged. When an atom gains electrons it will have NEGATIVE charges.
So it has zero electron.
- 3. The inherited traits of an organism are controlled by
Options- A. RNA molecules
- B. nucleotides
- C. DNA molecules
- D. enzymes Discuss
Correct Answer: DNA molecules
- 4. The number of waves made by an electron moving in an orbit having maximum magnetic quantum number is +3
Options- A. 4
- B. 5
- C. 2
- D. zero Discuss
Correct Answer: 4
- 5. The number of atoms present in 21.6 gram of silver (atomic weight = 108) are same as the molecules in
Options- A. 1.8 gram of H2O
- B. 12 moles of KMnO4
- C. 0.6N H2SO4
- D. 4.6 gram of C2H5OH Discuss
Correct Answer: 12 moles of KMnO4
- 6. The most commonly used bleaching agent is
Options- A. alcohol
- B. carbon dioxide
- C. chlorine
- D. sodium chlorine Discuss
Correct Answer: chlorine
- 7. The metal used to recover copper from a solution of copper sulphate is
Options- A. Na
- B. Ag
- C. Hg
- D. Fe Discuss
Correct Answer: Fe
- 8. The main active constituent of tea and coffee is
Options- A. nicotine
- B. chlorophyll
- C. caffeine
- D. aspirin Discuss
Correct Answer: caffeine
- 9. The major constituent of air is
Options- A. nitrogen
- B. carbon dioxide
- C. oxygen
- D. hydrogen Discuss
Correct Answer: nitrogen
- 10. Equal masses of oxygen, hydrogen and methane are kept under identical conditions. The ratio of the volumes of gases will be
Options- A. 2 : 16 : 2
- B. 2 : 16 : 1
- C. 1 : 16 : 2
- D. 1 : 1 : 1 Discuss
Correct Answer: 1 : 16 : 2
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