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- Question
The first metal used by man was
Options- A. iron
- B. copper
- C. gold
- D. bronze
- Correct Answer
- copper
- 1. 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
- 2. The major constituent of air is
Options- A. nitrogen
- B. carbon dioxide
- C. oxygen
- D. hydrogen Discuss
- 3. The main active constituent of tea and coffee is
Options- A. nicotine
- B. chlorophyll
- C. caffeine
- D. aspirin Discuss
- 4. The metal used to recover copper from a solution of copper sulphate is
Options- A. Na
- B. Ag
- C. Hg
- D. Fe Discuss
- 5. The most commonly used bleaching agent is
Options- A. alcohol
- B. carbon dioxide
- C. chlorine
- D. sodium chlorine Discuss
- 6. The most electronegative element among the following is
Options- A. sodium
- B. bromine
- C. fluorine
- D. oxygen Discuss
- 7. The mass of one Avogadro number of helium atom is
Options- A. 1.00 gram
- B. 4.00 gram
- C. 8.00 gram
- D. 4 x 6.02 x 1023 gram Discuss
- 8. The National Chemical Laboratory is situated in
Options- A. New Delhi
- B. Bangalore
- C. Pune
- D. Patna Discuss
- 9. The ionic radii of N3-, O2-, F- and Na+ follows the order
Options- A. N3- > O2- > F- > Na+
- B. N3- > Na+ > O2- > F-
- C. Na+ > O2- > N3- > F-
- D. O2- > F- > Na+ > N3- Discuss
- 10. The monomer of polythene is
Options- A. vinyl chloride
- B. ethylene
- C. ethyl alcohol
- D. None of the above Discuss
Chemistry problems
Search Results
Correct Answer: 1 : 16 : 2
Correct Answer: nitrogen
Correct Answer: caffeine
Correct Answer: Fe
Correct Answer: chlorine
Correct Answer: fluorine
Correct Answer: 4.00 gram
Correct Answer: Pune
Correct Answer: N3- > O2- > F- > Na+
Correct Answer: ethylene
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