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- Question
The major constituent of air is
Options- A. nitrogen
- B. carbon dioxide
- C. oxygen
- D. hydrogen
- Correct Answer
- nitrogen
- 1. The main active constituent of tea and coffee is
Options- A. nicotine
- B. chlorophyll
- C. caffeine
- D. aspirin Discuss
- 2. The metal used to recover copper from a solution of copper sulphate is
Options- A. Na
- B. Ag
- C. Hg
- D. Fe Discuss
- 3. The most commonly used bleaching agent is
Options- A. alcohol
- B. carbon dioxide
- C. chlorine
- D. sodium chlorine Discuss
- 4. 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
- 5. 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
- 6. 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
- 7. The first metal used by man was
Options- A. iron
- B. copper
- C. gold
- D. bronze Discuss
- 8. The most electronegative element among the following is
Options- A. sodium
- B. bromine
- C. fluorine
- D. oxygen Discuss
- 9. 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
- 10. The National Chemical Laboratory is situated in
Options- A. New Delhi
- B. Bangalore
- C. Pune
- D. Patna Discuss
Chemistry problems
Search Results
Correct Answer: caffeine
Correct Answer: Fe
Correct Answer: chlorine
Correct Answer: 12 moles of KMnO4
Correct Answer: 4
Correct Answer: 1 : 16 : 2
Correct Answer: copper
Correct Answer: fluorine
Correct Answer: 4.00 gram
Correct Answer: Pune
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