Chemistry problems
- 1. The first metal used by man was
Options- A. iron
- B. copper
- C. gold
- D. bronze Discuss
Correct Answer: copper
- 2. The most electronegative element among the following is
Options- A. sodium
- B. bromine
- C. fluorine
- D. oxygen Discuss
Correct Answer: fluorine
- 3. 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
Correct Answer: 4.00 gram
- 4. The National Chemical Laboratory is situated in
Options- A. New Delhi
- B. Bangalore
- C. Pune
- D. Patna Discuss
Correct Answer: Pune
- 5. 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
Correct Answer: N3- > O2- > F- > Na+
- 6. The monomer of polythene is
Options- A. vinyl chloride
- B. ethylene
- C. ethyl alcohol
- D. None of the above Discuss
Correct Answer: ethylene
- 7. The method of concentrating the ore which makes use of the difference in density between ore and impurities is called
Options- A. liquation
- B. leaching
- C. levigation
- D. magnetic separation Discuss
Correct Answer: levigation
- 8. The gas used for artificial ripening of green fruit is
Options- A. ethylene
- B. ethane
- C. carbon dioxide
- D. acetylene Discuss
Correct Answer: ethylene
- 9. The most electropositive elements among the following is
Options- A. Na
- B. Ca
- C. K
- D. Cs Discuss
Correct Answer: Cs
- 10. The inexpensive and commonly used variety of glass is called soda glass. It is called so because
Options- A. was used initially for making bottles of soda(carbonated drink)
- B. is made using soda(sodium carbonate)
- C. was initially used for storing sodium carbonate
- D. is made using soda lime Discuss
Correct Answer: is made using soda(sodium carbonate)
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