Post Utme Chemistry Questions
Question 611:
Air is best described scientifically as a:
- A Compound of oxygen
- B Pure gaseous element
- C Single molecular substance
- D Mixture of gases
Question 612:
Water purification by filtration mainly removes:
- A Permanent hardness ions
- B Suspended solid particles
- C Invisible water vapour
- D Dissolved mineral salts
Question 613:
The reaction 4Na + Oâ‚‚ → 2Naâ‚‚O forms sodium oxide through:
- A Decomposition reaction
- B Neutralization reaction
- C Combination reaction
- D Precipitation reaction
Question 614:
The symbol written after a product to show gas escaping is usually:
- A Plus sign
- B Equal sign
- C Downward arrow
- D Upward arrow
Question 615:
Carbon monoxide is dangerous mainly because it:
- A Supports rapid combustion
- B Produces acid rain directly
- C Prevents oxygen transportation
- D Increases atmospheric nitrogen