Post Utme Chemistry Questions
Question 616:
The equation Ca(OH)â‚‚ + COâ‚‚ → CaCO₃ + Hâ‚‚O produces:
- A Calcium carbonate
- B Calcium oxide
- C Calcium chloride
- D Calcium sulphate
Question 617:
The reaction 2HCl + CaCO₃ → CaClâ‚‚ + Hâ‚‚O + COâ‚‚ produces bubbles because:
- A Carbon dioxide escapes
- B Hydrogen disappears
- C Calcium oxide precipitates
- D Oxygen gas forms
Question 618:
Water vapour enters the atmosphere mainly through:
- A Respiration inside animals
- B Evaporation from water bodies
- C Combustion of metals
- D Condensation inside clouds
Question 619:
The equation 2PbO + C → 2Pb + COâ‚‚ shows carbon acting as:
- A Reducing agent
- B Catalyst only
- C Oxidizing compound
- D Precipitating agent
Question 620:
The atmospheric gas needed directly for human respiration is:
- A Helium noble gas
- B Nitrogen atmospheric gas
- C Carbon dioxide gas
- D Oxygen gaseous element