Post Utme Chemistry Questions
Question 681:
The number of moles in 44.8 dm³ of gas at STP is:
- A 2 moles exactly
- B 4 moles exactly
- C 1 mole exactly
- D 3 moles exactly
Question 682:
In the equation Hâ‚‚ + Clâ‚‚ → 2HCl, the ratio of chlorine to hydrogen chloride is:
- A 1 : 1 ratio
- B 3 : 1 ratio
- C 1 : 2 ratio
- D 2 : 1 ratio
Question 683:
What mass of methane, CHâ‚„, equals 3 moles?
- A 16 g exactly
- B 48 g exactly
- C 64 g exactly
- D 32 g exactly
Question 684:
In the reaction 2Na + 2Hâ‚‚O → 2NaOH + Hâ‚‚, bubbles are formed because:
- A Sodium becomes solid
- B Oxygen gas is produced
- C Hydrogen gas is released
- D Water changes colour
Question 685:
The equation 2FeCl₃ + 3Mg → 3MgClâ‚‚ + 2Fe shows magnesium:
- A Forming precipitate
- B Decomposing chlorine
- C Displacing iron
- D Reducing pressure