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Chemistry 1995 WAEC Past Questions

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26
Copper (ll) tetraoxosulphate (VI) is often added to swimming pools because it
  • A. prevents the growth of algae
  • B. coagulates suspended particles
  • C. neutralizes dissolved gases in water
  • D. reacts with any excess chlorine present
  • E. increases the amount of dissolved oxygen
View Answer & Discuss (1) WAEC 1995
27
The following salts dissolve readily in cold water except
  • A. CaCI2
  • B. PbSO4
  • C. (NH4)2SO4
  • D. Na2CO3
  • E. Na2SO3
View Answer & Discuss (2) WAEC 1995
28
What is the amount (in mole) of hydrogen gas that would be produced if 0.6 mole of hydrochloric acid reacted with excess zinc according to the following equation? Zn(s) + 2HCI(aq) → ZnCI2(aq) + H2(g)
  • A. 0.1 mole
  • B. 0.2mole
  • C. 0.3 mole
  • D. 1.0 mole
  • E. 2.9 moles
View Answer & Discuss (2) WAEC 1995
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29
What is the amount (in mole) of hydrogen gas that would be produced if 0.6 mole of hydrochloric acid reacted with excess zinc according to the following equation? Zn(s) + 2HCI(aq) → ZnCI2(aq) + H2(g)
  • A. 0.1 mole
  • B. 0.2mole
  • C. 0.3 mole
  • D. 1.0 mole
  • E. 2.9 moles
View Answer & Discuss (2) WAEC 1995
30

(a) State three reasons why air is classified as a mixture.

(b) List two methods that can be used to separate a mixture of iodine crystals and iron filings.

 

 

View Answer & Discuss WAEC 1995
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