Chemistry 1990 WAEC Past Questions

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Which of the following explains why trioxonitrate (V) acid is not used for preparing hydrogen from metals?

A. it is volatile
B. it is strongly oxidizing
C. it forms a layer of oxide on the metal
D. trioxonitrate (V) salts are soluble in water
E. it renders the metals passive

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Which of the following is normally used for drying ammonia gas?

A. Concentrated tetraoxonitrate (Vl) acid
B. Calcium oxide
C. anhydrous calcium chloride
D. phosphorus (V) oxide
E. anhydrous copper (ll) tetraoxosulphate (VI)

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Nuclear reactions can be used in the following except

A. gauging the thickness of objects
B. making atomic bombs
C. curing cancer
D. generating electricity
E. purifying water

View Answer & Discuss (1) WAEC 1990

The decomposition of hydrogen peroxide is represented by the equation: 2H₂O_(l) + O₂_(g) what mass of hydrogen peroxide would be required to produce 22.4dm₃ of oxygen at s.t.p? (H = 1, O = 16, molar volume of a gas at s.t.p. = 22.4dm₃)

A. 18 g
B. 34 g
C. 36 g
D. 64 g
E. 68 g

View Answer & Discuss (6) WAEC 1990

Which of the following compounds crystallizes without water of crystallization?

A. Na₂CO₃
B. CuSO₄
C. MgSO₄
D. NaCI
E. FeSO₄

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