Chemistry 2013 WAEC Past Questions

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A substance is said to be impure if

A. its melting point range is wide
B. it dissolves in water with difficult
C. it has a low melting point
D. it is coloured

View Answer & Discuss (3) WAEC 2013

The following factors affect the solubility of a solid in a given solvent except

A. nature of solute
B. nature of solvent
C. pressure
D. temperature

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Consider the reaction represented by the equation: N₂O_4(g) ⇌ 2NO_2(g) ; ∆H = + x kJmol^-1
What happens when the temperature is reduced at equilibrium?

A. Concentration of N ₂O_4(g) decreases
B. Concentration of N ₂O_4(g) increases.
C. Pressure exerted by the gases increases
D. Pressure exerted by the gases remains constant

View Answer & Discuss (1) WAEC 2013

Which of the following cells produce electrical energy from chemical reactions?
l. Lead-acid battery ll. Dry cell III. Deniell cell IV Electrolytic cell

A. l and ll only
B. l, ll, and III only
C. lll and IV only
D. I and III only

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Consider the redox reaction as represented by the following equation: 1_2(aq) + 2S₂O₃^2-_(aq) → 21^-_(aq) + S₄O₆^2-_(aq). Which of the species in the equation is reduced?

A. S₄O₆^2-_(aq)
B. S₄O₃^2-_(aq)
C. 1_2(aq)
D. 1^-_(aq)

View Answer & Discuss (8) WAEC 2013

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