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286
In which of the following compounds is the oxidation number of nitrogen equal to + 3?
A.
NO
2
B.
N
2
O
C.
NO
D.
HNO
2
E.
HNO
3
View Answer & Discuss
WAEC 1996
287
Which of the following statements is not correct about electrolysis?
A.
Reduction occurs at the anode
B.
Anions migrate to the anode
C.
Positive ions migrate to the cathode
D.
Concentration affects the discharge of ions
E.
Electrolytes conduct electric current
View Answer & Discuss (1)
WAEC 1996
288
Which of the following is not correct about a catalyst? It
A.
remains unchanged chemically at the end of a reaction
B.
helps to establish equilibrium faster reversible reaction
C.
can start a chemical rection which will normally not take place
D.
is usually specific in its action
E.
alters the rate of chemical reaction
View Answer & Discuss (3)
WAEC 1996
289
The rate of production of hydrogen gas from the reaction between zinc granules and hydrochloric acid can be increased by
A.
cooling the reaction mixture
B.
using zinc powder instead of zinc granules
C.
using zinc rod instead of zinc granules
D.
carrying out the reaction at a higher pressure
E.
carrying out the reaction in a closed vessel
View Answer & Discuss
WAEC 1996
290
What does X represent in the following equation? H
2(g)
+ 1/2O
2(g)
→ H
2
O
(l)
; ∆H = xKJ.
A.
Bond energy
B.
Activation energy
C.
Ionization energy
D.
Enthalpy of neutralization
E.
Enthalpy of formation
View Answer & Discuss
WAEC 1996
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