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1997 - JAMB Chemistry Past Questions and Answers - page 3

21

What is the oxidation number of Z in K3ZCl6?

A
-3
B
+3
C
-6
D
+6
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22

2H2S(g) + SO2(g) + H2O(I) → 3S(s) + 3H2O(I)..........(i) 3CuO(s) + 2NH3(g) → 3Cu(s) + 3H2O(I) + N2(g).........(II) In the equations above, the oxidizing agent (I) and the reducing agent in (II) respectively are?

A
H2S and NH3
B
SO2 and CuO
C
SO2 and NH3
D
H2S and CuO
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23

2SO2(g) + O2(g) 2SO3. In the reaction above, the standard heats of formation of SO2(g) and SO3(g) are -297 KJ mol-1 respectively. The heat change of the reaction is?

A
-99 kJ mol-
B
-198 kJ mol-
C
+198 kJ mol-
D
+683kJ mol-
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24

If the rate law obtained for a given reaction is rate = k(X)n (Y)m, what is the overall order of the reaction?

A
nm
B
n/m
C
n + m
D
n - m
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25

One method of driving the position of equilibrium of an endothermic reaction forward is to?

A
increase temperature at constant pressure
B
dcrease pressure at constant temperature
C
cool down the apparatus with water
D
decreases temperature at constant pressure
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26

Oxidation of concentrated hydrochloric acid with manganese (IV) oxide liberates a gas used in the?

A
manufacture of tooth pastes
B
treatment of simple golitre
C
vulcanization of rubber
D
sterilization of water
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27

mE + nF → pG + qH. In the equation above, the equilibrium constant is given by?

A
(E)m(F)n/ (G)n(H)q
B
(E)(F) / (G)(H)
C
(G)p(H)q / (E)m(F)n
D
(G)(H) / (E)(F)
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28

A compound that will NOT produce oxygen on heating is?

A
potasium dioxonitrate (III)
B
lead (IV) oxide
C
potassium trioxochlorate (V)
D
potassium trioxonitrate (V)
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29

Coal gas is made up of carbon (II) oxide, hydrogen and?

A
nitrogen
B
air
C
argon
D
methane
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30

2X(aq) + MnO2(s) + 4H+(aq) → X2(g) + Mn2+(aq) + 2H2O.

The reaction above can be used for the laboratory preparation of all halogens except fluorine because it is?

A
a poisionous gas
B
an oxidizing agent
C
electronegative in nature
D
highly reactive
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