The effect of the presence of impurities such as carbon and sulphur on iron is that they
give it high tensile strenght
make it malleable and ductile
increase its melting point
lower its melting point
Correct answer is D
No explanation has been provided for this answer.
The impurities formed during the laboratory preparation of chlorine gas are removed by
H2O
NH3
H2SO4
HCl
Correct answer is A
No explanation has been provided for this answer.
M = E/Q
M = EQ
M = Q/E
M = E/2Q
Correct answer is B
No explanation has been provided for this answer.
MnO-4(aq) + Y + 5Fe2+(aq) → Mn2+(aq) + 5Fe2+(aq) + 4H2O(l)
In the equation above, Y is
5H+(aq)
4H+(aq)
10H+(aq)
8H+(aq)
Correct answer is D
No explanation has been provided for this answer.
The diagram above best illustrates the effect of decrease in
concentration
temperature
surface area
pressure
Correct answer is A
No explanation has been provided for this answer.
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