Learn more about the properties, composition, and structure of substances (elements and compounds) with these Chemistry questions and answers. This Test can be used by students preparing for Chemistry in JAMB, WAEC, NECO or Post UTME.
+7 to +2
+6 to +2
+5 to +2
+4 to +2
Correct answer is A
MnO4(aq) has a charge of −1
Let the oxidation number of Mn in MnO4(aq) be X
Recall, the oxidation number of O2 is −2
∴ X + (-2\times 4) = -1
X - 8 = -1
X = +7
The principle of column chromatography is based on the ability of the constituents to
move at different speeds in the column
dissolve in each other in the column
react with the solvent in the column
react with each other in the column
Correct answer is A
No explanation has been provided for this answer.
decreasing the pressure
decreasing the temperature
the addition of catalyst
increasing the temperature
Correct answer is B
No explanation has been provided for this answer.
Zn(s) + CuSO4(aq) \to ZnSO4(aq) + Cu(s)
In the reaction above, the oxidizing agent is
CuSO4(aq)
ZnSO4(aq)
Cu(s)
Zn(s)
Correct answer is A
No explanation has been provided for this answer.