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.
Which of these metals CANNOT replace hydrogen from alkaline solutions?
Aluminium
Zinc
Tin
Iron
Correct answer is D
Aluminum, Zinc, and Tin react with both acids and alkalis to liberate hydrogen and so all are amphoteric metals except iron.
+7 to +2
+6 to +2
+5 to +2
+4 to +2
Correct answer is A
\(MnO_{{4}{(aq)}}\) has a charge of \(-1\)
Let the oxidation number of \(Mn\) in \(MnO_{{4}{(aq)}}\) be X
Recall, the oxidation number of \(O_{2}\) is \(-2\)
\(\therefore\) \(X + (-2\times 4) = -1\)
\(X - 8 = -1\)
\(X = +7\)
Naturally radioactive
abundant in nature
a transition metal
an isotopic mixture
Correct answer is D
No explanation has been provided for this answer.
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.