CANDIDATES' WEAKNESSES

Candidates

-           could not calculate number of moles;
-           could not give the colour change that would be observed when ZnCO3 is heated strongly and left to stand for a few minutes;
-           could not suggest the name of a compound based on the quantitative analysis of the compound;
-           inability to round off their answers to 3 significant figures.

The following remedies were suggested:

candidates should

• be familiar with the examination syllabus;
• improve on their study habit;
• learn how to write the correct charges on ions;
• learn how to deduce correct inferences from observation.