1(xiv)
A teacher demonstrated four different reactions as shown in the diagram below:
Which reactions will produce water?
- (a)1 and 2
- (b)1 and 3
- (c)3 and 4
- (d)2 and 3
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3 and 4
Reason — Reaction 3 is the combustion of ethanol, which produces carbon dioxide and water. Reaction 4 is dilute sulphuric acid reacting with magnesium carbonate, which produces a salt, water and carbon dioxide. Hence, reactions 3 and 4 produce water.