Question

1Which test could be used to show that a sample of water is pure?
A It freezes at exactly 00C.
B It evaporates on heating.
C When It evaporates on heating, it leaves no residue.
D It changes the colour of litmus paper.

Answer 1

Answer:

$\huge \underline \mathfrak \red{Answer}$

The purity of water can be tested by evaporating it (to dryness) on an evaporating dish or by measuring its boiling point.

Answer 2

Answer:

C When it evaporates on heating, it leaves no residue.