Question

Match the following
A
1. causes scale
2. basic oxide
3. test for hardness of water
4. acidic oxide

B
a. calcium oxide
b. soap
c. sulphur dioxide
d. calcium bicarbonate
e. neutral oxide
f. does not react with water

Answer 1

Calcium bicarbonate is one of the compounds to cause hardness in water, which in turn causes scale. (1-d)

Calcium oxide is a basic oxide. (2-a)

A test for the hardness of water is to simply use soap in it as originally the ability of the water to precipitate it was used as the measure for its hardness. (3-b)

An acidic oxide is sulphur dioxide. (4-c)

Answer 2

Answer: calcium bicarbonate

Explanation: