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Science Test Space
Class 8
Acids, bases and salts
Textbook questions
7.
Answer in brief V
Question:
4
m.
1
.
Correct the mistakes:
a
.
Washing soda is used for making cakes and bread soft, spongy.
b
.
Calcium sulphate hemihydrate is used in textile industry.
a
.
Bleaching powder is used for making cakes and bread soft, spongy.
Plaster of Paris is used for making cakes and bread soft, spongy.
Baking soda is used for making cakes and bread soft, spongy.
b
.
Calcium oxychloride is used in textile industry.
Calcium nitrate hemihydrate is used in textile industry.
Calcium sulphate hemihydrate is used in textile industry.
2
.
What is neutralization reaction? Give an example.
Acids and bases react with one another to produce
salt and hydrogen gas
salt and carbon dioxide
salt and water
.
Example:
\(KOH + HCl ➝ KCl + H_2O\)
\(NaOH + HF ➝ NaH + H_2O+CO_2\)
\(CaOH + HCl ➝ CaCl + H_2\)
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