What is acids? Give any two examples.
Acids are those chemical substances that gives hydrogen ions when dissolved in water.
For example: HCl -----> H+ + Cl-
H2SO4 -----> 2H+ + SO4--
Write down the uses of salts.
The uses of common salts are:
i. It is used in our food as preservative.
ii. It is used to reduce the hardness of water.
iii. It is used for plastering the fractured bones.
iv. It is used in chemical fertilizer.
v. It is used in dry cell as electrolyte.
vi. It is used to make white pigments of eyes.