Write 'four' uses of hydrochloric acid. , Write chemical formula of the following oxoacids of chlorine :
(a) Hypochlorous acid (b) Chlorous acid
(c) Chloric acid (d) Perchloric acid

Explanation

### Step-by-Step Solution

#### Part 1: Uses of Hydrochloric Acid

1. **Preparation of Aqua Regia**: Hydrochloric acid is used in the preparation of aqua regia, which is a mixture of three parts hydrochloric acid (HCl) and one part nitric acid (HNO3). Aqua regia is known for its ability to dissolve noble metals such as gold.

2. **Manufacture of Glucose**: Hydrochloric acid is utilized in the hydrolysis of starch to produce glucose. The reaction occurs in the presence of dilute hydrochloric acid at a temperature of 393 K and a pressure of 223 atm, resulting in the formation of glucose (C6H12O6).

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