Read the following and answer any four questions
Sohan went door to door posing as a goldsmith. He promised to bring back the glitter of old and dull gold ornaments. An unsuspecting lady gave a set of gold bangles to him which he dipped in a particular solution. The bangles sparkled like new but their weight was reduced drastically. The lady was sad but after a futile argument, the man beat a hasty retreat.
Which of the following is incorrect?

Options

A. Aqua regia is a strong oxidising agent.
B. Aqua regia is a strong reducing agent.
C. Aqua regia dissolves gold in it.
D. Aqua regia is a mixture of hydrochloric acid and nitric acid.

Explanation

To determine which statement is incorrect regarding the scenario involving Sohan and the gold bangles, we need to analyze the situation step by step.

### Step-by-Step Solution:

1. **Understanding Aqua Regia**:
Aqua regia is a corrosive mixture of concentrated hydrochloric acid (HCl) and concentrated nitric acid (HNO3) in a 3:1 ratio. It is known for its ability to dissolve noble metals like gold and platinum.

**Hint**: Remember that aqua regia is specifically used for dissolving gold and platinum due to its strong oxidizing properties.

2. **Chemical Reaction**:
When HCl and HNO3 are mixed, they react to produce several products, including chlorine gas (Cl2) and nitrogen oxides. The free chlorine produced is responsible for the dissolution of gold.

**Hint**: Focus on the products of the reaction and how they contribute to the dissolution of metals.

3. **Application in Cleaning**:
Aqua regia is often used in laboratories to clean glassware, especially when dealing with residues of noble metals. This property is due to its ability to dissolve metal contaminants.

**Hint**: Consider the practical uses of aqua regia beyond just dissolving metals.

4. **Effect on Gold Bangles**:
In the scenario, Sohan dipped the gold bangles in aqua regia, which made them appear shiny again but reduced their weight. This indicates that the gold was partially dissolved in the process.

**Hint**: Think about what happens to the mass of a substance when it is dissolved in a strong acid.

5. **Identifying the Incorrect Statement**:
The question asks to identify the incorrect statement among the options provided. Since the video transcript does not provide specific statements, we can conclude that any statement claiming aqua regia does not dissolve gold or that it is not a mixture of HCl and HNO3 would be incorrect.

**Hint**: Look for statements that contradict the properties and reactions of aqua regia.

### Conclusion:
Based on the understanding of aqua regia and its effects on gold, the incorrect statement would likely be one that misrepresents its ability to dissolve gold or its composition.

---