Which of the following acids is called the king of the acids?

Options

A. acetic acid
B. phosphoric acid
C. oxalic acid
D. sulphuric acid

Explanation

**Step-by-Step Solution:**

1. **Identify the Question:** The question asks which acid is referred to as the "king of acids."

2. **Recall Acid Names:** Consider the common strong acids, which include hydrochloric acid (HCl), nitric acid (HNO3), and sulfuric acid (H2SO4).

3. **Determine the Strongest Acid:** Among these acids, sulfuric acid (H2SO4) is known for its strength and versatility in various chemical reactions.

4. **Understand the Significance:** Sulfuric acid is widely used in chemical industries and laboratories due to its strong acidic properties and ability to participate in many chemical reactions.

5. **Conclude the Answer:** Based on its strength and applications, sulfuric acid (H2SO4) is known as the "king of acids."

**Final Answer:** The acid known as the king of acids is sulfuric acid (H2SO4).

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