Which of the following group of transition metals is called coinage metals?

Options

A. `Cu,Ag,Au`
B. `Ru,Rh,Pb`
C. `Fe,Co,Ni`
D. `Os,Ir,Pt`

Explanation

To solve the question "Which of the following group of transition metals is called coinage metals?", we can follow these steps:

### Step 1: Understand the term "coinage metals"
Coinage metals are precious metals that have historically been used to mint coins. They are known for their resistance to corrosion and reactivity, making them suitable for use in currency.

**Hint:** Think about metals that are commonly used for making coins and their properties.

### Step 2: Identify the characteristics of coinage metals
Coinage metals are characterized by:
- Low reactivity
- Resistance to corrosion
- Attractive colors

**Hint:** Recall the properties that make certain metals desirable for use in coins.

### Step 3: Recall the group of transition metals
Coinage metals are specifically found in Group 11 of the periodic table. The metals in this group include:
- Copper (Cu)
- Silver (Ag)
- Gold (Au)

**Hint:** Remember the periodic table and the specific group that contains these metals.

### Step 4: Analyze the options provided
If the options given in the question include Cu, Ag, and Au, then this group is the correct answer as they are the recognized coinage metals.

**Hint:** Look for the option that lists these three metals together.

### Step 5: Conclusion
The correct answer to the question is the group of metals consisting of Copper (Cu), Silver (Ag), and Gold (Au), which are known as coinage metals.

**Final Answer:** The group of transition metals called coinage metals is Cu, Ag, Au.