The metal which is present in brass, bronze and German silver is

Options

A. Mg
B. Zn
C. Cu
D. Al

Explanation

To solve the question about the metal present in brass, bronze, and German silver, let's break it down step by step:

### Step 1: Identify the Composition of Brass
Brass is an alloy primarily made of:
- **Copper (Cu)**: 66%
- **Zinc (Zn)**: 34%

### Step 2: Identify the Composition of Bronze
Bronze is another alloy, and its composition is:
- **Copper (Cu)**: 88%
- **Tin (Sn)**: 12%

### Step 3: Identify the Composition of German Silver
German silver, also known as nickel silver, consists of:
- **Copper (Cu)**: 60%
- **Zinc (Zn)**: 20%
- **Nickel (Ni)**: 20%

### Step 4: Compare the Common Metals in Alloys
Now, let's find the common metal in all three alloys:
- **Brass** contains Copper and Zinc.
- **Bronze** contains Copper and Tin.
- **German Silver** contains Copper, Zinc, and Nickel.

### Step 5: Conclusion
The metal that is present in all three alloys (brass, bronze, and German silver) is **Copper (Cu)**.

### Final Answer
The metal which is present in brass, bronze, and German silver is **Copper**.

---