The formula of chloride of a metal is MCI. What is the valency of the metal?

Options

A. 4
B. 3
C. 1
D. 2

Explanation

To determine the valency of the metal in the compound MCl, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Compound**: The given compound is MCl, where M represents the metal and Cl represents chlorine.

2. **Understand the Valency of Chlorine**: Chlorine (Cl) typically has a valency of -1. This means that it can gain one electron to achieve a stable electronic configuration.

3. **Set Up the Equation**: Let the valency of the metal M be represented by x. The overall charge of the compound MCl must be neutral (0). Therefore, we can set up the equation:
\[ x + (-1) = 0 \]

4. **Solve for x**: Rearranging the equation gives us:
\[ x - 1 = 0 \implies x = 1 \]
This means the valency of the metal M is +1.

5. **Conclusion**: The valency of the metal in the compound MCl is 1.

### Final Answer:
The valency of the metal M is 1.

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