Which reducing agent is commonly employed for reduction of
`(a) ZnO "to" Zn`
`(b) Cr_(2)O_(3) "to" Cr`
`(c ) TiCl_(4) "to" Ti`

Explanation

To solve the question regarding the commonly employed reducing agents for the reduction of specific metal oxides and halides, we will analyze each part step-by-step:

### Step 1: Reduction of ZnO to Zn
- **Reaction**: Zinc oxide (ZnO) is reduced to zinc (Zn) using carbon as the reducing agent.
- **Common Reducing Agent**: Coke (which is primarily carbon) is typically used in this reduction process.
- **Reaction Equation**:
\[
\text{ZnO} + \text{C} \rightarrow \text{Zn} + \text{CO}
...