(Increases, decreases, positive, efficient, 68, non-efficient, no `alpha`-hydrogen, negative, Rosenmund's, greater, Cannizzaro, 74, commonion effect, lesser, buffer action, diamagnetic, paramagnetic)
The more_______is standard reduction potential of a metal, the________is its ability to displace hydrogen from acids.

Explanation

To solve the fill-in-the-blank question, we need to understand the relationship between the standard reduction potential of a metal and its ability to displace hydrogen from acids.

### Step-by-Step Solution:

1. **Understanding Standard Reduction Potential**:
- The standard reduction potential (E°) is a measure of the tendency of a chemical species to be reduced (gain electrons). A more positive E° indicates a stronger oxidizing agent, while a more negative E° indicates a stronger reducing agent.

2. **Displacement of Hydrogen from Acids**:
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