(Increases, decreases, positive, efficient, 68, non-efficient, no `alpha`-hydrogen, negative, Rosenmund's, greater, Cannizzaro, 74, commonion effect, lesser, buffer action, diamagnetic, paramagnetic)
The transition metals show_________character because of the presence of unpaired electrons and `Cu^(+)` is________because its electronic configuration is `[Ar]3d^(10)`.

Explanation

To solve the question, we need to fill in the blanks with the appropriate terms based on the properties of transition metals and the electronic configuration of Cu⁺.

1. **Understanding the Character of Transition Metals**:
Transition metals are known for their magnetic properties, which arise from the presence of unpaired electrons in their d-orbitals. The presence of these unpaired electrons gives rise to paramagnetism.

**Fill in the first blank**:
The transition metals show **paramagnetic** character because of the presence of unpaired electrons.

...