1.the tyndall effect cannot be detected in colloids.
true
false
2.in a oxidation-reduction reaction, the oxidizing agent always undergoes reduction.
true
false
3.unsaturated compounds are very reactive.
true
false

1. False

Search in Internet Tyndall effect and you will find that it is the light scattering by particles in a colloid or fine supension.

2. True

The oxidizing agent undergoes reduction when it oxidizes the other agent.

3. True

Unsaturated compounds (chains with double or triple bonds) react easier than saturated compounds (chains with only single bonds)