Question

In the reaction, 2 Al (s) + 3 Sn+2 (aq) arrow 2 Al+3 (aq) + 3 Sn (s), the reducing agent is:

Answer 1

LEO the lion says GRR

Lose electrons Oxidation
Gain electrons Reduction

A reducing agent is oxidized
A oxidizing agent is reduced

So essentially what you are looking for in this reaction is the reactant that losses electrons.

A loss of electrons is denoted in an increase in the oxidation state or a greater positive charge in the product

Answer 2

So which the + would loose because of oxidation ?

Answer 3

Tin is reduced, so aluminum is the reducing agent.