Question

Which substance gains electron(s)?
A.An oxidising agent
B.A reducing agent
C.A substance that oxidises
D.Reductant

Answer 1

Hint: In redox reaction the substance that gains electron is called reduce and the substance that loses electron is called oxidised. Common oxidizing agents are oxygen, hydrogen peroxide and the halogens.

Complete answer:
In oxidation/reduction reactions, there is a transfer of charge - an electron - from one species to another. Oxidation is the loss of electrons and reduction is a gain in electrons.
An oxidizing agent (oxidant, oxidizer), or oxidising agent (oxidiser) is a substance that has the ability to oxidize other substances in other words to accept their electrons. Oxidizing and reducing agents are key terms used in describing the reactants in redox reactions that transfer electrons between reactants to form products.
Oxidation = The losing of electrons and Reduction = The gaining of electrons
Electron = -1 Charge
Oxidation = Loss of electron(s) = Loss of -1 for each electron, so - (-1) = +1
During oxidation, the charge of the atom or ion INCREASES by the number of electrons lost.
An oxidizing agent, or oxidant, gains electrons and is reduced in a chemical reaction. It is also known as the electron acceptor; the oxidizing agent is normally in one of its higher possible oxidation states because it will gain electrons and be reduced.

Therefore, the correct answer is option (A).

Note: The strongest oxidant in the table is F2, with a standard electrode potential of 2.87 V. This high value is consistent with the high electronegativity of fluorine and tells us that fluorine has a stronger tendency to accept electrons (it is a stronger oxidant) than any other element.