Which of the following is a reduction half-reaction? no + 2h2o → n3 –+ 4h ++ 3e – na → na ++ e – 2h ++ 2e –→ h2 zn → zn 2++ 2e –

Option (c) is the correct answer.

Explanation:

A reduction half reaction is a reaction in which there is gain of electrons.

For example, is a reduction half reaction.

Whereas a reaction in which there is release or removal of electrons is known as an oxidation half reaction.

For example, is an oxidation half reaction.

Therefore, we can conclude that out of the given options 2H ++ 2e –→ H2 is a reduction half-reaction.

c- cold periods in earth's history during which glaciers covered much of the surface.

explanation: