Question

reduction - oxidation or redox reactions involve the transfer of energy through electrons. determine if the following reactions are reduction reactions. if they are, mark them as true. if they are not, mark them as false.

a. nad⁺ + e⁻+ h⁺⇌nadh
b. fe⁺²⇌fe⁺³
c. pyruvate + 2e⁻⇌lactate
d. no₂⁻⇌no₃⁻

Explanation:

Step1: Recall reduction reaction concept

Reduction is gain of electrons.

Step2: Analyze reaction a

In $NAD^+ + e^-+H^+\to NADH$, $NAD^+$ gains an electron, so it is a reduction reaction (True).

Step3: Analyze reaction b

In $Fe^{+2}\to Fe^{+3}$, $Fe$ loses an electron (oxidation), not a reduction reaction (False).

Step4: Analyze reaction c

In Pyruvate $+ 2e^-\to$ lactate, pyruvate gains electrons, so it is a reduction reaction (True).

Step5: Analyze reaction d

In $NO_2^-\to NO_3^-$, nitrogen loses electrons (oxidation), not a reduction reaction (False).

Answer:

a. True
b. False
c. True
d. False