Consider the metals in the following reactions.

2 Mg + O2 → 2 MgO
CuO + H2 → Cu + H2O
Ag+ + Cl− → AgCl

Which of the following is true?

1. Magnesium is oxidized, copper is reduced,
and silver is neither oxidized nor reduced.

2. Magnesium is oxidized; copper and silver
are reduced.

3. Magnesium is reduced; copper and silver
are neither oxidized nor reduced.

4. Magnesium and silver are oxidized; copper
is reduced.
1. Magnesium is oxidized, copper is reduced,
and silver is neither oxidized nor reduced.

The answer to your question is  the first option

Explanation:

Reactions

                            2 Mg + O₂ → 2 MgO

                            CuO + H₂ → Cu + H₂O

                            Ag+ + Cl− → AgCl

Process

1.- Determine the oxidation number of the elements

                            2 Mg⁰ + O₂⁰ → 2 Mg⁺²O

⁻²

                            Cu⁺²O⁻² + H₂⁰ → Cu⁰ + H₂⁺¹O

⁻²

                            Ag+ + Cl− → Ag⁺¹Cl⁻¹

2.- Determine if the metals were oxidized or reduced

Magnesium changed from 0 to +2                     oxidized

Copper changed from +2 to 0                            reduced

Silver changed from +1 to +1                                it did not change.

answer: cellular respiration takes in food and uses it to create atp, a chemical which the cell uses for energy. usually, this process uses oxygen, and is called aerobic respiration. it has four stages known as glycolysis, link reaction, the krebs cycle, and the electron transport chain.