Question

In which equation does the oxidation of the underlined compound occur? (PLEASE JUST ANSWER A,B,C OR D AND Correctly)

asked May 14, 2022 52.5k views

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Krackmoe · Answer 1 · 2022-05-14T18:25:56+0000

Answer:

This is an oxidation-reduction (redox) reaction:

2 CuII + 4 e- → 2 Cu0 (reduction)

C0 - 4 e- → CIV (oxidation)

CuO is an oxidizing agent, C is a reducing agent.

cuO – Copper(II) oxide source: wikipedia, accessed: 2019-09-27source: wikidata, accessed: 2019-09-02

Other names: Cupric oxide source: wikipedia, accessed: 2019-09-27source: wikidata, accessed: 2019-09-02, Copper monoxide source: wikidata, accessed: 2019-09-02, Copper oxide source: wikidata, accessed: 2019-09-02

Appearance: Black to brown powder

C

Names: Carbon black source: wikidata, accessed: 2019-09-02source: ICSC, accessed: 2019-09-04source: NIOSH NPG, accessed: 2019-09-02, Acetylene black source: wikidata, accessed: 2019-09-02source: ICSC, accessed: 2019-09-04source: NIOSH NPG, accessed: 2019-09-02, Channel black source: wikidata, accessed: 2019-09-02source: NIOSH NPG, accessed: 2019-09-02

Appearance: Odourless black pellets or extremely fine powder source: ICSC, accessed: 2019-09-04; Black, odorless solid. source: NIOSH NPG, accessed: 2019-09-02

Products:Cu

Names: Copper source: wikidata, accessed: 2019-09-07source: ICSC, accessed: 2019-09-04, Copper (dusts and mists, as Cu) source: NIOSH NPG, accessed: 2019-09-02, Cu source: wikidata, accessed: 2019-09-07

Appearance: Solid in various forms. turns green on exposure to moist air source: ICSC, accessed: 2019-09-04; Reddish, lustrous, malleable, odorless solid. source: NIOSH NPG, accessed: 2019-09-02

CO2

Names: Carbon dioxide source: wikipedia, accessed: 2019-09-27source: wikidata, accessed: 2019-09-02source: ICSC, accessed: 2019-09-04source: NIOSH NPG, accessed: 2019-09-02, {{plainlist| source: wikipedia, accessed: 2019-09-27, CO2 source: wikidata, accessed: 2019-09-02

Appearance: Colorless gas source: wikipedia, accessed: 2019-09-27; Odourless colourless compressed liquefied gas source: ICSC, accessed: 2019-09-04; Colorless, odorless gas. [Note: Shipped as a liquefied compressed gas. Solid form is utilized as dry ice.] source: NIOSH NPG, accessed: 2019-09-02

Vyacheslav Egorov · Answer 2 · 2022-05-20T02:28:58+0000

The correct answer is option C.
$($2Mg + O_2 \rightarrow 2MgO$)$

The oxidation of a compound involves the loss of electrons. In the given reactions, let's analyze each one to identify where the oxidation of the underlined compound occurs.

A.
$2Cu + C \rightarrow CO_2 + Cu$

- Copper
$($Cu$)$ is not undergoing oxidation; carbon
$($C$)$ is undergoing reduction by gaining oxygen from carbon dioxide
$($CO_2$).$

B.
$Fe_2O_3 + 3CO \rightarrow 2Fe + 3CO_2$

- Iron
$($Fe$)$ in
$Fe_2O_3$ is being reduced to iron
$($Fe$)$ , and carbon monoxide
$(CO\))$ is being oxidized to carbon dioxide
$($CO_2$)$ .

C.
$2Mg + O_2 \rightarrow 2MgO$

- Magnesium
$($Mg$)$ is oxidized as it loses electrons to oxygen
$($O_2$)$ , forming magnesium oxide
$($MgO$)$ .

D.
$MnO_2 + 4HCl \rightarrow MnCl_2 + 2H_2O + Cl_2$

- Manganese dioxide
$($MnO_2$)$ is being reduced to manganese chloride
$($MnCl_2$)$ , while hydrogen chloride
$($HCl$)$ is oxidized to chlorine gas
$($Cl_2$)$ .

Therefore, the oxidation of the underlined compound occurs in Equation C
$($2Mg + O_2 \rightarrow 2MgO$)$ where magnesium
$($Mg$)$ undergoes oxidation by reacting with oxygen
$($O_2$)$ to form magnesium oxide
$($MgO$)$ .

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