Two chemical reactions are shown:

2mg + o2 → 2mgo
caco3 → cao + co2

which statement is true?

(a) cao is a reactant from second reaction
(b) oxygent act as oksidator in the first reaction
(c) magnesium undergoes reduction reaction
(d) calsium carbonate act as product of the reaction

B

Oxygen acts as oxidator in the first reaction.

Explanation:

At reactant side:

Mg = 0

At product side:

MgO = 0

but Oxygen (O) = -2

Mg + O = 0

Mg + (-2) = 0

Mg - 2 = 0

Mg = 2

Magnesium is oxidized by OXYGEN from zero to +2

Oxygen acts as oxidator in the first reaction.

Oxygen acts as oxidator in the first reaction.

Explanation:

while cooking a piece of 1/2 pound beef steak, a cast iron pan (2.4kg in weight) was heated 260 celsius.