23. metal corrosion is a reaction during which a metal becomes oxidized. which of the statements below are true about this kind of reaction? check all that apply.
a) if oxygen is involved, it supplies electrons to the metal.
b) the oxidation state of the metal increases (its oxidation number becomes more positive).
c) the oxidation process involves loss of electrons by the metal.
d) there must be direct contact between the metal and oxidizer for electron transfer to take place.
e) another atom must be reduced as the metal is oxidized.

All the options beside A are correct.

Explanation:

Oxidation reaction is defined as the reaction in which an atom looses its electrons. Here, oxidation state of the atom increases.

Reduction reaction is defined as the reaction in which an atom gains electrons. Here, the oxidation state of the atom decreases.

So, when metal gets oxidized by the other substance , there is direct contact of metal and oxidizer.

During corrosion of metal ,there is a loss of electrons from the metal atom which increases its oxidation state and other oxidizer itself get reduced.

the answer to this question is 3.

a gas, having a molecular weight of 13 kg/kmol and a kinematic viscosity of 0.25 cm2/s, flows through a pipe 0.25 m internal diameter and 5 km long at the rate of 0.4 m3/s and is delivered at atmospheric pressure.