Oxidation – Reduction 9 Question Preview (ID: 50964)


Chemistry. TEACHERS: click here for quick copy question ID numbers.

When aluminum reacts with hydrochloric acid. 2Al(S) + 6HCl(aq) --------- 2AlCl3 + 3H2(g)
a) Hydrogenin (HCl) isreduced, while (Al) is oxidized.
b) Hydrogen in (HCl) is oxidized, while (Al) is reduced.
c) Nothing oxidized or reduced in this reaction.
d) Both Hydrogen in (HCl) and (Al) are reduced.

In the formation of table salt: 2Na(s) + Cl2(g) ------ Heat+ 2NaCl(s)
a) (Na) is the oxidant.
b) (Cl2)is the oxidant.
c) Both (Cl2)and (Na) are the oxidant.
d) No oxidant in this reaction

When hydrogen combines with oxygen to form water, hydrogen:
a) is oxidized.
b) loses electrons.
c) is the reducing agent.
d) All of the choices.

Acid – Base reaction is:
a) not redox.
b) redox.
c) oxidation.
d) reduction

The electrolysis of water into oxygen and hydrogen gases is:
a) an oxidation reaction.
b) a reduction half reaction.
c) an oxidation – reduction reaction.
d) None of the choices

The oxidation number of nitrogen in hydrazine (N2H4) is:
a) -1
b) -2
c) +1
d) +2

When it rusts, Iron (Fe) is:
a) reduced.
b) oxidized.
c) gains electrons.
d) evaporates

The oxidation number of chlorine in sodium hypochlorite (NaClO) of Clorox is:
a) 0
b) -1
c) +1
d) None of the choices

Oxidation is a process that involves:
a) Loss of electrons.
b) An increase in the oxidation number.
c) Release of electrons.
d) All of the choices.

Reduction is a process that involves
a) Gain of electrons.
b) An increase in the oxidation number.
c) Release of electrons.
d) All of the choices.

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