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Oxidation – Reduction 9
Test Description: Chemistry
Instructions: Answer all questions to get your test result.
1) Oxidation is a process that involves:
A
All of the choices.
B
Loss of electrons.
C
An increase in the oxidation number.
D
Release of electrons.
2) Reduction is a process that involves
A
An increase in the oxidation number.
B
All of the choices.
C
Release of electrons.
D
Gain of electrons.
3) When it rusts, Iron (Fe) is:
A
oxidized.
B
reduced.
C
gains electrons.
D
evaporates
4) The oxidation number of chlorine in sodium hypochlorite (NaClO) of Clorox is:
A
+1
B
-1
C
None of the choices
D
0
5) The oxidation number of nitrogen in hydrazine (N2H4) is:
A
-2
B
+2
C
-1
D
+1
6) The electrolysis of water into oxygen and hydrogen gases is:
A
None of the choices
B
an oxidation – reduction reaction.
C
an oxidation reaction.
D
a reduction half reaction.
7) Acid – Base reaction is:
A
not redox.
B
reduction
C
redox.
D
oxidation.
8) When hydrogen combines with oxygen to form water, hydrogen:
A
All of the choices.
B
is oxidized.
C
loses electrons.
D
is the reducing agent.
9) In the formation of table salt: 2Na(s) + Cl2(g) ------ Heat+ 2NaCl(s)
A
(Cl2)is the oxidant.
B
No oxidant in this reaction
C
(Na) is the oxidant.
D
Both (Cl2)and (Na) are the oxidant.
10) When aluminum reacts with hydrochloric acid. 2Al(S) + 6HCl(aq) --------- 2AlCl3 + 3H2(g)
A
Both Hydrogen in (HCl) and (Al) are reduced.
B
Hydrogenin (HCl) isreduced, while (Al) is oxidized.
C
Hydrogen in (HCl) is oxidized, while (Al) is reduced.
D
Nothing oxidized or reduced in this reaction.
*select an answer for all questions
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