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Chemistry 9 Chapter 7 - Electro Chemistry - 2
1.
The number of charges an atom will have in a molecule or a compound is known as?
a) Atomic mass
b) Isotope
c) Oxidation number
d) Atomic number
2.
The elements that show an increase in oxidation number are?
a) Oxidized
b) Reduced
c) Condensed
d) None
3.
The elements that show a decrease in oxidation number are?
a) None
b) Oxidized
c) Reduced
d) Condensed
4.
Which one of the following represents oxidation?
a) Gain of electrons
b) Loss of hydrogen
c) Loss of oxygen
d) Gain of hydrogen
5.
Which one of the following represents reduction?
a) Gain of electrons
b) Gain of oxygen
c) Loss of hydrogen
d) Loss of electrons
6.
Which one of the following represents oxidation?
a) Decrease in oxidation number
b) Increase in oxidation number
c) None of these
d) Both of these
7.
The oxidation state of any uncombined or free element is always?
a) Zero
b) One
c) Three
d) Two
8.
The oxidation state of S in S
8
is?
a) 1
b) -1
c) 0
d) 2
9.
Which one of the following has zero oxidation number?
a) Na
b) H in H
2
c) All of these
d) Zn
10.
Oxidation state of Na in Na
+2
is?
a) 1
b) -2
c) 3
d) +2
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