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Chemistry mcq questions and answers for competitive exams

Ramya_naidu

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Chemistry mcq questions and answers for competitive exams UPSC SSC , SSC CGL, SSC CHSL, upsc Civils , Entrance exams Online test practice online free Quiz, mock practice online
1.
Alloys made with mercury as one metal are called?

a
solders
b
mixtures
c
amalgams
d
emulsions
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2.
The number of electrons presents in H+ is

a
0
b
1
c
2
d
3
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3.
The hardest form of carbon is

a
coke
b
graphite
c
charcoal
d
diamond
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4.
pH of water is

a
5
b
6
c
7
d
8
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5.
Natural rubber is a polymer derived from?

a
isoprene
b
ethylene
c
propylene
d
butadiene
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6.
The octane number of zero is assigned to

a
n-heptane
b
iso-octane
c
2-methyl octane
d
3-methyl octane
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7.
=The National Chemical Laboratory is situated in

a
Pune
b
Patna
c
New Delhi
d
Bangalore
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8.
The isotope atoms differ in?

a
atomic weight
b
atomic number
c
number of electrons
d
number of neutrons
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9.
What is metallurgy?

a
process of making metals live long
b
process of creating alloys of metals
c
process of extracting metal in pure form from its ore
d
None of above
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10.
Elements that show the properties of both metals and non metals are called?

a
alloys
b
colloids
c
allotropes
d
metalloids
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11.
The most commonly used bleaching agent is

a
alcohol
b
chlorine
c
carbon dioxide
d
sodium chlorine
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12.
What is the hardest form of carbon?

a
coke
b
graphite
c
charcoal
d
diamond
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13.
Conduction band electrons have more mobility than holes because they are

a
have negative charge
b
need less energy to move them
c
experience collision less frequently
d
experience collision more frequently
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14.
Atomic number of an element gives

a
the number of nucleons in its atom
b
the number of electrons in its atom
c
the weight of the atom of the element
d
the total number of elementary particles in its atom
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15.
Why is phosphorus kept under water?

a
to make it wet
b
to make it durable
c
water forms a protective coating on it
d
to save it from catching fire when exposed to dry air
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