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Chemistry

Chemistry
What is the atomic number of mercury

32
41
63
80

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Chemistry
In which of the following states maximum iron ore is found ?

Fe3O4
FeCO3
FeS2
Fe2O3

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Chemistry
The octane number of zero is assigned to

iso-octane
3-methyl octane
2-methyl octane
n-heptane

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Chemistry
Carborundum is another name of

Silicon oxide
Calcium carbide
Calcium oxide
Silicon carbide

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Chemistry
The hydronium ion is

H+
HO -
H3O+
H2+

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Chemistry
Which gas is used as fire extinguisher ?

Carbon monoxide
Carbon dioxide
Sulphur dioxide
Carbon suboxide

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MORE MCQ ON Chemistry

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