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Chemistry

Chemistry
Non-stick kitchenwares are coated with

Graphite
PVC
Silicon
Teflon

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Chemistry
The pollutant responsible for ozone holes is ________

CO2
CFC
CO
SO2

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Chemistry
An example of major air pollutant is

Helium
Oxygen
Carbon monoxide
Carbon dioxide

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Chemistry
The iron ore which contains 72% of iron is :

Limonite
Haematite
Siderite
Magnetite

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Chemistry
Total number of elements in the Periodic table

112
115
127
118

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Chemistry
The hydronium ion is

H2+
HO -
H+
H3O+

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