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Chemistry

Chemistry
What is the mass percentage of oxygen in carbon dioxide (CO2)

0.658
0.305
0.509
0.727

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Chemistry
Non-stick kitchenwares are coated with

Silicon
Teflon
PVC
Graphite

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Chemistry
Saline soil contains

Lot of moisture
High concentration of salt
None of these
Hard rocks

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Chemistry
Which of the following is a secondary pollutant ?

PAN
NO
CO
SO2

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Chemistry
Major portion of the earth’s crust is mainly constituted by

Silicon and Aluminium
Silicon and Iron
Oxygen and Iron
Oxygen and Silicon

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Chemistry
Which is a natural colloid ?

Blood
Urea
Cane-sugar
Sodium chloride

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