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Chemistry

Chemistry
Which of the following metals has least melting point ?

Mercury
Silver
Copper
Gold

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Chemistry
When iron rusts, its weight

Remains the same
Increases
Decreases
First increases and then decreases

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Chemistry
The monomer of polythene is

vinyl chloride
ethylene
ethyl alcohol
None of these

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

0.323
0.273
0.201
0.158

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Chemistry
The charcoal used to decolourise brown sugar solution is

Coconut charcoal
Animal charcoal
Wood charcoal
Sugar charcoal

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Chemistry
Limestone is a raw material used by which industry?

Petrochemicals
Cement
Aluminium
Fertilizers

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