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Chemistry

Chemistry
Pyrethrin used in mosquito coil is obtained from

An insect
A bacterium
A fungus
A seed plant

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Chemistry
'Plaster of Paris' is made by partial dehydration of

Blue vitriol
Green vitriol
Gypsum salt
Epsom salt

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Chemistry
The main chemical constituent of the oil of cardamom which is responsible for flavour of this oil is

cineole
engenol
limonene
geraniol

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Chemistry
Vulcanized rubber contains sulphur

10-15%
3-5%
0.02
7-9%

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Chemistry
Gunpowder consits of a mixture of

Nitre, sulphur and charcoal
Sand and TNT
TNT and charcoal
Sulphur, sand and charcoal

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Chemistry
The half life period of an isotope is 2 hours. After 6 hours what fraction of the initial quantity of the isotope will be left behind?

1/8
1/3
1/6
1/4

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