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Chemistry

Chemistry
Which of the following is ozone depleting pesticide ?

Methyl bromide
Ethylene ozonide
Benzene
D.T.

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Chemistry
The method that cannot be used for removing permanent hardness of water is

adding caustic soda
adding sodium carbonate
boiling
distillation

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Chemistry
Two moles of an ideal gas expand freely into vacuum. The work done by the gas is

Infinity
4J
2J

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Chemistry
Neoprene is a polymer of

Isobutane
Isoprene
Chloroprene
Isopentane

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Chemistry
Which amidst the following is not a gem stone ?

Opal
Topaz
Pearl
Cat's-eye

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Chemistry
The nuclear particle having no mass and no charge, but only spin is

Proton
Meson
Electron
Neutrino

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