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Chemistry

Chemistry
Which among the following is used to dilute oxygen in the gas cylinders used by divers ?

Argon
Krypton
Helium
Neon

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Chemistry
Which one is not a primary greenhouse gases in the Earth's atmosphere

Carbon dioxide
Ozone
Nitrogen
Methane

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Chemistry
Which of the following is not a derivative of barbituric acid

Amytal
Veronal
Nembutal
Equanil

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Chemistry
Which one of the following statements is not correct? Vulcanisation of rubber makes it

Soft and flexible
Strong and hard
Chemical resistant
Withstand higher temperatures

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Chemistry
The process of removing calcium and magnesium from hard water is known as

Sedimentation
Filtration
Flocculation
Water softening

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Chemistry
Candle is a mixture of

Bees wax and paraffin wax
Bees wax and stearic acid
Paraffin was and stearic acid
Higher fatty acids and stearic acid

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