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Chemistry

Chemistry
Which of the following gases is mixed with oxygen for breathing by divers in aqua lungs?

Nitrogen
Hydrogen
Methane
Helium

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Chemistry
Which of the following partial miscible liquid pairs has both lower and upper critical solution temperature

Glycerine and m-toluene
Water and Phenol
Aniline and n-hexane
Water and diethyl aniline

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Chemistry
Catalyst is a substance which

Has no action on the rate of the reaction
None of these
Increases the rate of the reaction
Decreases the rate of reaction

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Chemistry
Basicity of boric acid, H3BO3 is

3
4
5
2

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Chemistry
Piped Natural Gas (PNG) is used for

Cooking
Mining
Welding
Anaesthesia

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Chemistry
The alkaloid naturally found in coffee, cocoa and cola nut is

Tannin
Cocaine
Morphine
Caffeine

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