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Chemistry

Chemistry
The gas that usually causes explosions in coal mines is

Carbon monoxide
Air
Hydrogen
Methane

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Chemistry
The acid rain destroys vegetations because it contains

Sulphuric acid
Ozone
Carbon monoxide
Nitric acid

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Chemistry
When water itself combines chemically with some element or mineral it is called

Desilication
Carbonation
Hydration
Oxidation

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Chemistry
The green colour seen in firework displays is due to the chloride salt of :

Calcium
Sodium
Barium
Strontium

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Chemistry
The high reactivity of fluorine is due to

strong F - F bond
availability of d-orbitals
small size of fluorine atom
its high electro negativity

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Chemistry
________ is used for making vinegar.

Oxalic acid
Malic acid
Tartaric acid
Acetic acid

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