Chemical Process
White phosphorous is stored under water, because

Its kindling temperature in dry air is very low
It does not react with water
It is unstable
It is poisonous

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Chemical Process
Mineral oils (e.g. petroleum oils) are preferred over fatty oils (e.g. mustard oil, ghee, tallow, palm oil, olive oil etc.) as a lubricant due to its

All of these
Hydrolysis tendency in presence of water
Greater tendency of decomposition at elevated temperature
Poor oxidation stability and high gum forming tendency

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Chemical Process
Presence of carbonaceous matter in the sewage

Reduces sulphate ions to sulphides causing obnoxious smell
Causes reduction in its dissolved oxygen content thereby endangering the life of aquatic creatures
All of these
Increases the quantity of chlorine used for its purification

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