Chemical Process
Hydrazine is largely used

As a starting material for 'hypo'
In photographic industry
As rocket fuel
In printing industry

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Chemical Process
Use of hydrated lime in water treatment

After filtration, combats the corrosive-ness of water due to the presence of O₂ & CO₂
All of these
Before filtration, reduces the bacterial load on filters
Is to adjust the pH value

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