How is temporary hardness be removed?
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Why is it dangerous to have a coal fire burning with doors and windows closed ?
Why do we hear thunder after seeing a flash of lightning ?
Why is the indicator eriochrome black(ebt) shows wine red color at the beginning and blue color at the end?
which metal is found abundantly in the earths crust??
Which gas is used in hospitals for the artificial respiration ?
What are the factors that affect the viscosity of a liquid?
Which gas used for purifying, air in underground enterprises ?
Why is Davy Lamp called a Safety Lamp ?
which gas is called laughing gas?
What is Oxidation and Reduction?
What is meant by transmittance?
Difference between Physical and Chemical change ?