How is hardness of water caused?
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Why is acetic acid added?
What is gas-filled lamp ?
Why do we hear thunder after seeing a flash of lightning ?
Can a molecule be divided ?
What is the role of stannous chloride?
Explain the Atom?
What is the unit of ph?
What is the composition of air ?
Why is heat more oppressive on a damp hot day ?
Which expands to the greatest, when heated : silids, liquids or gases ?
When carbon is made to burn in an atmosphere of oxygen, what is produced ?
What causes smoke to curl up into the air ?