What are hard waters?
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What is the unit of ph?
Fresh form of water is obtained from?
Why does a pond of clear water appear less deep than it really is?
Why is sodium preserved in kerosene oil ?
Why are some wires covered with insulating materials ?
Which gas used for purifying, air in underground enterprises ?
How is food preserved ?
Why is alum added to purify water ?
Is diamond element ?
What is the reaction that occurs between iodine and sodium thiosulphate?
Difference between an Atom and an Ion ?
What is the role of mercuric sulphate?