What are hard waters?
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Difference between heavy hydrogen , Atom Hydrogen and Hydrogen Ion ?
Why is the percentage of oxygen today the same as it was thousands years ago, even though the whole world inhals it?
Explain the Matter?
Why is a newly made quit warmer than an old one ?
A dynamite catridge struck in a rock makes the rock burst in being fired. How dies it happen ?
What is Atomic number?
Why can?t the meat and dal( pulses ) be cooled well on the top of high mountains ?
Which gas is used, in laboratories etc. for burners ?
Why are the bright circles of light seem under the trees, when the sun shines?
why is their exotherm while addition of reducing agents in reduction reaction?
Why do woolen clothes keep us warm in winter ?
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How are ph and pka related?