What is the unit of ph?
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What is the difference between hard and soft water ?
What are the constituents of cements?
is urea addition affecting the COD (chemical oxygen demand) & BOD (Biological oxygen demand)level? why?
Why is ammonia added? Why is that same amount of ammonia added?
What is wave number?
What is gas-filled lamp ?
How is electricity generated from water ?
Arrange by acidic values : phenol, nitrotolouene and o-cresol?
Define what is oxidation and reduction reaction?
Explain the Modern Atomic Theory ?
what is the indicator used?
Why has every parachute a hole in the centre ?