Which gas used for purifying, air in underground enterprises ?
Why ate shadows longer at the end of the day ?
What is the difference between gas and vapour?
when we covert any substance into vapour state from solid state, is it ionized or not?
Why is ammonia solution added while preparing edta solution?
What is the formula you will use to calculate how many millilitres of 5.5 m naoh are required to prepare 400 ml of 1.5m naoh?
What is titration?
What s the difference between hard and soft coal ?
Why is it dangerous to have a coal fire burning with doors and windows closed ?
What are the products formed after cod analysis?
Explain the Physical change?
Though the secondary cell can be recharged again and again, still they have a lifetime. Why?
Explain the Mixture?