What is the purest form of water ?
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Why cooling is produced when a wet ?khus khus? screen is hung on the doors and windows ?
Explain acid gas?
Importance of Organic Chemistry to Mankind ?
Explain the Properties of Gases ?
A balloon constructed in Calcutta during July-August was found to show cracks at most wooden joints when received at Ferozepore in December. What is the probable cause ?
What is Bases ?
Why do eye-glasses become fogged, when the wearer comes form the cold outdoors into a warm room ?
When we pour into a tumble, bubbles ate seen outside why?
What is OOS $ OOT ?
When a glass rod is heated gradually and suddenly dipped in cold water, it cracks. What is the reason????????? When a cool glass rod is suudenly heatd, it cracks. Why?????????
What is iron ore consists of?
Why does a pond of clear water appear less deep than it really is?