What is the composition of gun-powder ?
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When kerosene oil is burnt, lamp black is produced it is a
from of carbon.
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Why do we feel chilly in damp clothes ?
What are the uses of Alloy ?
What is the safety curtain in cinema or theatre made off ?
Which wavelengths are visible to human eye?
How is water purified on large scale, for drinking ?
What is the prime constituents of cement?
Which is the hottest part of a flame ?
Mention the different types of conductivities.
What is Acids, Bases salts ?
What is Distillation ?
Explain substituted hydrocarbon?
What is the reaction that occurring between fas and potassium dichromate?