Which gas is used, in laboratories etc. for burners ?
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Why is a vessel of water heats more quickly, when heat is applied at the bottom than it is heated at the top?
Why do eye-glasses become fogged, when the wearer comes form the cold outdoors into a warm room ?
Explain the Valency?
Is diamond element ?
Explain the how to make Alloys?
What is the purest form of water ?
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Mention a few application of cod test in environmental engineering practice.
Why does the filament of an electric lamp glow, when current passes through it ?
How is arsenic produced?
What is viscosity-coefficient of a liquid?
How do you express the total hardness of water?
Why is sodium preserved in kerosene oil ?