Removal of carbon particles from air involves the principle of
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Which of the following elements has the lowest melting point?
The Chemical formula of Ammonium dichromate is _____.
'Norwesters' are thunder storms which are prominent in _____.
If a body slides over a surface, the force resisting the motion between them is called ______.
Which rays cause skin damage?
What is the capital of Canada?
Barometer was invented by