general science
#1
The hardest substance available on earth is
diamond
#2
Washing soda is the common name for
sodium carbonate
#3
The gas usually filled in the electric bulb is
nitrogen
#4
Chemical formula for water is.
h2o
#5
Graphite most use in?
pencils
#6
Brass gets discoloured in air because of the presence of which of the following gases in air?
Hydrogen sulphide
#7
which of the following is a non metal that remains liquid at room temperature?
bromine
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Q: When does a normal conductor become a superconductor?A: At critical temperature
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