1.
Most commonly used
bleaching agent is .
Ans.
chlorine
2.
The chief constituent of
gobar gas is.
Ans.
methane
3.
………….is the hardest
mineral.
Ans.
Diamond
4.
What is laughing gas?
Ans.
Nitrous Oxide
5.
The element common to all
acids is…….
Ans.
Hydrogen
6.
Diamond is an allotropic
form of…….
Ans.
Carbon
7.
Which gas is commonly used
in balloons?
Ans.
Helium
8.
Oldest known element?
Ans.
Copper
9.
Which shape of carbon is
used in lead pencils?
Ans.
Graphite
10.
Artificial silk is called?
Ans.
rayon
11.
…………….is used in decoration
lighting.
Ans.
Neon gas
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