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When was oxygen fist discovered?
A: 1772
B: 1775
C: 1773
D: 1776
Sulphuric acid was discovered by
A: Jabir bin hayyan
B: Al razi
C: Al beruni
D: Berzellius
How many branches in chemistry
A: 8
B: 9
C: 5
D: 10
Formula for water
A: H2o
B: Nacl
C: Hcl
D: all
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