21.
Coal tar contains about
A
300 substance
B
400 substance
C
200 substance
D
100 substance
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Coal tar contains about
300 substance
400 substance
200 substance
100 substance
Coal tar is used in manufacture of
Drugs
All of these
Explosives
Synthetic dyes
Coal tar has an unpleasant smell
None of these
Pleasant
Both (a) & (b)
Unpleasant
Coal is produced in industry to get
Coal tar
Coal gas
All of these
Coke