Bijaya Mam
24/03/20, 10:15 PM
All Media
Read the following passage carefully.
Coal tar is black and sticky. For a long time, people
thought of it as a nuisance. This oily, smelling
substance blocked up the pipes, so gas makers and
coke makers washed it out and tried to get rid of it.
Some of it was sold for roofing but most of it was
wasted. But this evil smelling nuisance has been
found to be one of the most useful of raw materials
in the world. From it the chemist is able to make
almost anything he wishes --- from medicines to
explosives, from dyes to disinfectants. Not all these
things are made from coal tar itself. Only about a
dozen simple products come from it. But from these
the chemist is able to make thousands of new
substances. Some of the most important things
made from coal tar are dyes.
A whole rainbow of colours is made from coal-tar.
More than nine hundred different coal tar dyes are in
common use. These dyes not only give fine colours
to our clothes, ribbons, shoes and hats, but also give
pleasing colours to many of our sweets and drinks.
Some of the coal tar dyes, serve another purpose
besides that of giving colour, they are used to heal
wounds. Many important medicines are made from
coal tar. Carbolic acid is one such. Another is used by
a dentist when he pulls out a tooth. It deadens the
nerves in the gum so that no pain is felt.
Answers
Bijaya Mam
24/03/20, 10:15 PM
All Media
Read the following passage carefully.
Coal tar is black and sticky. For a long time, people
thought of it as a nuisance. This oily, smelling
substance blocked up the pipes, so gas makers and
coke makers washed it out and tried to get rid of it.
Some of it was sold for roofing but most of it was
wasted. But this evil smelling nuisance has been
found to be one of the most useful of raw materials
in the world. From it the chemist is able to make
almost anything he wishes --- from medicines to
explosives, from dyes to disinfectants. Not all these
things are made from coal tar itself. Only about a
dozen simple products come from it. But from these
the chemist is able to make thousands of new
substances. Some of the most important things
made from coal tar are dyes.
A whole rainbow of colours is made from coal-tar.
More than nine hundred different coal tar dyes are in
common use. These dyes not only give fine colours
to our clothes, ribbons, shoes and hats, but also give
pleasing colours to many of our sweets and drinks.
Some of the coal tar dyes, serve another purpose
besides that of giving colour, they are used to heal
wounds. Many important medicines are made from
coal tar. Carbolic acid is one such. Another is used by
a dentist when he pulls out a tooth. It deadens the
nerves in the gum so that no pain is felt.
Answer:
what we have to done in the question.