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Q.

Which of the following was used in making roads?

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a

Coal gas

b

Lubricating oils

c

Coal Tar

d

Parrafin wax

answer is D.

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Detailed Solution

'Coal Tar 'was used in making cost-effective roads. Now, it is not used in road making due to less durability and carcinogenic effect. Bitumen replaced coal-tar due to its high durability and stability.

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