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Leaded petrol used to be the primary source of air-borne lead emission. This problem has been overcome by

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a

Using unleaded petrol

b

Using ethanol-mixed petrol

c

Using TEL leaded petrol

d

Using MTBE loaded petrol

answer is A.

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Detailed Solution

(a) In India, lead free petrol is being used in automobiles. Thus, emission of lead is prevented(b) Ethanol – mixed petrol is CO free but not lead – free(c) TEL (Tetraethyl lead) prevents knocking but not lead(d) MTBE (Methyl Tertiary Butyl Ether) prevents knocking but not lead

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