Question

When TEL (Tetra Ethyl Lead) is added to petrol, then:

• A. it increases the B.P. of petrol
• B. it increases the anti-knocking rating
• C. it decreases the B.P. of petrol
• D. it decreased the anti-knocking rating

Hint:

TEL was used historically to improve the performance of petrol engines, but it is now largely replaced due to environmental concerns.

Answer 1

The Correct Option is B

Tetra Ethyl Lead (TEL) is an additive used in petrol to increase the anti-knocking rating. This means that TEL helps prevent engine knocking, thereby improving engine performance. TEL does not significantly affect the boiling point (B.P.) of petrol.
Thus, the correct answer is (B) it increases the anti-knocking rating.