Answered

6. Most automobile engines use either a mixture of ethylene glycol and water or propylene glycol and water as a coolant.

(a) Pure water has more heat-carrying ability than either ethylene glycol or propylene glycol. Give one reason why pure water should not be used as a coolant in automobile engines.

(b) Give a reason why it is not advisable to improvise the cooling effects of pure water with sodium chloride as a freezing mixture in an automobile engine.

17.

(a) What is an inert electrode?

(b) State the products formed when brine is electrolyzed using an inert electrode.
(i) Anode
(ii) Cathode



Answer :

GinnyAnswer

Final answer:

The answer explains why pure water should not be used as a coolant and the products from brine electrolysis using inert electrodes.


Explanation:

Reasons for not using pure water as a coolant in automobile engines:

  1. Pure water freezes at 0°C which can lead to engine damage due to expansion upon freezing.
  2. Pure water has a lower boiling point, causing it to vaporize at lower temperatures compared to water mixed with glycol, leading to overheating in the engine.

Products formed from brine electrolysis using inert electrodes:

  • (i) Anode: Chlorine gas
  • (ii) Cathode: Hydrogen gas

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