LPG used as domestic fuel is mixed with a strong-smelling liquid for

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Better combustion

Good small/fragrance

Detection of gas leakage

Higher calorific value

answer is C.

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Detailed Solution

concept - LPG gas is essentially propane and butane and is odourless in its natural state. LPG is very dangerous because if it leaks, it can cause terrible fires and destructive explosions.
The smell you notice when there is a leak is actually an entirely different agent called Ethyl Mercaptan. This substance is added to the gas as it leaves the main storage terminals.
To prevent damage due to LPG leaks, Ethyl Mercaptan is added to the gas, which has a strong smell of rotten cabbage. This smell helps us detect whenever there is a leak, which actually makes a lot of sense in terms of safety and security.
Hence, LPG used as domestic fuel is mixed with a strong-smelling liquid for detection of gas leakage.
Thus, the correct option is (3).

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