Which of the following are modern day fuels which do not leave any residue on burning?

LPG

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CNG

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Coal

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Petroleum

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Solution

The correct options are
A
LPG

B
CNG

LPG and CNG are modern day fuels with the least amount of harmful emissions. This is because the carbon content in these fuels is minimum and hence do not leave any residue upon burning. This is particularly true when designed to be used in good supply of air or oxygen.

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