Which of the following is are the characteristics of compress natural Gas CNG 1 ...........

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Which of the following is/are the characteristics of compress natural Gas (CNG)?

1. It is lead free

2. it is liquid fuel like LPG

3. On combustions it emits lesser carbon Monoxide than petrol

4. the noise level of CNG engine is higher than That of diesel

Select the correct answer using the code given below

1and 2

1and3

2,3and 4 only

1,3 and 4 only

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Explanation:

CNG-compressed natural gas .it is a mixture of hydrocarbons consisting of approximately 80 to 90 % methane in gaseous form.
    CNG is lead free and reduces harmfull emissions
    It is not a liquid fuel and is not same as LPG.
    Compared to petrol or diesel CNG vehicles emit 40% less of nitrous oxide 80% less of carbon mono oxide and 25% less of carbon dioxide.
    Noise level of a CNG engine is much lower than that of a diesel engine.