Which of the following is correct about Bio gas 1 Bio gas contains large amounts of methane 2 It is ...........

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Which of the following is correct about Bio-gas?

1.Bio-gas contains large amounts of methane.

2.It is a renewable source of energy.

3.Bio-gas normally burns without smoke and has a high heating capacity.

Select the correct answer using the codes below.

1 only

1 and 3 only

2 and 3 only

1 , 2 and 3

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Explanation:

Bio-gas contains up to 75% methane.
It burns without smoke, leaves no residue like ash in wood, charcoal and coal burning. Its heating capacity is high. Bio-gas is also used for lighting.
The large-scale utilisation of bio-waste and sewage material provides a safe and efficient method of waste- disposal besides supplying energy and manure