Fill in the blanks with most appropriate option.
Bio-gas is an excellent fuel as it contains up to 75% (i) lt burns without smoke, leaves no residue like ash in wood. lts heating capacity is (ii) . The slurry left behind is removed periodically and used as excellent manure, rich in (iii) and (iv)
| (i) |
(ii) |
(iii) |
(iv) |
| (A) Methane |
High |
Nitrogen |
Phosphorous |
| (B) Nitrogen |
Low |
Methane |
Phosphorous |
| (C) Methane |
Low |
Nitrogen |
Oxygen |
| (D) Oxygen |
High |
Nitrogen |
phosphorous |
