Teaching BPSC बिहार माध्यमिक TGT (9 to 10) शिक्षक भर्ती 4.0 Mock Test General Science Biology Biology in Everyday life
Biogas is an excellent fuel as it contains up to 75% ________.
1
sulphide
2
hydrogen
3
methane
4
More than one of the above
5
None of the above