The principal gas evolved from sludge digestion tank is$? – McqOptions

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1.	The principal gas evolved from sludge digestion tank is$?
A.	CO
B.	CO‚Äö√á√á
C.	CH‚Äö√á√ë
D.	N‚Äö√á√á
Answer» D. N‚Äö√á√á

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