निम्नलिखित में से कौन - सी ग – McqOptions

MCQOPTIONS

1.	निम्नलिखित में से कौन - सी गैस वायु को प्रदूषित नहीं करती है ?
A.	O₂
B.	CO
C.	CO₂
D.	SO₂
Answer» B. CO

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