निम्नलिखित में से कौन सी ग� – McqOptions

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1.	निम्नलिखित में से कौन सी गैस हमारे पर्यावरण में बहुत अधिक मात्रा में मौजूद है?
A.	O2
B.	CO2
C.	H2
D.	N2
Answer» B. CO2

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