Teaching TGTET Paper 1 & 2 Mock Test Series 2024-25 General Science Chemistry Chemistry in Everyday Life

বায়ুমন্ডলে কোন গ্যাসটি দ্বিতীয় সর্বাধিক প্রচুর গ্যাস?

1
O2
2
CO2
3
Ar
4
N2
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