railway RRB Group D Mock Test Series 2024-25 General Science

ନିମ୍ନଲିଖିତ ରାସାୟନିକ ପଦାର୍ଥ ମଧ୍ୟରୁ କେଉଁଟି ବାୟୁମଣ୍ଡଳରେ ଓଜୋନ ସ୍ତରକୁ ହ୍ରାସ କରିବା ପାଇଁ ଜଣାଶୁଣା ଅଟେ?

1
NO2
2
SO2
3
CO
4
CFCs
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