railway RRB NTPC Mock Test Series 2024-25 (CBT 1 + CBT 2) General Science Chemistry Chemical Reaction

जब कॉपर को सांद्र H2SO4 के साथ गर्म किया जाता है तो क्या मुक्त होता है?

1
O2
2
SO2
3
SO3
4
H2S
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