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

निम्नलिखित में से कौन-सी अपचायी अभिक्रिया है ?

1
2 Mg (s) + O2 (g) → 2 MgO (s)
2
S (s) + O2 (g) → SO2 (g)
3
\(2HgO\left( s \right)\overset{heat}{\mathop{\to }}\,2Hg\left( l \right)+{{O}_{2}}\left( g \right)\)
4
Mg (s) + S (s) → MgS (s)
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