Teaching NVS Lab Attendant Mock Test 2024 General Science Chemistry Basic Concepts of Chemistry

Which of the following reaction is not correct according to the law of conservation of mass?

1
2Mg(s)+O2(g) → 2MgO (s)
2
C3H8(g)+O2 → CO2(g)+H2O
3
P4(s)+5O2(g) → P4O10(s)
4
CH4(g)+2O2(g) → CO2(g)+2H2O
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