MCQs on Decomposition Reaction CO2 obtained by the complete decomposition of 20 g CaCO3 at STP is (a) 4.48 l (b) 2.24 l (c) 44.8 l (d) 48.4 l Answer: (a) Decomposition of hydrogen peroxide to give H2O + O2 is an example of (a) reduction (b) oxidation (c) both …