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Hey MATE!
1) Electrolysis of water is an endothermic process as heat is absorbed in the process.
2) Burning of natural gas is exothermic as heat is released during the process.
3) Decomposition of CaCO3 into CaO and CO2 is endothermic and heat is absorbed in the process so that CaCO3 gets decomposed.
4) Since burning of magnesium produces heat therefore the process is exothermic in nature.
Hope it helps
HAKUNA MATATA :))
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