Chemical Process
Pick out the exothermic reaction out of the following:

C + H₂O = CO + H₂
All of these
CaC₂ + H₂O = Ca(OH)₂ + C₂H₂
MgCO₃ = MgO + CO₂

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Chemical Process
Presence of carbonaceous matter in the sewage

Causes reduction in its dissolved oxygen content thereby endangering the life of aquatic creatures
Increases the quantity of chlorine used for its purification
Reduces sulphate ions to sulphides causing obnoxious smell
All of these

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