A reaction occurs as a result of the combination of reactants and products.
What is the reaction?
We have to learn that a reaction occurs as a result of the combination of reactants and products. We know that the products formed may often be quite different from the reactants that were combined to produce them.
Having said so, let us look at the equations one after the other;
Mg + 2HCl ------> MgCl2 + H2. There is the evolution of a colorless and odorless gas that gives a pop sound with glowing splint.
CuCl2 + HCl ----> There is no observation
2NaHCO3 + H2SO4 --> Na2SO4 + 2H2O + 2CO2 - There is evolution of a gas that turns lime water milky
CuO + H2SO4 → CuSO4 + H2O - The solution turns blue and there is no effect both on lime water and glowing splint.
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