To which one of the following reactions occurring at 25°c does the symbol δh°f[h2so4(l)] refer? a)2 h(g) + s(g) + 4 o(g) h2so4(l)b)h2(g) + s(g) + 2 o2(g) h2so4(l)c)h2so4(l)h2(g) + s(rhombic) + 2 o2(g)d)h2so4(l)2 h(g) + s(rhombic)+ 4 o(g)e)h2(g) + s(rhombic) + 2 o2(g)h2so4(l)

When copper is added to a solution of nitric acid, their chemical reaction produces heat.

Explanation:

During the reaction between copper an d nitric acid, the copper metal is oxidised to form copper(ii) ion, by nitrate ion. Then this is converted into notrogen oxide gas. As, a result of this conversion, there is a binding of copper(ii) ion with water molecules of number 6. As a result of this, the copper metal will turn into a solution which is blue and a gas of brown color is obtained.

Thus when copper is added to nitric aci, there is a change in the temperature. The chemical reaction that takes place between Copper and Nitric acid solution generates heat. This process is an exotermic.