Why the temperature of the mixture of HCl rises when aluminium is added to it.

Q. When a solution of $500mL$ of $2M$ $KOH$ is added to $500mL$ of $2M$ $HCl$, then the rise temperature $T_1$ is noted. When the same experiment is repeated by mixing $250mL$ of each solution, the rise in temperature $T_2$ is noted :

Q. A solution of 200 mL of 1 M KOH is added to 200 mL of 1 M HCl and the mixture after attaining reaction equilibrium shows a rise in temperature by $△T_1.$ The experiment is repeated by using 50 mL of 1 M KOH and 50 mL 1 M HCl which at equilibrium shows a rise in temperature by $△T_2.$ Thus:

Q. A solution of $500ml$ of $2MKOH$ is added to $500ml$ of $2MHCl$ and the mixture is well shaken. A rise in temperature, $T_1$ is noted. The experiment is again performed using $250ml$ of $KOH$ solution and $250ml$ of $HCl$ solution and rise in temperature $T_2$ is again noted. Which of the following is correct?

Q. A solution is 500 mL of 2 M $KOH$ is added to 500 mL of 2 M $HCl$ and the mixture is well shaken. The rise in temperature $T_1$ is noted. The experiment is then repeated using 250 mL of each solution and rise in temperature $T_2$ is again noted. Assume all heat is taken by the solution.