What happens when a solution of an acid is mixed with a solution of a base in a test tube?
(i) The temperature of the solution increases
(ii) The temperature of the solution decreases
(iii) The temperature of the solution remains the same
(iv) Salt formation takes place
(i) only
(i) and (iii)
(ii) and (iii)
(i) and (iv)
Steps: Acid + Base → Salt + Water (neutralisation). Neutralisation reactions are usually exothermic so temperature increases. Therefore (i) and (iv) are true.