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

• A
  $(i)$ and $(iv)$
• B
  $(i)$ and $(iii)$
• C
  $(ii)$ and $(iii)$
• D
  $(i)$ only