Explanation

(b) Just for your knowledge remember, voltaic cell uses dil. $H_{2}SO_{4}\ ;$ Dry cell uses $NH_{4}Cl + ZnCl_{2}$ paste; Daniel cell uses dil. $H_{2}SO_{4}\ ;$ Lead Accumulator uses dil. $H_{2}SO_{4}$ and $Ni$-$Fe$ cell or Alkaline Accumulator uses $KOH$ solution