Primary and Secondary Batteries — Prelims Questions

Which of the following statements about a mercury cell is INCORRECT?

In a lead-acid battery, during discharge, which of the following processes occurs at the anode?

Which of the following batteries is known for its 'memory effect'?

Which of the following is an advantage of Lithium-ion batteries over Nickel-Cadmium batteries?

The overall reaction for the discharge of a dry cell (Leclanché cell) is given by: $Zn(s) + 2MnO_2(s) + 2NH_4^+(aq) \rightarrow Zn^{2+}(aq) + Mn_2O_3(s) + 2NH_3(g) + H_2O(l)$. What is the change in oxidation state of manganese in this reaction?

Which of the following applications primarily utilizes a primary battery due to its requirement for stable, long-term, low-drain power without the need for recharging?