(p) Primary Battery

(b)

(q) Fuel Cell

(c)

(r) Charging of secondary battery

(d)

(s) Discharging of secondary battery.

\n\nChoose the correct option.","answerCount":1,"educationalLevel":"NEET / NCERT","acceptedAnswer":{"@type":"Answer","text":"The correct option is (D\nE): Option (D\nE). Explanation: Correct Answer is:* a→ q, b→ r, c→ p, d→ s\n\nIn option A, ethane gas is undergoing collection which products electricity his is fuel cell.\n\nIn option B, It is a secondary battery i.e. lead storage battery.\n\nIn option C, It is mercury cell which is also a primary battery.\n\nIn option D, It is a nicke..."}}}