(i) A galvanic cell converts chemical energy into electrical energy. (ii) In electrolytic conduction the conductance increases with increase in temperature. iii) When the surface area of the electrodes is increased in a galvanic cell, the emf also increases.
- a Only i and ii are correct
- b Only ii and iii are correct
- c Only i and iii are correct
- d All are correct
- e All are wrong
Dear Student,
(i) is correct as galvanic cell converts chemical energy to electrical energy. (ii) is also correct as with the increase of temperature, kinetic energy of the ions increases and so they move fast, thereby increasing the conductance of the solution. (iii) is incorrect because greater the surface are if electrode,lesser will be the resistance of the solution. Resistance is directly proportional to emf, therefore, emf will also decrease.
Hence, correct answer is (a)
(i) is correct as galvanic cell converts chemical energy to electrical energy. (ii) is also correct as with the increase of temperature, kinetic energy of the ions increases and so they move fast, thereby increasing the conductance of the solution. (iii) is incorrect because greater the surface are if electrode,lesser will be the resistance of the solution. Resistance is directly proportional to emf, therefore, emf will also decrease.
Hence, correct answer is (a)