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Primary Cells

Which of the ...

Question

Which of the following is/are true about dry cell?

Cathoce is zinc.

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Anode is an inert graphite rod.

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Electrolyte is moist paste of ammonium chloride and zinc chloride.

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Starch is added to the paste make it thick so that it cannot be leaked out.

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Solution

The correct options are
C Electrolyte is moist paste of ammonium chloride and zinc chloride.
D Starch is added to the paste make it thick so that it cannot be leaked out.
Anode is zinc. Cathode is an inert graphite rod in the center of the cell immersed in an electrolyte paste. Electrolyte is moist paste of ammonium chloride and zinc chloride. Starch is added to the paste make it thick so that it cannot be leaked out.

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Following are some of the facts about dry cell

i) It is also called Leclanche cell

ii) It is also called Daniel cell

iii) Electrolyte is a moist paste of NH $_{4}$ Cl and ZnCl $_{2}$ in starch

iv) Cathodic reaction is

MnO $_{2}$ (s) + NH $_{4}^{+}$ + e $^{-} \to$ MnO(OH)+NH $_{3}$

Select correct facts :

Balance the following reaction:

1.when ammonium hydroxide is added to a solvent of iron (II) Sulphate , a green ppt of iron (II) hydroxide and ammonium sulphate is formed.

2.Zinc reacts with dilute hydrochloric acid to form zinc chloride and hydrogen gas liberated.

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