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Q.

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 NH4Cl and ZnCl2 in starch
iv) Cathodic reaction is MnO2(s)+NH4(aq)++eMnO(OH)+NH3 Select correct facts

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a

i, ii, iii

b

ii, iii, iv

c

i, iii, iv

d

i, iv

answer is B.

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Detailed Solution

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Daniel cell is a primary cell which cannot supply steady current for a long time. It consists of a copper vessel containing a strong solution of copper sulphate. A zinc rod is dipped in dilute sulphuric acid contained in a porous pot. The porous pot is placed inside the copper sulphate solution.

A Leclanche cell consists of a carbon electrode packed in a porous pot containing manganese dioxide and charcoal powder. The porous pot is immersed in a saturated solution of ammonium chloride (electrolyte) contained in an outer glass vessel. A zinc rod is immersed in electrolytic solution.

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