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Following are some of the facts about a ...

Following are some of the facts about a dry cell
I : It is alos 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
`2MnO_(2)(s)+2NH_(4)^(+)(aq)+2e^(-)`
`rarrMn_(2)O_(3)(s)+2NH_(3)(g)+H_(2)O(l)`
Select correct facts :

A

`i, ii, iii`

B

`i, iii, iv`

C

`ii, iii, iv`

D

`i, iv`

Text Solution

Verified by Experts

The correct Answer is:
B
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In a zinc manganese dioxide dry cell, the anode is made up of zinc and cathode of a carbon rod surrounded by a mixture of MnO_(2) , carbon NH_(4)Cl and ZnCl_(2) in aqueous base. The cathodic reaction may be represented as: 2MnO_(2) (s) + Zn^(2+) + 2e^(-) rarr ZnMn_(2) O_(4) (s) Let there be 8g MnO_(2) in the cathodic compartment. How many days will the dry cell continue to give a current of 4 xx 10^(-3) ampere ?

In a zinc manganese dioxide dry cell, the anode is madeup of Zn1 and cathode of carbon rod surrounded by a mixture of MnO_(2) , carbon, NH_(4)Cl , and ZnCl_(2) in aqueous base. The cathodic reaction is : ZnMnO_(2)(s)+Zn^(2+)+2e^(-) rarr ZnMn_(2)O_(4)(s) 8.7g of MnO_(2) is taken in the cathodic compartment. How many days will the dry cell continue to give a current of 9.65xx10^(-3)A ? ( Atomic weight of Mn=55)(Mw of MnO_(2)=87g mol^(-1))

Complete the chemical equations : MnO_4^(-) (aq) + S_2O_3^(2-)(aq) + H_2O (l) to

Complete the following chemical equation: (i) MnO_(4)^(-)(aq)+s_(2)O_(3)^(2-)(aq)+H_(2)O(I) to (ii) MnO_(4)^(-) +NO_(2)^(-)+H^(+) to

Which molecule is polar in each of the following pairs ? (i) HF, F_(2)" (ii) "CO_(2), H_(2)O (iii) n_(2),NH_(3)" (iv) "CH_(4),CH_(3)Cl.

Select the correct statement about the following reactions. NH_(4) + NO_(2)^(-) to N_(2) + 2H_(2)O

Statement : Dry cells-Leclanche cells are corroded and lose their current producing nature after sometime and do not posses infinite life. Explanation : NH_(3) formed at cathode in dry cell as a result of reduction reacts with Zn container MnO_(2) +NH_(4)^(+) + e rarr MnO(OH) + NH_(3) to form Zn(NH_(3))_(4)^(2+)

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