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Standard XII

Chemistry

Electrochemical Cells, Galvanic Cells

Following are...

Question

Following are some of the facts about a dry cell
I : It is also called Leclanche cell
II : It is also called Daniel cell
III : Electrolyte is a moist paste of 4 $N H_{4} C l$ and 2 $Z n C l_{2}$ in starch
IV : Cathodic reaction is
$2 M n O_{2} (s) + 2 N H_{4}^{+} (a q) + 2 e^{-} \to M n_{2} O_{3} (s) + 2 N H_{3} (g) + H_{2} O (l)$
Select the correct facts.

I, II, III

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I, IV

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I, III, IV

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II, III, IV

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Solution

The correct option is C I, III, IV
Daniel cell consists of two half cells. In one half-cell copper is dipped in the $C u S O_{4}$ solution whereas, in second half-cell, the zinc solution is dipped in the $Z n S O_{4}$ solution. Both of these half cells are joined by a salt bridge.
In a dry cell, the anode is zinc whereas the cathode is graphite.
Thus, Daniel cell is an example of a voltaic cell. Thus it is not a dry cell.
Lechlanche cell is a dry cell which consists of a zinc anode and mixture of carbon and manganese dioxide in a pot. It is a primary cell.
In a dry cell, the reduction occurs within the moist paste of $N H_{4} C l$ and $Z n C l_{2}$ .
The cell reaction of the dry cell can be given as follow:
Reduction: $2 M n O_{2} (s) + 2 N H_{4}^{+} (a q) + 2 e^{-} \to M n_{2} O_{3} (s) + 2 N H_{3} (g) + H_{2} O (l)$
Oxidation: $Z n (s) \to Z n^{2 +} (s) + 2 e^{-}$
Thus, $I, I I I, a n d I V$ are right facts.

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Similar questions

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 :

Q. 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

M n O_{2}, c a r b o n, N H_{4} C l

and

Z n C l_{2}

in aqueous base.
The cathodic reaction may be represented as:

2 M n O_{2} (s) + Z n^{2 +} + 2 e^{-} \to Z n M n_{2} O_{4} (s)

Let there be

8 g M n O_{2}

in the cathodic compartment. How many days will the dry cell continue to give a current of

4 \times 10^{- 3}

ampere?

Which of the following statements are correct about heartwood?

(i) It does not help in water conduction.
(ii) It is also called alburnum.
(iii) It is light in colour and is very soft.
(iv) It has tracheary elements which are filled with tannins, resins, etc.

Q. Which of the given statements for mercury cell are incorrect?
(i) Mercury cell is suitable for low current devices like hearing aids, watches, etc.
(ii) It consists of zinc-mercury amalgam as anode and a paste of HgO and carbon as the cathode.
(iii) The electrolyte is a paste of

Z n (O H)_{2}

and

K O_{2}

.
(iv) The electrode reactions for the cell are
At anode:

Z n (H g) + H_{2} O \to Z n O_{(s)} + 2 O H^{-} + 2 e^{-}

At cathode:

H g O + H_{2} O + 2 e^{-} \to H g_{(l)} + 2 O H^{-}

What can be inferred from the following equation?

$N a_{2} S O_{4} (a q) + B a C l_{2} (a q) \to B a S O_{4} (s) + 2 N a C l (a q)$

(i) It is a displacement reaction.

(ii) It is a precipitation reaction.

(iii) It is a double decomposition reaction.

(iv) $B a S O_{4}$ is soluble in water

(v) $B a S O_{4}$ is a precipitate.

(vi) NaCl dissolves in water.

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Following are some of the facts about a dry cellI : It is also called Leclanche cellII : It is also called Daniel cellIII : Electrolyte is a moist paste of 4 NH4Cl and 2 ZnCl2 in starchIV : Cathodic reaction is2MnO2(s)+2NH+4(aq)+2e−→Mn2O3(s)+2NH3(g)+H2O(l)Select the correct facts.