Which of the following material is not present in a P dry cell? W ...

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Which of the following material is not present in a
P dry cell?

W
(1) \( \mathrm{MnO}_{2} \)
(2) \( \mathrm{NH}_{4} \mathrm{Cl} \)
(3) \( \mathrm{ZnCl}_{2} \)
(4) \( \mathrm{KCl} \)
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