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

Z n^{2 +}

ions are oxidized to zinc.

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M n O_{2}

reduces

H_{2}

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Zinc reacts with ammonia

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The dry cell is used as source of power in flashlights,portable radios, tape recorders, clocks etc.

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Solution

The correct options are
C Zinc reacts with ammonia
D The dry cell is used as source of power in flashlights,portable radios, tape recorders, clocks etc.
The following are true about dry cell.
Zinc is oxidized to $Z n^{2 +}$ ions.
At cathode, $M n O_{2}$ oxidises $H_{2}$ to $H_{2} O$ .
$H_{2} (g) + 2 M n O_{2} (s) \to M n_{2} O_{3} (s) + H_{2} O (l)$
Zinc reacts with ammonia to form a soluble compound containing complex ion $[Z n (N H_{3})_{4}]^{2 +}$
$Z n^{2 +} (a q) + 4 N H_{3} (a q) \to [Z n (N H_{3})_{4}]^{2 +} (a q)$
The dry cell is used as source of power in flashlights,portable radios, tape recorders, clocks etc.

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N H_{4} C l

Consider the following reaction which of the following statement is true for this cell reaction.

(Zn + Cu²⁺ → Zn²⁺ + Cu)

N H_{4} C l

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

Z n C l_{2}

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

8 g M n O_{2}

4 \times 10^{- 3}

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