Indicate in each reaction which one is oxidised or reduced if any- 2NaBr - Cl2 - 2NaCl - Br2In the above reaction- which one of the following is oxidised-

The correct option is A NaBr The oxidation number of bromine changes from 1 (in nbsp; NaBr) to 0 (in Br_2 ). Thus, NaBr is oxidized.The oxidation ...

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Variable Oxidation States

Indicate in e...

Question

Indicate in each reaction which one is oxidised or reduced if any:

$2 N a B r + C l_{2} \to 2 N a C l + B r_{2}$

In the above reaction, which one of the following is oxidised?

N a B r

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B r_{2}

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C l_{2}

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None of these

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Solution

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3 N_{2} H_{4} + 2 {B r O}_{3}^{-} \to 3 N_{2} + 2 B r^{-} + 6 H_{2} O

H_{2} S O_{3} + 2 H_{2} S ⟶ 3 S + 3 H_{2} O

C l_{2} + 2 N a B r \to B r_{2} + 2 N a C l

2 N a + O_{2} \to N a_{2} O

2 K + 2 H_{2} O \to H_{2} + 2 K O H

Δ H^{o}

2 N a B r + C l_{2} = 2 N a C l + {B r}_{2}

Δ H^{o}

Δ H^{o} (N a B r) = - 361 K J / m o l

Δ H^{o} (N a C l) = - 411 K J / m o l

3 B r_{2} + 6 C O_{3}^{2 -} + 3 H_{2} O \to 5 B r^{⊖} + B r O_{3}^{⊖} + 6 H C O_{3}^{⊖}

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