Which of the following chemical reaction(s) is/are involved in the developing of photographic plate?

C_{6} H_{4} (O H)_{2} + 2 A g B r \to 2 A g + C_{6} H_{4} O_{2} + 2 H B r

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A g B r + 2 N a_{2} S_{2} O_{3} \to N a_{3} [A g (S_{2} O_{3})_{2}] + N a B r

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A g B r + 2 N H_{3} (a q) \to [A g (N H_{3})_{2}] B r

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2 A g B r + N a_{2} S_{2} O_{3} \to A g_{2} S_{2} O_{3} + 2 N a B r

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Solution

The correct options are
A $C_{6} H_{4} (O H)_{2} + 2 A g B r \to 2 A g + C_{6} H_{4} O_{2} + 2 H B r$
B $A g B r + 2 N a_{2} S_{2} O_{3} \to N a_{3} [A g (S_{2} O_{3})_{2}] + N a B r$
Developing of photographic plate requires two steps:
1) Making negative/positive of the photographic film. The reaction is:
$C_{6} H_{4} (O H)_{2} + 2 A g B r \to 2 A g + C_{6} H_{4} O_{2} + 2 H B r$

2) Fixing of the photographic film by removing unreduced AgBr as soluble complex.The reaction is:
$A g B r + 2 N a_{2} S_{2} O_{3} \to N a_{3} [A g (S_{2} O_{3})_{2}] + N a B r$

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