Sulphur reacts with conentrated alkali to give a product which is used for photography fixing and development. Name the product and show the reaction.

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Solution

Sodium thiosulphate $(N a_{2} S_{2} O_{3})$ is the product that is formed when sulphur reacts with concentrated alkali. Sodium thiosulphate forms a complex with silver halide on photographic paper. Therefore, it is used as a fixer in photography. It is formed by the following reaction:
$6 N a O H + 4 S \to N a_{2} S_{2} O_{3} + 2 N a_{2} S + 3 H_{2} O$

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