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NTA Abhyas NEET2020Chemistryp Block Elements (Group 15, 16, 17 & 18)Practice

Sodium thiosulphate, N a 2 S 2 O 3 . 5 H 2 O is used in photography to:

Options

  1. Areduce the silver bromide grains to metallic silver
  2. Bconvert the metallic silver to silver salt
  3. Cremove undecomposed AgBr as soluble silver thiosulphate complex
  4. Dremove reduced silver

Correct answer

C. remove undecomposed AgBr as soluble silver thiosulphate complex

Step-by-step solution

Na 2 S 2 O 3 + AgBr unexposed → Na 3 Ag ( S 2 O 3 ) 2 + NaBr The property is used for fixing in photography.

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