Which of the following is used in photography?
Correct answer: B. Na2S2O3
- A. NaHSO3
- B. Na2S2O3
- C. Na2S
- D. Na2SO3
Explanation
Sodium thiosulfate, Na2S2O3, is used as photographic fixer because it dissolves unexposed silver halide by forming a soluble silver-thiosulfate complex. The likely distractor is Na2SO3, a sulfite salt with a similar formula, but sulfite does not perform the standard fixing reaction.
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Redox reactions involve oxidation and reduction occurring together, with electrons transferred between species or oxidation numbers changing. The topic covers assigning oxidation states, identifying oxidizing and reducing agents, balancing redox equations by oxidation number or half-reaction methods, and connecting chemical changes with galvanic and electrolytic cells.
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