The chemical used as a fixer/developer in photography is

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Q: 24 (NDA-I/2015)
The chemical used as a fixer/developer in photography is
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question_subject: 

Science

question_exam: 

NDA-I

stats: 

0,25,18,8,6,25,4

keywords: 

{'sodium sulphite': [0, 0, 0, 1], 'sodium sulphate': [0, 1, 1, 0], 'sodium sulphide': [0, 0, 0, 1], 'chemical': [0, 0, 0, 1], 'sodium thiosulphate': [0, 1, 1, 2], 'photography': [0, 1, 1, 3], 'fixer': [0, 1, 0, 1], 'developer': [0, 0, 0, 1]}