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

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]}

The chemical used as a fixer/developer in photography is sodium thiosulphate, which is option 3.

Although sodium sulphate (option 1) is a chemical compound that is commonly used in various industries, including as a detergent, it is not the correct chemical used in photography.

Sodium sulphide (option 2) is a different compound that is used in various applications, such as in the leather industry, but it is not used as a fixer/developer in photography.

Sodium sulphite (option 4) is another compound that is used as a preservative and a reducing agent in certain processes, but it is not the chemical used in photography.

Sodium thiosulphate, also known as hypo, is the chemical that is used as a fixer/developer in photography. It is used to remove unexposed silver halide crystals from photographic film or paper, thereby fixing the image.