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| Q. |
The chemical name of "Hypo" commonly used in photography is – |
| A. | Sodium thiosulphate |
| B. | Silver nitrate |
| C. | Sodium nitrate |
| D. | Silver iodide |
| Answer» A. Sodium thiosulphate | |
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Explanation: An emulsion of sodium thiosulfate is called hypo by photographers. It is used to stop development of exposed film. Thiosulfate converts undeveloped silver bromide grains in the film into water-soluble silver thiosulfate complexes that can be removed when the film is washed. |
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