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Silver halides are used in photography b...

Silver halides are used in photography because they are

A

Photosensitive

B

Soluble in hyposolution

C

Soluble in `NH_4OH`

D

Insoluble in acids

Text Solution

Verified by Experts

The correct Answer is:
a
Silver halides are used in photography because they are photosensitive in nature and on exposure to light, they are easily reduced to etallic silver by mild reducing agents like hydroquinone, ferrous oxalate etc.
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Photography is based on the nature of silver halides. Except AgF, the silver halides are photosensitive. These undergo decomposition in light and turn black due to formation of free silver. 2AgBroverset(light)to2Ag+Br_2 The photography films are prepared by adding 20% aqueous solution of AgNO_3 to NH_4Br solution containing gelatic. When such a film is exposed, emulsion gets affected and a latent image is formed on the film. When this exposed film or plate is dipped ina developer which contains a reducing agent, the part affected most during exposure are reduced to the maximum. The image becomes visible. It is called a negative. The remaining sensitive emulsion on the negative is removed by dissolving it in hypo solution (fixer). Fihnally, a positive of the nagative already prepared is made on silver bromide paper. Q. Silver halides are used in photographgy because these compounds

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