Photography, Silver-Ag, d-Block Elements Assignment Help

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Photography:

The photographic plate is covered with a colloidal gelatinised solution of AgBr. When, the exposure, AgBr is decreased to the metallic silver.

This is described in the following equation:

                2295_photography.png

The exposed film is developed. The developer employed is an alkaline solution of hydroquinone or quinol that reduces a number of the exposed AgBr to black silver.

Equation:

    1506_photography1.png

The film is finally fixed by dipping in a solution of sodium thiosulphate or hypo that eliminates not changed AgBr like complex ion.

    527_photography2.png

Later than taking the print of photograph at last it is toned by dipping in a dilute solution of gold chloride to impart a beautiful golden colour or it is dipped in potassium chloro platinate K2PtCl6 solution to obtain a shining grey tinge.

Equation for this is as shown below:

    130_photography3.png

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