The colourless coating on a photographic film contains a chemical substance which reacts upon exposure to light, causing the film to darken. Which of the following substances is present in the darkened parts of the film? A. Bromine

C. Silver

B. Carbon

D. Silver bromide

D. Silver bromide

Explanation:

Silver bromide (AgBr) is used in photographic films because silver bromide is light sensitive.

Silver bromide (AgBr) is a colorless coating on a photographic film that decomposes and converted to elemental silver when exposed to the light and causes the film to darken.

Hence, the correct answer is "D. Silver bromide".

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ca has a crystalline lattice with positive ions (since it is a metal, metals are positively charged) and electrons flow freely in its structure since the ca atoms have a large nuclear radius so the electrons are not tightly held, therefore the electrons can flow freely since they are not being highly attracted by the nucleus. moreover, one of the properties of metals are that they are conductors of electricity, thus proving ca is the element.