Question

The black color on the expand photographic movie contain:
A. $A{g_2}O$
B. $Ag$
C. $AgBr$
D. $N{a_3}Ag{\left( {{S_2}{O_3}} \right)_2}$

Answer 1

In black-and-white photographic movies, there may be typically one layer of silver halide crystals. When the exposed silver halide grains are advanced, the silver halide crystals are transformed to steel silver, which blocks mild looks because the black a part of the movie poor.

Complete answer: Even though most silver halides involve silver atoms with oxidation states of +1, silver halides in which the silver atoms have oxidation states of +2 are found, of which silver (II) fluoride is the most effective recognized strong one.A silver halide (or silver salt) is one of the chemicals that may form among the element silver and one of the halogens. Particularly, bromine, chlorine, iodine and fluorine may additionally each combine with silver to provide silver bromide (AgBr), silver chloride (AgCl), silver iodide (AgI), and 3 styles of silver fluoride, respectively.As a group, they're frequently referred to as the silver halides, and are often given the pseudo-chemical notation AgX. Although maximum silver halides contain silver atoms with oxidation states of +1, silver halides wherein the silver atoms have oxidation states of +2 are recognized, of which silver(II) fluoride is the most effective acknowledged stable one.Silver halides are mild-touchy chemicals, and are usually used in photographic film and paper.

Therefore, option C is the appropriate solution.

Note: The melting point of AgF is $435^\circ C$ , of AgCl is $457^\circ C$ , of AgBr is $430^\circ C$ (decomposes upon heating to seven-hundred degree Celsius ), and of AgI is $555^\circ C$ (melts with decomposition). Crystal hydrates with the formula $AgF.x{H_2}O$ , in which x = 1, 2, or three, are known. AgF can not be saved in glass vessels since it assaults the glass.