Correct Answer - Option 3 : White to grey
Explanation:
Silver halides:
- A silver halide (also known as a silver salt) is a chemical compound formed when the element silver (Ag) reacts with one of the halogens.
- Bromine (Br), chlorine (Cl), iodine (I), and fluorine (F) can all mix with silver to produce silver bromide (AgBr), silver chloride (AgCl), silver iodide (AgI), and three different types of silver fluoride.
- They're known as the silver halides as a group, and they're typically denoted by AgX.
- Although the majority of silver halides contain silver atoms with oxidation states of +1 (Ag+), silver halides with oxidation states of +2 (Ag2+) are also known,
- Silver (II) fluoride is the only one that is stable where Ag is in a +2 oxidation state.
- Silver halides are Light-sensitive compounds.
- Silver chloride is turns grey from white when exposed to sunlight.
- They are widely employed in photographic film and paper.
- Silver halide crystals in gelatin are coated onto a film base, glass, or paper substrate in photographic film and photographic paper, including graphic art film and paper.
- As a protective colloid with adequate physical and chemical properties, gelatin is an essential component of the emulsion.
- Although modern practice employs gelatin without trace materials (such as sulphur), the gelatin may contain trace elements (such as sulphur) that boost the emulsion's light sensitivity.
Colour intensity of silver halides:
- Silver halides, except for silver fluoride, are extremely water-insoluble.
- The three most common silver halide compounds have different colours that can be used to identify halide ions in a solution fast.
- Silver chloride precipitates as a white substance.
- silver bromide is a creamy substance.
- Silver iodide is a yellow substance.
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AgI being yellow when it precipitates has greater colour intensity whereas AgCl being white appears to be dull and least colour intensive.
The correct order of silver halides on the basis of colour intensity is - AgCl < AgBr < Agl
