The metal whose salts are sensitive to light is   - Study24x7
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Nisha Tanwar
08 Aug 2019 11:55 AM study24x7 study24x7

The metal whose salts are sensitive to light is  

A

Silver 

B

 Zinc 

C

 Copper 

D

Gold

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    • A photochemical reaction can be divided into three categories as follows: 1. Reactions in which quantum yield is small integers such as 1, 2 or 3. For example, dissociation reactions of hydrogen iodide and hydrogen bromide. 2. Reactions in which quantum yield is less than 1. For example, dissociation reactions of ammonia and nitrogen dioxide. 3. Reactions in which the quantum yield is extremely high. For example, combination reactions of hydrogen and chlorine, etc. One of the important examples of photochemical reactions are the reactions involving the salts of silver metal, specifically silver halides which are light sensitive and thus, undergo a photographic process. When these halides are exposed to light, a chemical reaction occurs which darkens the film to produce an image. Hence, these compounds are generally used in making photographic films. For example, silver chloride crystals consist of tightly packed ions which are denoted by Ag+ and Cl−. When a film containing silver chloride crystals is exposed to light, the extra electrons of chlorine ions get excited and ejected which are captured by silver ions to get converted into silver metal. The reactions are as follows: Ejection of electron from the chlorine: Ag++Cl−+light energy→Ag++Cl+e− Electron capture by silver: Ag++e−→Ag(metal) When silver metal is formed as a product in the chemical reaction, the entire crystal is converted into metallic silver and results in formation of a dark image on the film. Therefore, the metal whose salts are sensitive to light is silver.

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