Photochromic sunglasses, which darken when exposed to light, contain a small amount of colorless AgCl embedded in the glass. When irradiated with light, metallic silver atoms are produced, and the gla

Question

Photochromic sunglasses, which darken when exposed to light, contain a small amount of colorless AgCl embedded in the glass. When irradiated with light, metallic silver atoms are produced, and the glass darkens.

$A g Cl \to A g + Cl$

Escape of the chlorine atoms is prevented by the rigid structure of the glass, and the reaction therefore reverses as soon as the light is removed. If $482.5 k J / m o l$ of energy is required to make the reaction proceed, what minimum wavelength of light is necessary.

(Use: $1 e V = 96.5 k J / m o l$ )

TestHub · Accepted Answer

E = 482.5 kJ / mol = 5 eV . ∴ λ = 5 1240 ​ . 248 nm

Chemistry - Atomic Structure Question with Solution | TestHub

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JEE Main 2028 (Class 11)