Correct Answer: (C) agbr > agcl > agi πππ₯πππ¨π ππ«π£πππ‘ππ§ππ’π‘ π’π πππππ§ π₯ππππ§ππ’π‘ β€ What is light sensitivity? - Light sensitivity means how fast a substance breaks when light shines on it. - Faster breaking = higher sensitivity. β€ What happens in the reaction? - Light supplies energy. - The compound breaks into silver and halogen gas. Example: agbr β ag + brβ (in light) β€ Now, the real thinking test - The question is: which one breaks fastest when light hits it? β€ Why most students choose (A) or (B) - They think: βiodine is bigger β so agi should react fastestβ - This looks logical, but it is a wrong assumption. > Bigger atom does NOT always mean faster reaction. β€ What actually matters - How easily electrons can move when light hits the compound - Not just size of the atom β€ The correct scientific behaviour - agbr β releases electrons very easily β reacts fastest - agcl β reacts, but slower - agi β holds electrons strongly β reacts slowest β€ Strong proof you cannot ignore - Cameras use agbr (silver bromide) - Because it reacts quickly to light and forms images fast Now think carefully: > If agi was truly the most sensitive, why is it not used in photography? That question exposes why (A) and (B) are wrong. β€ Final correct order - agbr β most sensitive - agcl β moderate - agi β least sensitive > agbr > agcl > agi β€ Why (A) is wrong - It wrongly puts agi as the fastest β€ Why (B) is wrong - It wrongly places agbr as the slowest β€ Simple Tip - βBr = Best with lightβ β agbr is number one TAP β€οΈ & SHARE IF THIS WAS HELPFUL
This physics problem tests your understanding of fundamental physical laws and their applications. The step-by-step solution below breaks down the problem using relevant equations and physical reasoning.
ScanSolve AI Answer
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Correct.
Your explanation accurately describes the light sensitivity of silver halides. The order of sensitivity is determined by how easily the halide ion can release an electron when exposed to light, leading to the formation of silver metal.
AgBr is the most sensitive because the bromide ion is larger than chloride, making its valence electrons less tightly held and easier to release upon light absorption. This is why it's widely used in photography.
AgCl is less sensitive than AgBr because the chloride ion is smaller, holding its electrons more strongly.
AgI is the least sensitive. Although iodide is the largest, its strong covalent character with silver makes it less prone to releasing electrons compared to AgBr under typical photographic light conditions.
Therefore, the correct order of light sensitivity is $\text{AgBr} > \text{AgCl} > \text{AgI}$.
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