{"id":12855,"date":"2026-06-23T12:10:14","date_gmt":"2026-06-23T12:10:14","guid":{"rendered":"https:\/\/www.vedprep.com\/exams\/?p=12855"},"modified":"2026-06-23T12:24:07","modified_gmt":"2026-06-23T12:24:07","slug":"spectrophotometry-for-iit-jam","status":"publish","type":"post","link":"https:\/\/www.vedprep.com\/exams\/iit-jam\/spectrophotometry-for-iit-jam\/","title":{"rendered":"Spectrophotometry (UV-Vis): Master IIT JAM 2027"},"content":{"rendered":"

If you are gearing up for the IIT JAM, you already know that Physical Chemistry isn’t something you can just wing. Among the heavy hitters like thermodynamics and quantum mechanics, spectroscopy stands out as a high-scoring zone. Specifically, <\/span>Spectrophotometry (UV-Vis)<\/b> is a topic that regularly pops up in the exam, making it a must-know for anyone aiming for a top rank.<\/span><\/p>\n

Understanding Spectrophotometry (UV-Vis) For IIT JAM<\/b><\/h2>\n

This unit aligns directly with the official syllabus under “Spectroscopy and Structure.” While standard textbooks like <\/span>Atkins\u2019 Physical Chemistry<\/span><\/i> give you the full, rigorous mathematical breakdown, wrapping your head around the practical intuition is what helps you clear those tricky multiple-choice questions (MCQs) and numerical answer type (NAT) problems.<\/span><\/p>\n

At <\/span>VedPrep<\/b><\/a>, we look at this topic not just as a bunch of equations to memorize, but as a practical tool that makes total sense once you break down how light and molecules interact. Let\u2019s dive into how it actually works.<\/span><\/p>\n

Worked Example: Spectrophotometry (UV-Vis) For IIT JAM<\/b><\/h2>\n

Let’s look at the example problem provided in the original text, but let’s break down how to approach Spectrophotometry<\/strong> systematically so you don’t trip up during the actual exam.<\/span><\/p>\n

Problem:<\/b> A solution of 1 M FeSO\u2084 is diluted to 0.1 M. The absorbance at 430 nm is measured to be 0.5. The molar absorptivity (\u03b5) of FeSO\u2084 at 430 nm is given as 1000 M\u207b\u00b9 cm\u207b\u00b9. The path length of the cuvette used is 1 cm. What is the concentration of FeSO\u2084?<\/span><\/p>\n

The Setup:<\/b><\/p>\n

The Beer-Lambert law is written as:<\/span><\/p>\n

\"Beer-Lambert<\/p>\n

Where:<\/span><\/p>\n