The percent transmittance of 8 × 10⁻⁵ M solution of KMnO₄ is 39. when measured at 510 nm in a cell of path… · ABC26PH0477

Subject: Physical Chemistry · Chapter: Photochemistry · Topic: Photochemistry – General · Exam: GATE 2005-2021 · Marks: 2 · Difficulty: Medium

The percent transmittance of $8 \times 10^{-5} \mathrm{M}$ solution of $\mathrm{KMnO}_{4}$ is 39 . when measured at 510 nm in a cell of path length of 1cm. The absorbance and the molar extinction coefficient (in $\mathrm{M}^{-1} \mathrm{cm}^{-1}$ ) of this solution are, respectively
(a)0.30 and 4500
(b)0.35 and 4800
(c)0.4 and 5000
(d)0.48 and 5200
Answer
Answer: C ✓ checked by 4AB · confidence high
Explanation
A = −log 0.39 ≈ 0.41 ≈ 0.4; ε = 0.4/(8×10⁻⁵ × 1) = 5000 M⁻¹ cm⁻¹ (c).

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