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QJEEM21Ch64aa: JEE Main 2021 Chemistry - Class 11 JEEM21Ch64aa Solution: When 10 mL of an aqueous solution of KMnO 4 was titrated in…

When 10 mL of an aqueous solution of KMnO4 was titrated in acidic medium, equal volume of 0.1 M of an aqueous solution of ferrous sulphate was required for complete discharge of colour. The strength of KMnO4 in grams per litre is __________ × 10−2. (Nearest integer)

[Atomic mass of K = 39, Mn = 55, O = 16]

Step-by-Step Verified Solution

Let molarity of KMnO4 = x

JEE Main 2021 (Online) 27th August Morning Shift Chemistry - Practical Organic Chemistry Question 46 English Explanation
(Equivalents of KMnO4 reacted) = (Equivalents of FeSO4 reacted)

⇒ (5 × x × 10 ml) = 1 × 0.1 × 10 ml

⇒ x = 0.02 M

Molar mass of KMnO4 = 158 gm/mol

⇒ Strength = (x × 158) = 3.16 g/l

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