15mL of aqueous solution of Fe ^ 2 + in acidic medium completely reacted with 20mL of 0 . 03M aqueous Cr _ 2 O _ 7 ^ 2 - . The molarity of the Fe ^ 2 + solution is _______ × 10 ^ - 2 M (Round off to the Nearest Integer).

Correct answer: 0 n _ eq Fe ^ 2 + = n _ eq Cr _ 2 O _ 7 ^ 2 - or ( 15 × M Fe ^ 2 + 1000 ) × 1 = ((20 × 0 . 03)/(1000)) × 6 ∴ M Fe ^ 2 + = 0 . 24M = 24 × 10 ^ - 2 M

JEE Main 202117 MarchMorning Shift

Exam: JEE Main
Year: 2021
Date: 17 March
Shift: Morning Shift
Subject: Chemistry
Chapter: Redox Reactions

JEE Main 2021 · 17 March · Morning Shift · Chemistry · Redox Reactions

15mL of aqueous solution of Fe ^ 2 + in acidic medium completely...

15mL

of aqueous solution of

{Fe}^{2 +}

in acidic medium completely reacted with

20mL

0 . 03M

aqueous

{Cr}_{2}{{O}_{7}}^{2 -} .

The molarity of the

{Fe}^{2 +}

solution is _______

\times {10}^{- 2}M

(Round off to the Nearest Integer).

Correct answer

Step-by-step solution

${n}_{eq}{Fe}^{2 +} = {n}_{eq}{Cr}_{2}{O}_{7}^{2 -}$
or \left(\dfrac{15 \times M{Fe}^{2 +}}{1000}\right) \times 1 = \left(\dfrac{20 \times 0 . 03}{1000}\right) \times 6 $</p><p>$ ∴ M{Fe}^{2 +} = 0 . 24M = 24 \times {10}^{- 2}M

Practice Redox Reactions on Quantrex Academy →

More from Redox Reactions

500 mL of 0.2 M MnO _4^- solution in basic medium when mixed with 500 mL of 1.5 M KI… JEE Main 2026 Given below are two statements: Statement I: Sodium dichromate and potassium dichromate… JEE Main 2026 In order to oxidise a mixture of 1 mole each of FeC_2O_4 , Fe_2(C_2O_4)_3 , FeSO_4 and… JEE Main 2026 500 mL of 1.2 M KI solution is mixed with 500 mL of 0.2 M KMnO_ 4 solution in basic… JEE Main 2026 One mole of Cl_ 2 (~g) was passed into 2 L of cold 2 M KOH solution. After the reaction… JEE Main 2026 X and Y are the number of electrons involved, respectively during the oxidation of I^… JEE Main 2026 200 cc of x × 10^ -3 M potassium dichromate is required to oxidise 750 cc of 0.6 M Mohr's… JEE Main 2026 Identify the correct statements : A. Hydrated salts can be used as primary standard. B.… JEE Main 2026 Full Redox Reactions list All JEE Main PYQs