JEE Mains · Chemistry · STD 12 - 2. Electrochemistry
Consider the following redox reaction : \(\mathrm{MnO}_4^{-}+\mathrm{H}^{+}+\mathrm{H}_2 \mathrm{C}_2 \mathrm{O}_4 \rightleftharpoons \mathrm{Mn}^{2+}+\mathrm{H}_2 \mathrm{O}+\mathrm{CO}_2\) The standard reduction potentials are given as below \(\left(\mathrm{E}_{\mathrm{red}}^{\circ}\right)\) \(\mathrm{E}_{\mathrm{MmO}_4^{-} / \mathrm{Mm}^{2+}}^{\circ}=+1.51 \mathrm{~V}\) \(\mathrm{E}_{\mathrm{CO}_2 / \mathrm{H}_2 \mathrm{C}_2 \mathrm{O}_4}^{\circ}=-0.49 \mathrm{~V}\) If the equilibrium constant of the above reaction is given as \(K_{\text {eq }}=10^x\), then the value of \(x=\)_______. (nearest integer)
- A \(339\)
- B \(350\)
- C \(390\)
- D \(340\)
Answer & Solution
Correct Answer
(A) \(339\)
Step-by-step Solution
Detailed explanation
Cell \(\mathrm{Rx}^{\mathrm{n}} ; \mathrm{MnO}_4^{-}+\mathrm{H}_2 \mathrm{C}_2 \mathrm{O}_4 \rightarrow \mathrm{Mn}^{2+}+\mathrm{CO}_2\)…
See the Complete Solution
Get step-by-step explanations for this and 2.5 Lakh+ more JEE, NEET & CET questions.
- Unlock all solutions
- Practice the full chapter
- Track accuracy across PYQs
4.8 rated on Google Play · 14,000+ reviews
More questions from Chemistry
- The complete combustion of \(0.492\, g\) of an organic compound containing \('C', 'H'\) and \('O'\) gives \(0.793\, g\) of \(CO _{2}\) and \(0.442\,g\) of \(H _{2} O\). The percentage of oxygen composition in the organic compound is .... (nearest integer)JEE Mains 2022 Medium
- In Friedel-Crafts alkylation of aniline, one gets ....JEE Mains 2022 Medium
- On heating a mixture of common salt and \(K_{2}Cr_{2}O_{7}\) with concentrated \(H_{2}SO_{4}\), a gas is evolved. Formula of the gas evolved and oxidation state of the central metal atom in the gas respectively are:JEE Mains 2026 Easy
- Given below are two statements : Statement \(I\): Aniline reacts with con. \(\mathrm{H}_2 \mathrm{SO}_4\) followed by heating at \(453-473 \mathrm{~K}\) gives \(\mathrm{p}\) aminobenzene sulphonic acid, which gives blood red colour in the 'Lassaigne's test'. Statement \(II\): In Friedel - Craft's alkylation and acylation reactions, aniline forms salt with the \(\mathrm{AlCl}_3\) catalyst. Due to this, nitrogen of aniline aquires a positive charge and acts as deactivating group. In the light of the above statements, choose the correct answer from the options given below :JEE Mains 2024 Hard
- Product \(C\) of the following reaction sequence will be
JEE Mains 2026 Hard - \(19.5\) g of fluoro acetic acid (molar mass \(= 78\) g mol\(^{-1}\)) is dissolved in \(500\) g of water at \(298\) K. The depression in the freezing point of water was \(1°\)C. What is \(K_a\) of fluoro acetic acid? (For water, \(K_f = 1.86\) K kg mol\(^{-1}\)). Assume molarity and molality to have same values.JEE Mains 2026 Medium
More PYQs from JEE Mains
- \(\lim _{n \rightarrow \infty} \frac{3}{n}\left\{4+\left(2+\frac{1}{n}\right)^2+\left(2+\frac{2}{n}\right)^2+\ldots+\left(3-\frac{1}{n}\right)^2\right\}\) is equal toJEE Mains 2023 Hard
- The value of \(\cot \left( {\sum\limits_{n = 1}^{19} {{{\cot }^{ - 1}}\left( {1 + \sum\limits_{p = 1}^n {2p} } \right)} } \right)\) isJEE Mains 2019 Hard
- Let \(\mathrm{a}_{1}, \mathrm{a}_{2}, \mathrm{a}_{3}, \ldots\) be an \(A.P.\) If \(\frac{a_{1}+a_{2}+\ldots+a_{10}}{a_{1}+a_{2}+\ldots+a_{p}}=\frac{100}{p^{2}}, p \neq 10\), then \(\frac{a_{11}}{a_{10}}\) is equal to :JEE Mains 2021 Hard
- Two light beams fall on a transparent material block at point 1 and 2 with angle \(\theta_1\) and \(\theta_{2^{\prime}}\) respectively, as shown in figure. After refraction, the beams intersect at point 3 which is exactly on the interface at other end of the block. Given : the distance between 1 and 2, \(\mathrm{d}=4 \sqrt{3} \mathrm{~cm}\) and \(\theta_1=\theta_2=\cos ^{-1}\left(\frac{\mathrm{n}_2}{2 \mathrm{n}_1}\right)\), where refractive index of the block \(\mathrm{n}_2\gt\) refractive index of the outside medium \(\mathrm{n}_1\), then the thickness of the block is ________ cm.
JEE Mains 2025 Hard - \(60\) words can be made using all the letters of the word \(BHBJO,\) with or without meaning. If these words are written as in a dictionary, then the \(50^{\text {th }}\) word is :JEE Mains 2024 Medium
- Let \(a, b \in R\). If the mirror image of the point \(P( a ,6,9)\) with respect to the line \(\frac{x-3}{7}=\frac{y-2}{5}=\frac{z-1}{-9}\) is \((20, b,-a-9),\) then \(|a+b|\) is equal to :JEE Mains 2021 Hard