JEE Mains · Chemistry · STD 12 - 2. Electrochemistry
The reaction at cathode in the cells commonly used in clocks involves _______.
- A reduction of \(\mathrm{Mn}\) from \(+4 to +3\)
- B oxidation of \(\mathrm{Mn}\) from \(+3 to +4\)
- C reduction of \(\mathrm{Mn}\) from \(+7 to +2\)
- D oxidation of \(\mathrm{Mn}\) from \(+2 to +7\)
Answer & Solution
Correct Answer
(A) reduction of \(\mathrm{Mn}\) from \(+4 to +3\)
Step-by-step Solution
Detailed explanation
In the cathode reaction manganese \((\mathrm{Mn})\) is reduced from the \(+4\) oxidation state to the \(+3\) state.
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 increasing order of reactivity of the following compounds towards reaction with alkyl halide directly is
JEE Mains 2019 Hard - 0.1 mol of the following given antiviral compound \((\mathrm{P})\) will weigh ________ \(\times 10^{-1} \mathrm{~g}\).
(Given : molar mass in \(\mathrm{g} \mathrm{mol}^{-1} \mathrm{H}: 1, \mathrm{C}: 12, \mathrm{~N}: 14\), \(\mathrm{O}: 16, \mathrm{~F}: 19, \mathrm{I}: 127)\)JEE Mains 2025 Medium - Number of stereo centers present in linear and cyclic structures of glucose are respectivelyJEE Mains 2019 Medium
- The pair having the same magnetic moment is : [At. No.: \(Cr= 24,\,Mn= 25, \,Fe= 26, \,Co= 27\)]JEE Mains 2016 Hard
- The \(Cl - Co - Cl\) bond angle values in a fac\(\left[ Co \left( NH _3\right)_3 Cl _3\right]\) complex is/are:JEE Mains 2023 Medium
- Drug \(X\) becomes ineffective after \(50 \%\) decomposition. The original concentration of drug in a bottle was \(16 \mathrm{mg} / \mathrm{mL}\) which becomes \(4 \mathrm{mg} / \mathrm{mL}\) in 12 months. The expiry time of the drug in months is __________. Assume that the decomposition of the drug follows first order kinetics.JEE Mains 2025 Easy
More PYQs from JEE Mains
- Which of the following compounds will give silver mirror with ammoniacal silver nitrate?
(A) Formic acid
(B) Formaldehyde
(C) Benzaldehyde
(D) Acetone
Choose the correct answer from the options given below :JEE Mains 2024 Medium - The correct sequence of correct reagents for the following transformation is
JEE Mains 2021 Hard - If wattless current flows in the \(AC\) circuit, then the circuit isJEE Mains 2022 Medium
- For using a multimeter to identify diode from electrical components. choose the correct statement out of the following about the diodeJEE Mains 2022 Medium
- Find the truth table for the function \(Y\) and \(A\) and \(B\) represented in the following figure.
JEE Mains 2021 Medium - A person standing on an open ground hears the sound of a jet aeroplane, coming from north at an angle \(60^o\) with ground level. But he finds the aeroplane right vertically above his position. If \(\upsilon \) is the speed of sound, speed of the plane isJEE Mains 2019 Easy