COMEDK · Chemistry · 18. Electrochemistry
Match the chemical reactions taking place at the Anode of the cell with the correct cell in which the reaction occurs.
| No. | Anodic Reaction | No. | Cell |
|---|---|---|---|
| A | \(Zn(Hg) + 2OH^- \to ZnO_{(s)} + H_2O + 2e^-\) | P | Fuel cell |
| B | \(2H_2(g) + 4OH^- \to 4H_2O(l) + 4e^-\) | Q | Leclanche cell |
| C | \(Zn_{(s)} \to Zn^{2+} + 2e^-\) | R | Nickel Cadmium storage cell |
| D | \(Cd_{(s)} + 2OH^- \to CdO_{(s)} + H_2O(l) + 2e^-\) | S | Mercury cell |
- A \(\mathrm{A}=\mathrm{S} \quad \mathrm{B}=\mathrm{R} \quad \mathrm{C}=\mathrm{Q} \quad \mathrm{D}=\mathrm{P}\)
- B \(\mathrm{A}=\mathrm{Q} \quad \mathrm{B}=\mathrm{S} \quad \mathrm{C}=\mathrm{P} \quad \mathrm{D}=\mathrm{R}\)
- C \(\mathrm{A}=\mathrm{S} \quad \mathrm{B}=\mathrm{P} \quad \mathrm{C}=\mathrm{R} \quad \mathrm{D}=\mathrm{Q}\)
- D \(\mathrm{A}=\mathrm{S} \quad \mathrm{B}=\mathrm{P} \quad \mathrm{C}=\mathrm{Q} \quad \mathrm{D}=\mathrm{R}\)
Answer & Solution
Correct Answer
(D) \(\mathrm{A}=\mathrm{S} \quad \mathrm{B}=\mathrm{P} \quad \mathrm{C}=\mathrm{Q} \quad \mathrm{D}=\mathrm{R}\)
Step-by-step Solution
Detailed explanation
The anodic reaction \(\mathrm{Zn}(\mathrm{Hg})+2 \mathrm{OH}^{-} \rightarrow \mathrm{ZnO}_{(\mathrm{S})}+\mathrm{H}_2 \mathrm{O}+2 e\) occurs in the Mercury cell (S). The anodic reaction \(2 \mathrm{H}_2(g)+4 \mathrm{OH}^{-} \rightarrow 4 \mathrm{H}_2 \mathrm{O}(l)+4 e\) occurs…
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
- Which statement is incorrect about aminoacids?COMEDK 2025 Easy
- Hofmann's bromamide reaction is to convertCOMEDK 2020 Medium
- Choose the statements which are incorrect in the case of Lanthanoids.
A. \(\mathrm{Ce}^{4+}\) is diamagnetic while \(\mathrm{Sm}^{3+}\) is paramagnetic.
B. The atomic size of the transition metals having atomic number greater than 71 are very close to that of the elements above them.
C. Lanthanoids react with hot water forming water soluble \(\mathrm{Ln}(\mathrm{OH})_3\) with the liberation of \(\mathrm{O}_2\).
D. The general electronic configuration of Lanthanoids is \((n-2) f^{1-14} 5 d^0 6 s^2\), where \(n=6\).COMEDK 2025 Medium - \(\Delta H\) and \(\Delta S\) were found to be both positive for a reversible reaction at temperature ' T '. If the equilibrium temperature is \(\mathrm{T}_{\mathrm{o}}\), the reaction will be spontaneous whenCOMEDK 2025 Easy
- With reference to Pauling's Electronegativity scale, which one of the following options shows the correct order of electronegativity values of elements?COMEDK 2024 Easy
- When chlorine is passed through boiling toluene, we getCOMEDK 2019 Medium
More PYQs from COMEDK
- \(\text { If } \alpha=\tan ^{-1}\left(\tan \dfrac{5 \pi}{4}\right) \text { and } \beta=\tan ^{-1}\left(-\tan \dfrac{2 \pi}{3}\right) \text { then }\)COMEDK 2024 Medium
- If \(a, b, c\) are real numbers and \(\omega\) is a complex cube root of unity such that \(a+b \omega+c \omega^{2}=0\), thenCOMEDK 2017 Medium
- Mercury is a liquid metal becauseCOMEDK 2017 Easy
- \(1 \mathrm{~mm}^{3}\) of a gas is compressed at 1 atmospheric pressure and temperature \(27^{\circ} \mathrm{C}\) to \(627^{\circ} \mathrm{C}\). What is the final pressure under adiabatic condition? \((\gamma\) for the gas \(=15\) )COMEDK 2020 Easy
- Which among the following is diamagnetic?COMEDK 2023 Medium
- Which of the following is a dichroic crystal?COMEDK 2018 Easy