COMEDK · Chemistry · 18. Electrochemistry
Assuming no change in volume, the time required to obtain solution of \(\mathrm{pH}=4\) by electrolysis of \(100 \mathrm{~mL}\) of \(0.1 \mathrm{M} \mathrm{NaOH}\) (using current \(0.5 \mathrm{~A}\) ) will be
- A 1.93s
- B 2.63s
- C 1.80s
- D 4.26s
Answer & Solution
Correct Answer
(A) 1.93s
Step-by-step Solution
Detailed explanation
\(\left[\mathrm{H}^{+}\right]=10^{-4} \mathrm{M}\) No. of moles of \(\mathrm{NaOH}\) in \(100 \mathrm{~mL}\) solution \(=\frac{M V}{1000}=\frac{10^{-4} \times 100}{1000}=10^{-5}\) Mass of \(\mathrm{NaOH}\) in solution \(=10^{-5} \times 40=4 \times 10^{-4} \mathrm{~g}\) By…
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
- Abnormal colligative properties are observed only when the dissolved non-volatile solute in a given dilute solutionCOMEDK 2023 Easy
- Presence of halogen in organic compounds can be detected usingCOMEDK 2020 Easy
- The density of a gas \(A\) is thrice that of a gas \(B\) at the same temperature. The molecular weight of gas \(B\) is twice that of \(A\). What will be the ratio of pressure acting on \(B\) and \(A\) ?COMEDK 2021 Medium
- An endothermic reaction, \(A \rightarrow B\) has an activation energy as \(x \mathrm{~kJ} / \mathrm{mol}\). If the energy change of the reaction is \(y \mathrm{~kJ}\), the activation energy of the reverse reaction isCOMEDK 2014 Medium
- In the estimation of element \(\mathrm{X}\) in an organic compound, \(0.8 \mathrm{~g}\) of the compound containing \(\mathrm{X}\) was heated with fuming \(\mathrm{HNO}_3\) and the cooled product was treated with barium chloride. The mass of barium sulphate precipitated was \(1.2 \mathrm{~g}\). What is the percentage of element \(\mathrm{X}\) and what is the formula of the violet-coloured compound formed when Lassaigne's extract of the organic compound is treated with sodium nitroprusside?COMEDK 2024 Medium
- Which of the following species do not show disproportionation reaction?COMEDK 2014 Easy
More PYQs from COMEDK
- The distance between the foci of a hyperbola is 16 and its eccentricity is \(\sqrt{2}\). Then its equation isCOMEDK 2023 Medium
- If \(A=\left[\begin{array}{lll}a & 0 & 0 \\ 0 & a & 0 \\ 0 & 0 & a\end{array}\right]\), then \(|A|| \operatorname{adj} A \mid\) is equal toCOMEDK 2022 Medium
- A plano-convex lens made of refractive index 1.5 and having radius of curvature \(\mathrm{R}=4 \mathrm{~cm}\) fits exactly into a planoconcave lens made of refractive index 1.3 and having the same radius of curvature \(R=4 \mathrm{~cm}\) such that their plane surfaces are parallel to each other. The focal length of the combination is:COMEDK 2025 Medium
- Let \(f(x) = x\sqrt{4ax - x^2}, a > 0\) then \(f(x)\) at \(x = 2a\) isCOMEDK 2025 Medium
- \(\int e^x\left(1+\tan x+\tan ^2 x\right) d x \text { is equal to }\)COMEDK 2023 Easy
- A fish in water (refractive index \(n\) ) looks at a bird vertically above in the air. If \(y\) is the height of the bird and \(x\) is the depth of the fish from the surface, then the distance of the bird as estimated by the fish isCOMEDK 2023 Easy