Quantrex Quantrex AcademyJEE · NEET · NDA PYQs with solutions Open app
JIPMER 2010
Exam
JIPMER
Year
2010
Subject
Chemistry
Chapter
Electrochemistry

JIPMER 2010 · Chemistry · Electrochemistry

How long it will take to deposit 1.0 g of chromium when a current...

How long it will take to deposit 1.0 g of chromium when a current of 1.25 A flows through a solution of chromium (III) sulphate ? (Molar mass of Cr=52\mathrm{Cr}=52 )

Options

  1. A1.24 min
  2. B1.24 h
  3. C1.24 s
  4. DNone of these

Correct answer

B. 1.24 h

Step-by-step solution

Cr3++3e−⟶Cr(s)\mathrm{Cr}^{3+}+3 e^{-} \longrightarrow \mathrm{Cr}(s) 3 mol or 3×96500C3 \times 96500 \mathrm{C} of electricity are needed to deposit 1 mol or 52 g of Cr . 52 g of Cr require current =3×96500C=3 \times 96500 \mathrm{C} 1 g of Cr will require current =3×9650052C=5567.3C\begin{aligned} & =\frac{3 \times 96500}{52} \mathrm{C} \\ & =5567.3 \mathrm{C} \end{aligned} Now, number of coulombs = current (ampere) ×t (seconds) ∴ Time (s) required = no. of coulombs  current (ampere) =5567.3C1.25 A=4453.8 s or =1.24 h\begin{aligned} & =\text{ current (ampere) } \times t \text{ (seconds) } \\ & \therefore \text{ Time (s) required }=\frac{\text{ no. of coulombs }}{\text{ current (ampere) }} \\ & =\frac{5567.3 \mathrm{C}}{1.25 \mathrm{~A}} \\ & =4453.8 \mathrm{~s} \\ & \text{ or } \\ & =1.24 \mathrm{~h} \\ & \end{aligned}
Practice Electrochemistry on Quantrex Academy →

More from Electrochemistry

Calculate the conductivity of 0.025 M BaCl_2 solution if the molar conductivity of salt… MHT CET Medical 2026Calculate the equilibrium constant at 25\ ^ ^ ∘ C for the cell reaction, Ni(s) + Cu^ 2+… MHT CET Medical 2026Calculate the time required in second to deposit 5.85 g Ni from NiCl_2 solution by… MHT CET Medical 2026Which of the following cell reactions is exhibited by fuel cell? MHT CET Medical 2026Which of the following types of cells is used for electroplating? MHT CET Medical 2026Which of the following acts as a cathode in a dry cell? MHT CET Medical 2026What is the Standard cell potential of a cell constituted by two electrodes, A (E^0_… MHT CET Medical 2026How long (in minutes) must a 2\ A current be passed through AgNO_3 solution to deposit… MHT CET Medical 2026 Full Electrochemistry list All JIPMER PYQs