# Electrochemistry · Chemistry · COMEDK

Start Practice## MCQ (Single Correct Answer)

COMEDK 2024 Evening Shift

Identify the correct statement regarding corrosion of iron rod left exposed to atmosphere.

COMEDK 2024 Evening Shift

Given below are 2 statements: Assertion and Reason. Choose the correct option.
Assertion: When Molar conductivity for a strong electrolyte is plotted ...

COMEDK 2024 Evening Shift

What is the quantity of charge, in Faraday units, required for the reduction of 3.5 moles of $$\mathrm{Cr}_2 \mathrm{O} 7^{2-}$$ in acid medium?...

COMEDK 2024 Evening Shift

A dry cell consists of a moist paste of $$\mathrm{NH}_4 \mathrm{Cl}$$ and $$\mathrm{ZnCl}_2$$ contained in a $$\mathrm{Zn}$$ casing which encloses a C...

COMEDK 2024 Evening Shift

A current of 3.0A is passed through 750 ml of 0.45 M solution of CuSO$$_4$$ for 2 hours with a current efficiency of 90%. If the volume of the solutio...

COMEDK 2024 Evening Shift

Arrange the following redox couples in the increasing order of their reducing strength:
$$\begin{array}{ll}
{[\mathrm{A}]=\mathrm{Cu} / \mathrm{Cu}^{2...

COMEDK 2024 Morning Shift

What would be the EMF of the cell in which the following reaction occurs:
$$\begin{aligned}
& \mathrm{Cd}(\mathrm{S})+2 \mathrm{H}^{+} \rightarrow \ma...

COMEDK 2024 Morning Shift

Propane in presence of $$\mathrm{O}_2$$ gas undergoes complete combustion to produce $$\mathrm{CO}_2$$ and $$\mathrm{H}_2 \mathrm{O}$$. The required $...

COMEDK 2024 Morning Shift

$$0.1 \mathrm{M}$$ solution of $$\mathrm{AgNO}_3$$ is taken in a Conductivity cell and a potential difference of $$40 \mathrm{~V}$$ is applied across ...

COMEDK 2024 Morning Shift

Match the chemical reactions taking place at the Anode of the cell with the correct cell in which the reaction occurs.
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COMEDK 2024 Morning Shift

Given below are 4 equations showing Molar conductivities at infinite dilution of various electrolytes. Which one of them represents the correct equati...

COMEDK 2023 Morning Shift

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} \...

COMEDK 2023 Morning Shift

For a cell reaction, $$A(s)+B^{2+}(a q) \longrightarrow A^{2+}(a q)+B(s)$$; the standard emf of the cell is $$0.295 \mathrm{~V}$$ at $$25^{\circ} \mat...

COMEDK 2023 Evening Shift

The Molar conductivity of $$0.05 \mathrm{M}$$ solution of $$\mathrm{MgCl}_2$$ is $$194.5 \mathrm{~ohm}^{-1} \mathrm{~cm}^2$$ per mole at room temperat...

COMEDK 2023 Evening Shift

If electrolysis of water is carried out for a time duration of 2 hours, how much electric current in amperes would be required to liberate $$100 \math...

COMEDK 2023 Evening Shift

Match the items in Column I with their description in Column II
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COMEDK 2023 Evening Shift

When Lead Storage battery is in the process of getting charged which one of the following reactions takes place?

COMEDK 2023 Evening Shift

The reaction taking place in a galvanic cell is as given
$$\mathrm{A}(\mathrm{s})+\mathrm{B}^{2+}\left(\mathbf{1} \mathbf{1} \mathbf{1 0} \mathbf{0}^{...

COMEDK 2022

What will be the emf of the following cell at 25$$^\circ$$C?
Fe/Fe$$^{2+}$$ (0.001 M) | | H$$^+$$ (0.01 M) | H$$_2$$(g) (1 Bar) | Pt(s)
$$E_{(F{e^{2+}...

COMEDK 2022

Calculate the molar conductance of 0.025 M aqueous solution of calcium chloride at 25$$^\circ$$C. The specific conductance of calcium chloride is 12.0...

COMEDK 2021

Given that molar conductances for Ba(OH)$$_2$$, BaCl$$_2$$ and NH$$_4$$Cl are 523.28, 280.0 and 129.8 $$\Omega^{-1}$$ cm$$^2$$ mol$$^{-1}$$ respective...

COMEDK 2021

The specific conductivity of a solution containing 1.0 g of anhydrous BaCl$$_2$$ in 200 cm$$^3$$ of the solution has been found to be 0.0058 Scm$$^{-1...