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Electrochemistry — BITSAT Chemistry PYQs

29 previous year questions from Electrochemistry with answers and solutions. Numbered list, year tags, and one-tap solutions — built for serious JEE / NEET practice.

Electrochemistry — BITSAT Chemistry PYQs

The pH of 0.5 L of 1.0 M NaCl solution after electrolysis for 965 s using 5.0 A current is,

Calculate the molarity of a solution containing 5 g of NaOH dissolved in the product of H ₂- O ₂ fuel cell operated at 1 A current for 595.1 hours. (Assume F =96500 C / mol of elec

When the same quantity of electricity is passed through the aqueous solutions of the given electrolytes for the same amount of time, which metal will be deposited in maximum amount

Which of the following solutions of KCl will have the highest value of specific conductance?

Given that E_ O ₂ / H ₂ O ^ =+1.23 ~V ; aligned & E_ S ₂ O ₈²⁻ / SO ₄²⁻ ^ =2.05 ~V ; E_ Br ₂ / Br ⁻ ^ =+1.09 ~V & E_ Au ³⁺ / Au ^ =+1.4 ~V aligned The strongest oxidising agent is

The conductivity of a weak acid HA of concentration 0.001 ~mol ~L ⁻¹ is 2.0 10⁻⁵ ~S ~cm ⁻¹ . If _ m ^ ( HA )=190 ~S ~cm ^2 ~mol ⁻¹ , the ionization constant ( K _ a ) of HA is equa

Electrode potential data are given below: Fe ⁺³( aq )+ e ⁻ Fe ⁺²( aq ) ; E ^ =+0.77 ~V Al ³⁺( aq )+3 e ⁻ Al _ ( s ) ; E ^ =-1.66 ~V Br ₂( aq )+2 e ⁻ 2 Br ⁻( aq ) ; E ^ =+1.08 ~V Ba

Using the standard electrode potential, find out the pair between which redox reaction is not feasible. E^ values Fe ³⁺ / Fe ²⁺=+0.77 ; I ₂ / I ⁻=+054 Cu ²⁺ / Cu =+0.34 ; Ag ⁺ / Ag

At 25^ C , the molar conductance at infinite dilution for the strong electrolytes NaOH , NaCl and BaCl ₂ are 248 10⁻⁴, 126 10⁻⁴ and 280 10⁻⁴ Sm ² ~mol ⁻¹ respectively. _ m ⁰ Ba ( O

E 1 , E 2 and E 3 are the emf of the following three galvanic cells respectively (i) Zn s Zn 2 + 0 . 1 M Cu 2 + 1 M Cu s (ii) Zn s Zn 2 + 1 M Cu 2 + 1 M Cu s (iii) Zn s Zn 2 + 1 M

What time in sec is required for depositing all the silver present in 125 ml of 1 M AgNO 3 solution by passing a current of 241 . 25 A (Given 1 F = 96500 C )

0 . 5 F of electricity is passed through 500 mL of copper sulphate solution. The amount of copper which can be deposited will be

For a reaction, A + B 2 + &#10230; B + A 2 + , at 25 0 C E 0 = 0 . 2955 V . The value of K eq is

Blocks of magnesium are fixed to the bottom of a ship to

How many moles of Fe 2 + ions are formed when excess of iron react with 500 mL O . 4 N HCl , under inert atmosphere? (assume no change in volume)

The EMF of the cell Tl / Tl ⁺(0.001 M ) | Cu ²⁺(0.01 M ) / Cu is 0.83 . The cell EMF can be increased by

Electrolysis is carried out in three cells (A) 1.0 M OuSO ₄ Pt electrode (B) 1.0 M CuSO ₄ copper electrodes (C) 1.0 M KCl Pt electrodes If volume of electrolytic solution is mainta

The equilibrium constant for the disproportionation reaction 2 Cu ⁺( aq ) Cu ( s )+ Cu ²⁺( ag ) at 25^ C ( E ^ Cu ⁺ / Cu =0.52 ~V , E ^ Cu ²⁺ / Cu =0.16 ~V ) is

The efficiency of fuel cell is given by the expression, is

The mass of the substance deposited when one Faraday of charge is passed through its solution is equal to

In the cell reaction Cu ( s )+2 Ag ⁺( aq ) Cu ²⁺( aq )+2 Ag ( s ) E _ cell ⁰=0.46 ~V . By doubling the concentration of Cu ²⁺, E _ cell ⁰ is

Cu _ aq ⁺ is unstable in solution and undergoes simultaneous oxidation and reduction according to the reaction : 2 Cu ⁺( aq ) Cu ²⁺( aq )+ Cu ( s ) choose correct E ^ for above rea

A current of 2.0 A passed for 5 hours through a molten metal salt deposits 22.2 ~g of metal (At wt. =177 ). The oxidation state of the metal in the metal salt is

The electrolytic cells, one containing acidified ferrous chloride and another acidified ferric chloride are connected in series. The ratio of iron deposited at cathodes in the two

The ionic conductance of Ba ²⁺ and Cl ⁻ respectively are 127 and 76 ⁻¹ ~cm ² at infinite dilution. The equivalent conductance of BaCl ₂ , at infinite dilution will be

The number of coulombs required for the deposition of 108 ~g of silver is

When the sample of copper with zinc impurity is to be purified by electrolysis, the appropriate electrodes are

The conductivity of a saturated solution of BaSO ₄ is 3.06 10⁻⁶ ohm ⁻¹ ~cm ⁻¹ and its equivalent conductance is 1.53 ohm ⁻¹ ~cm ² equiv ⁻¹ . The K _ sp for BaSO ₄ will be

In a cell that utilises the reaction Zn ( s )+2 H ⁺( aq ) Zn ²⁺( aq )+ H ₂( ~g ) addition of H ₂ SO ₄ to cathode compartment, will

For a reaction, A + B 2 + ⟶ B + A 2 + , at 25 0 C E 0 = 0 . 2955 V . The value of K eq is