jee main chemistry important questions | Electrochemistry jee main questions FREE

Q 1 :

40 mL of a mixture of ${CH}_{3} COOH$ and HCl (aqueous solution) is titrated against 0.1 M NaOH solution conductometrically. Which of the following statement is correct?
[2025]

The concentration of ${CH}_{3} COOH$ in the original mixture is 0.005 M.
The concentration of HCl in the original mixture is 0.005 M.
${CH}_{3} COOH$ is neutralised first followed by neutralisation of HCl.
Point ‘C’ indicates the complete neutralisation of HCl.

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(2)

First NaOH reacts with HCl. Point B indicates complete neutralization of HCl. 2 mL of NaOH is used to neutralize HCl.

When NaOH completely neutralizes HCl:

$mmol of NaOH = mmol of HCl$

$M_{NaOH} \times V_{NaOH} (that reacts with HCl) = M_{HCl} \times V_{HCl}$

$0.1 \times 2 = M_{HCl} \times 40$

$M_{HCl} = 0.005 M$

When HCl is completely neutralized, then NaOH reacts with ${CH}_{3} COOH$ . Thus, (5−2) mL = 3 mL of NaOH reacts with ${CH}_{3} COOH$ . Point C indicates complete neutralization of ${CH}_{3} COOH$ .

When NaOH completely neutralizes ${CH}_{3} COOH$ :

$mmol of NaOH = {mmol of CH}_{3} COOH$

$M_{N a O H} \times V_{N a O H}$ (that reacts with ${CH}_{3} COOH$ )

$= M_{C H_{3} C O O H} \times V_{C H_{3} C O O H}$

$0.1 \times 3$ $= M_{C H_{3} C O O H} \times 40$

$M_{C H_{3} C O O H} = 0.0075 M$

Q 2 :

Given below are two statements: [2025]

Statement I: Corrosion is an electrochemical phenomenon in which pure metal acts as an anode and impure metal as a cathode.

Statement II: The rate of corrosion is more in alkaline medium than in acidic medium.

In the light of the above statements, choose the correct answer from the options given below:

Both Statement I and Statement II are false
Both Statement I and Statement II are true
Statement I is true but Statement II is false
Statement I is false but Statement II is true

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(3)

Rate of corrosion is generally more in acidic medium.

Q 3 :

For a closed circuit Daniell cell, which of the following plots is the accurate one at a given temperature? [2026]

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(1)

Q 4 :

MX is a sparingly soluble salt that follows the given solubility equilibrium at 298 K.

$M X (s) ⇋ M^{+} (a q) + X^{-} (a q); K_{s p} = 10^{- 10}$

If the standard reduction potential for $M^{+} (a q) \overset{+ e^{-}}{\to} M (s)$ is $(E_{M^{+} / M}^{⊝}) = 0.79 V,$ then the value of the standard reduction potential for the metal/metal insoluble salt electrode $E_{X^{-} / M X (s) / M}^{⊝}$ is ___________________mV. (nearest integer).

$[Given: \frac{2.303 R T}{F} = 0.059 V]$ [2026]

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495

Q 5 :

Consider the following electrochemical cell :

$P t | O ₂ (g) (1 b a r) | H C l (a q) ‖ M ² ⁺ (a q, 1.0 M) | M (s)$

The pH above which, oxygen gas would start to evolve at anode is ________ (nearest integer).

[2026]

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4

Topic Question Set

Q 1 :

40 mL of a mixture of ${CH}_{3} COOH$ and HCl (aqueous solution) is titrated against 0.1 M NaOH solution conductometrically. Which of the following statement is correct?
[2025]

Q 3 :

For a closed circuit Daniell cell, which of the following plots is the accurate one at a given temperature? [2026]

0%

Q 5 :

Consider the following electrochemical cell :

$P t | O ₂ (g) (1 b a r) | H C l (a q) ‖ M ² ⁺ (a q, 1.0 M) | M (s)$

The pH above which, oxygen gas would start to evolve at anode is ________ (nearest integer).

[2026]

0%

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