Recommended PYQs (STRICTLY NCERT Based) Electrochemistry Chemistry NEET Practice Questions, MCQs, Past Year Questions (PYQs), NCERT Questions, Question Bank, Class 11 and Class 12 Questions, and PDF solved with answers

Match List I with List II.

List I (Conversion)		List II (Number of Faraday required)
A.	1 mol of H₂O to O₂	I.	3F
B.	1 mol of $MnO^-_4$ to $Mn^{2+}$	II.	2F
C.	1.5 mol of $Ca$ from molten $CaCl_2$	III.	1F
D.	1 mol of FeO to Fe₂O₃	IV.	5F

Choose the correct answer from the options given below:
1. A - III, B - IV, C - I, D - II
2. A - II, B - III, C - I, D - IV
3. A - III, B - IV, C - II, D - I
4. A - II, B - IV, C - I, D - III

Subtopic: Faraday’s Law of Electrolysis |

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NEET - 2024

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Q2:

Mass in grams of copper deposited by passing 9.6487 A current through a voltmeter containing copper sulphate for 100 seconds is(Given : Molar mass of Cu:

63 g m o l^{- 1}

$63 g mol^{-1}$ F = 96487 C)

1. 0.315 g
2. 31.5 g
3. 0.0315 g
4. 3.15 g

Subtopic: Faraday’s Law of Electrolysis |

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Q3:

Given below are two statements:

Statement I:	$2 \mathrm{~F}$ electricity is required for the oxidation of 1 mole $\mathrm{H}_2 \mathrm{O}$ to $\mathrm{O}_2$ .
Statement II:	To get $40.0 \mathrm{~g}$ of Aluminium from molten $\mathrm{Al}_2 \mathrm{O}_3$ required electricity is $4.44 \mathrm{~F}$ .

In the light of the above statements, choose the correct answer from the options given below:
1. Both Statement I and Statement II are true
2. Both Statement I and Statement II are false
3. Statement I is true but Statement II is false
4. Statement I is false but Statement II is true

Subtopic: Faraday’s Law of Electrolysis |

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Q4:

From the following select the one which is not an example of corrosion:

1.	Rusting of an iron object
2.	Production of hydrogen by electrolysis of water
3.	Tarnishing of silver
4.	Development of green coating on copper and bronze ornaments

Subtopic: Corrosion |

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Q5:

The standard cell potential of the following cell

Z n | {Z n}^{2 +} (a q) ‖ {F e}^{2 +} (a q) | F e is 0.32 V .

$\mathrm{Zn}\left|\mathrm{Zn}^{2+}(\mathrm{aq}) \| \mathrm{Fe}^{2+}(\mathrm{aq})\right| \mathrm{Fe}~\text{ is }~0.32 \mathrm{~V}.$ Calculate the standard Gibbs energy change for the reaction:

Z n (s) + {F e}^{2 +} (a q) \to {Z n}^{2 +} (a q) + F e (s)

$\mathrm{Zn}(\mathrm{s})+\mathrm{Fe}^{2+}(\mathrm{aq}) \rightarrow \mathrm{Zn}^{2+}(\mathrm{aq})+\mathrm{Fe}(\mathrm{s})$

(Given :

1 F = 96487 C m o l^{- 1}

$1 \mathrm{~F}=96487 \mathrm{C} mol^{-1}$ )

1.

- 61.75 k J {m o l}^{- 1}

$-61.75 \mathrm{~kJ} \mathrm{~mol}^{-1}$
2.

+ 5.006 k J {m o l}^{- 1}

$+5.006 \mathrm{~kJ} \mathrm{~mol}^{-1}$
3.

- 5.006 k J {m o l}^{- 1}

$-5.006 \mathrm{~kJ} \mathrm{~mol}^{-1}$
4.

+ 61.75 k J {m o l}^{- 1}

$+61.75 \mathrm{~kJ} \mathrm{~mol}^{-1}$

Subtopic: Relation between Emf, G, Kc & pH |

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Q6:

Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R):

Assertion (A):	In equation $\Delta_{\mathrm{r}} \mathrm{G}=-\mathrm{nFE} _{\text {cell }},$ value $\mathrm{\Delta_rG }$ depends on n.
Reason (R):	$\mathrm{E_{cell} }$ is an intensive property and $\mathrm{\Delta_rG }$ is an extensive property.

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

1.	(A) is False but (R) is True.
2.	Both (A) and (R) are True and (R) is the correct explanation of (A).
3.	Both (A) and (R) are True and (R) is not the correct explanation of (A).
4.	(A) is True but (R) is False.

Subtopic: Relation between Emf, G, Kc & pH |

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From NCERT

NEET - 2023

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Q7:

The conductivity of centimolar solution of KCl at 25°C is 0.0210 ohm^–1cm^–1and the resistance of the cell containing the solution at 25°C is 60 ohm. The value of the cell constant is:

1.	3.34cm^–1	2.	1.34cm^–1
3.	3.28cm^–1	4.	1.26cm^–1

Subtopic: Conductance & Conductivity |

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Q8:

The molar conductance of an electrolyte increases with dilution according to the equation:

Λ_{m} = Λ_{m}^{\circ} - A \sqrt{c}

$\Lambda_{\mathrm{m}}=\Lambda_{\mathrm{m}}^{\circ}-\mathrm{A} \sqrt{\mathrm{c}}$
Consider the following four statements:

A:	This equation applies to both strong and weak electrolytes.
B:	The value of the constant A depends upon the nature of the solvent.
C:	The value of constant A is the same for both $BaCl_2$ and $MgSO_4$
D:	The value of constant A is the same for both $BaCl_2$ and $Mg(OH)_2$

Which of the above statements are correct?

1.	(A) and (B) only	2.	(A), (B), and (C) only
3.	(B) and (C) only	4.	(B) and (D) only

Subtopic: Conductance & Conductivity |

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Q9:

The correct value of cell potential in volt for the reaction that occurs when the following two half cells are connected, is:

{F e}_{(a q)}^{2 +} + 2 e^{-} \to F e (s), E^{\circ} = - 0.44 V

$\mathrm{{Fe}_{ {(aq) }}^{2+}+2 {e}^{-} \rightarrow {Fe}({s}), {E}^{\circ}=-0.44{~V} }$

{C r}_{2} O_{7}^{2 -}_{(a q)} + 14 H^{+} + 6 e^{-} \to 2 {C r}^{3 +} + 7 H_{2} O,

$\mathrm{{Cr}_2 {O}_7^{2-}{ }_{ {(aq) }}+14 {H}^{+}+6 e^{-} \rightarrow 2 {Cr}^{3+}+7 {H}_2 {O}},$

E^{\circ} = + 1.33 V

$\mathrm{{E}^{\circ}=+1.33 {~V}}$
1. +1.77 V
2. +2.65 V
3. +0.01 V
4. +0.89 V

Subtopic: Electrode & Electrode Potential |

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Q10:

The molar conductance of a solution, given its conductivity (0.248 S m^–1) and concentration (0.2 mol m^–3) is:
1. 0.124 S cm² mol^–1
2. 1.24 S m²mol^–1
3. 124 S cm² mol^–1
4. 124 S m² mol^–1

Subtopic: Conductance & Conductivity |

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