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Chapter–2 : Electrochemistry (विद्युत रसायन)
Question Type: MCQ (Application Based)
Each Question: 0.5 Mark
Total Questions: 50
Total Marks: 25
Q1.
In Daniell cell, electrons flow from —
डेनियल सेल में इलेक्ट्रॉनों का प्रवाह होता है —
A) Cathode to anode
B) Salt bridge
C) Zinc to copper electrode ✅
D) Copper to zinc electrode
Answer: C
Explanation: Zinc undergoes oxidation and releases electrons.
Q2.
If oxidation occurs at an electrode, that electrode acts as —
जिस इलेक्ट्रोड पर ऑक्सीकरण होता है, वह होता है —
A) Cathode
B) Anode ✅
C) Salt bridge
D) Electrolyte
Answer: B
Explanation: Oxidation always occurs at anode.
Q3.
Unit of standard electrode potential is —
मानक इलेक्ट्रोड विभव की इकाई है —
A) Ampere
B) Ohm
C) Volt ✅
D) Coulomb
Answer: C
Explanation: Electrode potential is a potential difference.
Q4.
EMF of a cell is maximum when —
किस स्थिति में सेल का EMF अधिकतम होगा —
A) Cell is at equilibrium
B) No current flows
C) Cell reaction is spontaneous ✅
D) Resistance is infinite
Answer: C
Explanation: Spontaneous reaction produces maximum EMF.
Q5.
If E°cell is positive, then reaction is —
यदि E°cell धनात्मक है, तो अभिक्रिया होगी —
A) Non-spontaneous
B) At equilibrium
C) Spontaneous ✅
D) Impossible
Answer: C
Explanation: Positive E°cell indicates feasibility.
Q6.
Relation between ΔG° and E°cell is —
ΔG° और E°cell के बीच संबंध है —
A) ΔG° = +nFE°
B) ΔG° = −nFE° ✅
C) ΔG° = nF/E°
D) ΔG° = 0
Answer: B
Explanation: Free energy decreases for spontaneous reactions.
Q7.
If ΔG° is negative, then cell reaction is —
यदि ΔG° ऋणात्मक है, तो अभिक्रिया —
A) Non-spontaneous
B) Spontaneous ✅
C) Reversible
D) Impossible
Answer: B
Explanation: Negative ΔG° means reaction occurs naturally.
Q8.
Unit of electrical conductance is —
विद्युत चालकता की इकाई है —
A) Ohm
B) Ohm⁻¹ / Siemens ✅
C) Volt
D) Ampere
Answer: B
Explanation: Conductance = 1 / resistance.
Q9.
Specific conductivity depends on —
विशिष्ट चालकता निर्भर करती है —
A) Nature of electrolyte
B) Concentration
C) Temperature
D) All of these ✅
Answer: D
Explanation: All factors affect ionic mobility.
Q10.
Molar conductivity increases on dilution because —
मोलर चालकता तनुकरण पर बढ़ती है क्योंकि —
A) Resistance increases
B) Number of ions increases
C) Ion mobility increases ✅
D) Temperature increases
Answer: C
Explanation: Inter-ionic attraction decreases.
Q11.
At infinite dilution, molar conductivity is denoted by —
अनंत तनुकरण पर मोलर चालकता कहलाती है —
A) Λm
B) Λ°m ✅
C) κ
D) G
Answer: B
Explanation: Standard symbol for limiting molar conductivity.
Q12.
Kohlrausch’s law is applicable to —
कोहलरौश का नियम लागू होता है —
A) Strong electrolytes only
B) Weak electrolytes only
C) All electrolytes at infinite dilution ✅
D) Concentrated solutions
Answer: C
Explanation: At infinite dilution, ions act independently.
Q13.
Unit of molar conductivity is —
मोलर चालकता की इकाई है —
A) S m² mol⁻¹ ✅
B) S m⁻¹
C) Ohm m
D) Volt
Answer: A
Q14.
Electrolysis involves conversion of —
विद्युत अपघटन में परिवर्तन होता है —
A) Electrical → Mechanical
B) Chemical → Electrical
C) Electrical → Chemical ✅
D) Heat → Electrical
Answer: C
Q15.
During electrolysis, oxidation occurs at —
विद्युत अपघटन में ऑक्सीकरण होता है —
A) Cathode
B) Anode ✅
C) Electrolyte
D) Salt bridge
Answer: B
Q16.
Faraday’s first law relates mass with —
फैराडे का प्रथम नियम संबंध बताता है —
A) Voltage
B) Charge passed ✅
C) Resistance
D) Time only
Answer: B
Q17.
If current is doubled, mass deposited will —
यदि धारा दोगुनी की जाए, तो निक्षेपित द्रव्यमान —
A) Remain same
B) Become half
C) Become double ✅
D) Become zero
Answer: C
Q18.
Faraday’s constant represents charge on —
फैराडे स्थिरांक दर्शाता है —
A) One electron
B) One ion
C) One mole of electrons ✅
D) One atom
Answer: C
Q19.
Value of Faraday constant is approximately —
फैराडे स्थिरांक का मान है —
A) 965 C
B) 9650 C
C) 96500 C mol⁻¹ ✅
D) 965000 C
Answer: C
Q20.
During electrolysis of molten NaCl, sodium is obtained at —
गलित NaCl के विद्युत अपघटन में सोडियम प्राप्त होता है —
A) Anode
B) Cathode ✅
C) Both
D) Neither
Answer: B
Q21.
Electrochemical cell converts —
विद्युत रासायनिक सेल परिवर्तित करता है —
A) Chemical → Electrical energy ✅
B) Electrical → Chemical
C) Heat → Chemical
D) Mechanical → Electrical
Q22.
Salt bridge in a cell helps to —
सेल में साल्ट ब्रिज का कार्य है —
A) Increase EMF
B) Maintain electrical neutrality ✅
C) Produce electrons
D) Stop reaction
Q23.
If concentration of electrolyte increases, conductivity —
यदि सांद्रता बढ़े, तो चालकता —
A) Decreases
B) Remains same
C) Increases ✅
D) Becomes zero
Q24.
Which quantity decreases on dilution?
तनुकरण पर कौन-सी मात्रा घटती है —
A) Molar conductivity
B) Specific conductivity ✅
C) Ion mobility
D) Degree of dissociation
Q25.
Nernst equation is used to calculate —
नर्न्स्ट समीकरण उपयोग होता है —
A) Resistance
B) EMF at non-standard conditions ✅
C) Current
D) Charge
Q26.
If reaction quotient equals equilibrium constant, then —
यदि Q = K हो, तो —
A) Ecell = 0 ✅
B) Ecell maximum
C) Reaction spontaneous
D) ΔG° maximum
Q27.
Increase in temperature generally causes conductivity to —
तापमान बढ़ाने पर चालकता —
A) Decrease
B) Remain same
C) Increase ✅
D) Become zero
Q28.
In lead storage cell, electrolyte used is —
लेड स्टोरेज सेल में प्रयुक्त इलेक्ट्रोलाइट —
A) NaCl
B) HCl
C) H₂SO₄ ✅
D) KOH
Q29.
Oxidation number of Zn in Zn²⁺ is —
Zn²⁺ में Zn की ऑक्सीकरण अवस्था —
A) 0
B) +1
C) +2 ✅
D) −2
Q30.
Standard hydrogen electrode potential is —
मानक हाइड्रोजन इलेक्ट्रोड का विभव —
A) +1 V
B) −1 V
C) 0 V ✅
D) +0.5 V
Q31.
If resistance of a solution increases, its conductance will —
यदि किसी विलयन का प्रतिरोध बढ़े, तो उसकी चालकता —
A) Increase
B) Decrease ✅
C) Remain same
D) Become zero
Answer: B
Explanation: Conductance (G = \frac{1}{R}), so increase in resistance decreases conductance.
Q32.
When dilution is increased, molar conductivity approaches —
अधिक तनुकरण पर मोलर चालकता पहुँचती है —
A) Zero
B) Minimum
C) Maximum value (Λ°m) ✅
D) Negative value
Answer: C
Explanation: At infinite dilution, inter-ionic attraction becomes negligible.
Q33.
In electrolysis, number of electrons required to deposit 1 mole of Ag is —
1 मोल Ag के निक्षेपण हेतु आवश्यक इलेक्ट्रॉनों की संख्या —
A) 2
B) 3
C) 1 ✅
D) 0
Answer: C
Explanation: Ag⁺ + e⁻ → Ag, one electron per ion.
Q34.
If current is passed for double time, mass deposited will —
यदि धारा दोगुने समय तक प्रवाहित की जाए, तो निक्षेपित द्रव्यमान —
A) Become half
B) Remain same
C) Become double ✅
D) Become zero
Answer: C
Explanation: According to Faraday’s first law, mass ∝ charge ∝ time.
Q35.
Which factor does NOT affect conductance of an electrolyte?
निम्न में से कौन-सा कारक चालकता को प्रभावित नहीं करता —
A) Concentration
B) Temperature
C) Nature of electrolyte
D) Colour of solution / विलयन का रंग ✅
Answer: D
Explanation: Colour has no role in ionic movement.
Q36.
If E°cell = 0, then the reaction is —
यदि E°cell = 0 हो, तो अभिक्रिया —
A) Spontaneous
B) Non-spontaneous
C) At equilibrium / संतुलन में ✅
D) Impossible
Answer: C
Explanation: Zero EMF indicates equilibrium condition.
Q37.
Increase in ionic mobility causes conductivity to —
आयनिक गतिशीलता बढ़ने से चालकता —
A) Decrease
B) Remain constant
C) Increase ✅
D) Become zero
Answer: C
Explanation: Faster ions carry charge more efficiently.
Q38.
In Daniell cell, salt bridge mainly prevents —
डेनियल सेल में साल्ट ब्रिज मुख्यतः रोकता है —
A) Electron flow
B) Charge accumulation / आवेश संचय ✅
C) Oxidation
D) Reduction
Answer: B
Explanation: It maintains electrical neutrality in half-cells.
Q39.
If concentration of electrolyte is halved, specific conductivity will —
यदि इलेक्ट्रोलाइट की सांद्रता आधी कर दी जाए, तो विशिष्ट चालकता —
A) Increase
B) Decrease ✅
C) Remain same
D) Become infinite
Answer: B
Explanation: Fewer ions per unit volume reduce conductivity.
Q40.
Which reaction occurs at cathode in electrolysis?
विद्युत अपघटन में कैथोड पर कौन-सी अभिक्रिया होती है —
A) Oxidation
B) Neutralization
C) Reduction / अपचयन ✅
D) Hydrolysis
Answer: C
Explanation: Gain of electrons always occurs at cathode.
Q41.
In electrochemical cell, oxidation and reduction occur —
विद्युत रासायनिक सेल में ऑक्सीकरण व अपचयन होते हैं —
A) At same electrode
B) At salt bridge
C) At different electrodes / अलग-अलग इलेक्ट्रोड पर ✅
D) In solution only
Answer: C
Explanation: Oxidation at anode, reduction at cathode.
Q42.
If temperature of electrolyte increases, resistance will —
यदि इलेक्ट्रोलाइट का तापमान बढ़े, तो प्रतिरोध —
A) Increase
B) Decrease ✅
C) Remain same
D) Become infinite
Answer: B
Explanation: Higher temperature increases ionic mobility.
Q43.
Unit of cell constant is —
सेल स्थिरांक की इकाई है —
A) cm
B) cm⁻¹ ✅
C) ohm
D) S m⁻¹
Answer: B
Explanation: Cell constant = l/A, unit is inverse length.
Q44.
If two cells are connected in series, EMF —
यदि दो सेल श्रेणीक्रम में जोड़े जाएँ, तो EMF —
A) Remains same
B) Becomes half
C) Adds up / जुड़ जाता है ✅
D) Becomes zero
Answer: C
Explanation: Series connection increases total potential difference.
Q45.
Which electrolyte shows highest molar conductivity at infinite dilution?
अनंत तनुकरण पर किस इलेक्ट्रोलाइट की मोलर चालकता अधिकतम होती है —
A) Weak electrolyte
B) Strong electrolyte / प्रबल इलेक्ट्रोलाइट ✅
C) Non-electrolyte
D) Colloid
Answer: B
Explanation: Strong electrolytes dissociate completely.
Q46.
During charging of lead storage cell —
लेड स्टोरेज सेल को चार्ज करते समय —
A) Chemical energy → Electrical
B) Electrical energy → Chemical energy ✅
C) Heat → Electrical
D) No energy change
Answer: B
Explanation: Charging is reverse of discharge.
Q47.
If applied EMF is less than E°cell, reaction will —
यदि लगाया गया EMF, E°cell से कम हो, तो अभिक्रिया —
A) Occur rapidly
B) Not occur / नहीं होगी ✅
C) Be spontaneous
D) Reach equilibrium
Answer: B
Explanation: External EMF must overcome cell potential.
Q48.
Degree of dissociation of weak electrolyte increases on —
दुर्बल इलेक्ट्रोलाइट का अपघटन बढ़ता है —
A) Increasing concentration
B) Decreasing temperature
C) Dilution / तनुकरण ✅
D) Adding common ion
Answer: C
Explanation: Dilution reduces inter-ionic attraction.
Q49.
If more charge is passed, amount of substance deposited will —
यदि अधिक आवेश प्रवाहित किया जाए, तो निक्षेपित पदार्थ —
A) Decrease
B) Remain same
C) Increase ✅
D) Become zero
Answer: C
Explanation: Faraday’s law: mass ∝ charge.
Q50.
Electrochemistry mainly deals with relation between —
विद्युत रसायन मुख्यतः संबंध बताता है —
A) Heat and work
B) Mass and volume
C) Chemical reactions and electricity / रासायनिक अभिक्रिया व विद्युत ✅
D) Pressure and temperature
Answer: C
Explanation: Electrochemistry studies interconversion of chemical and electrical energy.
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