JEE Main Physical Chemistry — Electrochemistry & Kinetics: Redox Reactions and Electrochemistry – Chapter Test

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Difficulty: 10 medium · 10 hard

Redox Reactions and Electrochemistry MCQ questions with answers

The first 3 of 20 questions. Unlock the series for the rest, each with a solution.

1. Q1. Given the standard reduction potentials E°(MnO4⁻/Mn²⁺) = +1.51 V, E°(Cr2O7²⁻/Cr³⁺) = +1.33 V, E°(Cl2/Cl⁻) = +1.36 V and E°(Fe³⁺/Fe²⁺) = +0.77 V, the strongest oxidising agent among these species is:

   दिए गए मानक अपचयन विभव E°(MnO4⁻/Mn²⁺) = +1.51 V, E°(Cr2O7²⁻/Cr³⁺) = +1.33 V, E°(Cl2/Cl⁻) = +1.36 V तथा E°(Fe³⁺/Fe²⁺) = +0.77 V के आधार पर, इन स्पीशीज़ में सबसे प्रबल ऑक्सीकारक है:

   • A. Cr2O7²⁻
   • B. Fe³⁺
   • C. Cl2
   • D. MnO4⁻
   Solution

   A larger (more positive) standard reduction potential means a stronger oxidising agent. MnO4⁻ has the highest value (+1.51 V), so it is the strongest oxidising agent.

   अधिक (अधिक धनात्मक) मानक अपचयन विभव का अर्थ है अधिक प्रबल ऑक्सीकारक। MnO4⁻ का मान सर्वाधिक (+1.51 V) है, अतः यह सबसे प्रबल ऑक्सीकारक है।

2. Q2. For a weak monobasic acid, the limiting molar conductivity is Λ°m = 400 S cm² mol⁻¹ and the molar conductivity at a given concentration is Λm = 20 S cm² mol⁻¹. The degree of dissociation of the acid at this concentration is:

   किसी दुर्बल एकक्षारकीय अम्ल के लिए, सीमांत मोलर चालकता Λ°m = 400 S cm² mol⁻¹ तथा किसी दी गई सांद्रता पर मोलर चालकता Λm = 20 S cm² mol⁻¹ है। इस सांद्रता पर अम्ल की वियोजन मात्रा (डिग्री ऑफ़ डिसोसिएशन) है:

   • A. 0.025
   • B. 0.05
   • C. 0.20
   • D. 0.50
   Solution

   For a weak electrolyte, α = Λm / Λ°m = 20/400 = 0.05, i.e. 5% dissociation.

   किसी दुर्बल विद्युत अपघट्य के लिए, α = Λm / Λ°m = 20/400 = 0.05, अर्थात् 5% वियोजन।

3. Q3. The value of the Faraday constant, representing the charge carried by one mole of electrons, is closest to:

   फैराडे स्थिरांक का मान, जो एक मोल इलेक्ट्रॉनों द्वारा वहन किए गए आवेश को निरूपित करता है, निकटतम रूप से है:

   • A. 96485 C mol⁻¹
   • B. 6.022 × 10²³ C mol⁻¹
   • C. 1.602 × 10⁻¹⁹ C mol⁻¹
   • D. 9648.5 C mol⁻¹
   Solution

   The Faraday constant is the product of the Avogadro number and the elementary charge, equal to about 96485 C mol⁻¹ (commonly rounded to 96500 C mol⁻¹).

   फैराडे स्थिरांक, एवोगैड्रो संख्या तथा मूल आवेश का गुणनफल है, जो लगभग 96485 C mol⁻¹ के बराबर है (सामान्यतः 96500 C mol⁻¹ तक पूर्णांकित किया जाता है)।

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