JEE Main Physical Chemistry — Electrochemistry & Kinetics – Topic Test

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Difficulty: 15 medium · 15 hard

Physical Chemistry — Electrochemistry & Kinetics MCQ questions with answers

The first 3 of 30 questions. Unlock the series for the rest, each with a solution.

1. Q1. For a galvanic cell with standard EMF E°cell = 1.10 V in which 2 electrons are transferred, the standard Gibbs energy change (F = 96500 C mol⁻¹) is:

   एक गैल्वेनिक सेल, जिसका मानक EMF E°cell = 1.10 V है तथा जिसमें 2 इलेक्ट्रॉन स्थानांतरित होते हैं, के लिए मानक गिब्स ऊर्जा परिवर्तन (F = 96500 C mol⁻¹) है:

   • A. -21.23 kJ
   • B. -106.15 kJ
   • C. +212.3 kJ
   • D. -212.3 kJ
   Solution

   ΔG° = -nFE°cell = -(2)(96500)(1.10) = -212300 J = -212.3 kJ.

   ΔG° = -nFE°cell = -(2)(96500)(1.10) = -212300 J = -212.3 kJ।

2. Q2. For the reaction N₂(g) + 3H₂(g) → 2NH₃(g), the rate of disappearance of H₂ at a given instant is 0.30 mol L⁻¹ s⁻¹. The rate of formation of NH₃ at that instant is:

   अभिक्रिया N₂(g) + 3H₂(g) → 2NH₃(g) के लिए, किसी क्षण पर H₂ के विलुप्त होने की दर 0.30 mol L⁻¹ s⁻¹ है। उस क्षण पर NH₃ के बनने की दर है:

   • A. 0.20 mol L⁻¹ s⁻¹
   • B. 0.30 mol L⁻¹ s⁻¹
   • C. 0.10 mol L⁻¹ s⁻¹
   • D. 0.45 mol L⁻¹ s⁻¹
   Solution

   The rate of reaction is (−1/3)d[H₂]/dt = 0.30/3 = 0.10 mol L⁻¹ s⁻¹, and the rate of formation of NH₃ is twice this, i.e. (1/2)d[NH₃]/dt = 0.10, so d[NH₃]/dt = 0.20 mol L⁻¹ s⁻¹.

   अभिक्रिया की दर (−1/3)d[H₂]/dt = 0.30/3 = 0.10 mol L⁻¹ s⁻¹ है, और NH₃ के बनने की दर इसकी दुगुनी है, अर्थात (1/2)d[NH₃]/dt = 0.10, अतः d[NH₃]/dt = 0.20 mol L⁻¹ s⁻¹।

3. Q3. Assertion (A): Alkali metals act as strong reducing agents. Reason (R): Alkali metals have highly negative standard reduction potentials. Select the correct option.

   अभिकथन (A): क्षार धातुएँ प्रबल अपचायक के रूप में कार्य करती हैं। कारण (R): क्षार धातुओं के मानक अपचयन विभव अत्यधिक ऋणात्मक होते हैं। सही विकल्प चुनिए।

   • A. A is false but R is true / A असत्य है परन्तु R सत्य है
   • B. A is true but R is false / A सत्य है परन्तु R असत्य है
   • C. Both A and R are true but R is not the correct explanation of A / A और R दोनों सत्य हैं परन्तु R, A की सही व्याख्या नहीं है
   • D. Both A and R are true and R is the correct explanation of A / A और R दोनों सत्य हैं और R, A की सही व्याख्या है
   Solution

   A highly negative standard reduction potential means the metal is readily oxidised, i.e. it is a strong reducing agent; so both statements are true and R correctly explains A.

   अत्यधिक ऋणात्मक मानक अपचयन विभव का अर्थ है कि धातु सरलता से ऑक्सीकृत होती है, अर्थात् यह प्रबल अपचायक है; अतः दोनों कथन सत्य हैं तथा R, A की सही व्याख्या करता है।

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