NEET UG Solutions, Electrochemistry & Kinetics: Electrochemistry – Chapter Test

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Difficulty: 10 medium · 10 hard

Electrochemistry MCQ questions with answers

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

1. Q1. At 298 K, the factor 2.303RT/F that appears in the Nernst equation has the value:

   298 K पर, नर्न्स्ट समीकरण में आने वाले गुणक 2.303RT/F का मान होता है:

   • A. 0.0257 V
   • B. 0.0296 V
   • C. 0.0591 V
   • D. 0.1182 V
   Solution

   With R = 8.314 J K⁻¹ mol⁻¹, T = 298 K and F = 96485 C mol⁻¹, 2.303RT/F = 0.0591 V. (RT/F alone is about 0.0257 V, which is a common distractor.)

   R = 8.314 J K⁻¹ mol⁻¹, T = 298 K तथा F = 96485 C mol⁻¹ लेने पर, 2.303RT/F = 0.0591 V। (केवल RT/F का मान लगभग 0.0257 V होता है, जो एक सामान्य भ्रामक विकल्प है।)

2. Q2. Arrange the following electrode systems in increasing order of their standard reduction potential: Li⁺/Li, Mg²⁺/Mg, Zn²⁺/Zn, Ag⁺/Ag. The correct order is:

   निम्नलिखित इलेक्ट्रोड निकायों को उनके मानक अपचयन विभव के बढ़ते क्रम में व्यवस्थित कीजिए: Li⁺/Li, Mg²⁺/Mg, Zn²⁺/Zn, Ag⁺/Ag। सही क्रम है:

   • A. Mg²⁺/Mg < Li⁺/Li < Zn²⁺/Zn < Ag⁺/Ag
   • B. Ag⁺/Ag < Zn²⁺/Zn < Mg²⁺/Mg < Li⁺/Li
   • C. Li⁺/Li < Mg²⁺/Mg < Zn²⁺/Zn < Ag⁺/Ag
   • D. Li⁺/Li < Zn²⁺/Zn < Mg²⁺/Mg < Ag⁺/Ag
   Solution

   Standard reduction potentials are Li⁺/Li (−3.04 V) < Mg²⁺/Mg (−2.37 V) < Zn²⁺/Zn (−0.76 V) < Ag⁺/Ag (+0.80 V).

   मानक अपचयन विभव हैं Li⁺/Li (−3.04 V) < Mg²⁺/Mg (−2.37 V) < Zn²⁺/Zn (−0.76 V) < Ag⁺/Ag (+0.80 V)।

3. Q3. Which of the following is NOT a strong electrolyte?

   निम्नलिखित में से कौन-सा प्रबल विद्युत्-अपघट्य नहीं है?

   • A. NH₄OH
   • B. NaCl
   • C. KCl
   • D. HNO₃
   Solution

   NaCl, KCl and HNO₃ are strong electrolytes (essentially fully dissociated), whereas NH₄OH is a weak base that is only partially ionised.

   NaCl, KCl और HNO₃ प्रबल विद्युत्-अपघट्य हैं (लगभग पूर्णतः वियोजित), जबकि NH₄OH एक दुर्बल क्षार है जो केवल आंशिक रूप से आयनित होता है।

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