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Nagaland Board Class 12 (NBSE) Electrochemistry — practice questions

Explore 30 free Electrochemistry questions in Nagaland Board Class 12 (NBSE) Chemistry. Open each question or exercise to read its content, reference answers and available explanation.

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Electrochemistry questions and exercises with answers

Showing questions 1–30 of 30.

The oxidation number of an atom in a pure element such as copper metal is:Read the answer and worked solution →In sodium chloride, the oxidation numbers of sodium and chlorine are:Read the answer and worked solution →In water, the oxidation numbers of oxygen and hydrogen are:Read the answer and worked solution →In carbon tetrachloride, the oxidation number of carbon works out to:Read the answer and worked solution →A reaction in which an element's oxidation number decreases shows that it has undergone:Read the answer and worked solution →A cell that produces electricity from a spontaneous redox reaction is called a:Read the answer and worked solution →In any electrochemical cell, oxidation always takes place at the:Read the answer and worked solution →In any electrochemical cell, reduction always takes place at the:Read the answer and worked solution →Without a salt bridge joining the two half cells, the circuit would be:Read the answer and worked solution →The salt bridge keeps each half cell electrically neutral by allowing a flow of:Read the answer and worked solution →Platinum is often chosen for an electrode when it must not react. Such an electrode is:Read the answer and worked solution →An electrode made from a metal that is itself part of the redox couple is called:Read the answer and worked solution →A single half cell potential cannot be measured alone. It is always measured:Read the answer and worked solution →Of two half cells, the stronger oxidising agent is the one with the greater:Read the answer and worked solution →The charge carried by one mole of electrons, about 96,485 coulombs, is called:Read the answer and worked solution →The equation used to find a cell potential away from standard conditions is the:Read the answer and worked solution →A cell whose two half cells differ only in concentration is called a:Read the answer and worked solution →Dry cells connected in series give a battery with a greater:Read the answer and worked solution →A hydrogen fuel cell reacts hydrogen with oxygen from the air to produce electricity and:Read the answer and worked solution →The degradation of metals by a natural electrochemical process is called:Read the answer and worked solution →Attaching a more active metal to protect iron from rusting is called:Read the answer and worked solution →Depositing a thin layer of one metal on a conducting surface using an electrolytic cell is:Read the answer and worked solution →Catch the cell partsRead the answer and worked solution →Pop the corrosion examplesRead the answer and worked solution →Run the redox gatesRead the answer and worked solution →Slice the electrochemistry termsRead the answer and worked solution →Spontaneous or drivenRead the answer and worked solution →Sort the electrochemistry ideasRead the answer and worked solution →Type the numberRead the answer and worked solution →Electrochemistry bingoRead the answer and worked solution →

Worked practice questions

The oxidation number of an atom in a pure element such as copper metal is:

  1. 0
  2. 1
  3. 2
  4. 3
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Correct answer: A. 0

1. A free element has no charge imbalance. 2. Its atoms share electrons equally or stand alone. 3. So the oxidation number is 0. _Source: OpenStax Chemistry 2e, Chapter 17, Electrochemistry._

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In sodium chloride, the oxidation numbers of sodium and chlorine are:

  1. Plus 1 and minus 2
  2. Plus 1 and minus 1
  3. Plus 2 and minus 2
  4. Minus 1 and plus 1
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Correct answer: B. Plus 1 and minus 1

1. Sodium forms a cation and chlorine an anion. 2. Each carries a single charge. 3. So they are plus 1 and minus 1. _Source: OpenStax Chemistry 2e, Chapter 17, Electrochemistry._

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In water, the oxidation numbers of oxygen and hydrogen are:

  1. Minus 2 and plus 1
  2. Minus 1 and plus 2
  3. Plus 2 and minus 1
  4. Plus 1 and minus 2
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Correct answer: A. Minus 2 and plus 1

1. Oxygen is the more electronegative atom. 2. Two hydrogens balance one oxygen. 3. So they are minus 2 and plus 1. _Source: OpenStax Chemistry 2e, Chapter 17, Electrochemistry._

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