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Nagaland Board Class 12 (NBSE) — free MCQ practice

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Nagaland Board Class 12 (NBSE) subjects

Chemistry (30)

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ChemistryClass 12 ChemistryElectrochemistry

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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 →

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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