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JEE Main Redox & Electrochemistry — practice questions

Explore 30 free Redox & Electrochemistry questions in JEE Main Chemistry. Open each question or exercise to read its content, reference answers and available explanation.

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Redox & Electrochemistry questions and exercises with answers

Showing questions 1–30 of 30.

Originally, oxidation described the addition of which element?Read the answer and worked solution →Dioxygen makes up roughly what share of the atmosphere?Read the answer and worked solution →Elements commonly occur on earth as their oxides chiefly because of:Read the answer and worked solution →Burning magnesium in oxygen is an example of the element being:Read the answer and worked solution →Burning sulphur in oxygen counts as oxidation because oxygen is:Read the answer and worked solution →Methane burning in oxygen is oxidised owing to the addition of:Read the answer and worked solution →Looking at methane's combustion, chemists reinterpreted oxidation as removal of:Read the answer and worked solution →The early definition of oxidation by oxygen addition is described as:Read the answer and worked solution →Redox reactions are described in terms of the transfer of:Read the answer and worked solution →The modern view treats oxidation and reduction as reactions of:Read the answer and worked solution →Oxidation number denotes the oxidation state of an element in a:Read the answer and worked solution →Oxidation numbers are assigned according to a set of:Read the answer and worked solution →Disproportionation reactions are a special type of:Read the answer and worked solution →In disproportionation, one element in one oxidation state is simultaneously oxidised and:Read the answer and worked solution →A substance undergoing disproportionation must contain an element with at least how many oxidation states?Read the answer and worked solution →In disproportionation, the element in the reacting substance is in a state that is:Read the answer and worked solution →Redox reactions are involved in phenomena that are physical and also:Read the answer and worked solution →Magnesium and sulphur burning in oxygen illustrate oxidation by the definition that is:Read the answer and worked solution →Which is a redox reaction according to the electron transfer view?Read the answer and worked solution →The classical definition of oxidation looked at oxygen and:Read the answer and worked solution →Oxidation number and oxidation state are terms that are:Read the answer and worked solution →Reduction, in the classical sense, is the reverse of:Read the answer and worked solution →True or false on redox reactionsRead the answer and worked solution →Quick picks on redox reactionsRead the answer and worked solution →Match each idea to its meaningRead the answer and worked solution →Oxidised or not oxidisedRead the answer and worked solution →Old view or modern viewRead the answer and worked solution →How the idea of oxidation grewRead the answer and worked solution →Fill the gaps on redox reactionsRead the answer and worked solution →Spot the one that does not fitRead the answer and worked solution →

Worked practice questions

Originally, oxidation described the addition of which element?

  1. Oxygen
  2. Hydrogen
  3. Nitrogen
  4. Chlorine
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Correct answer: A. Oxygen

1. The word oxidation comes from the element involved. 2. Early chemists watched substances combine with air. 3. So oxidation first meant the addition of oxygen. _Source: syllabus Chemistry Part II, Unit 8, Redox Reactions._

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Dioxygen makes up roughly what share of the atmosphere?

  1. About 80 per cent
  2. About 20 per cent
  3. About 40 per cent
  4. About 60 per cent
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Correct answer: B. About 20 per cent

1. Air contains a fixed share of oxygen gas. 2. That share is enough for many elements to combine with it. 3. It is about 20 per cent. _Source: syllabus Chemistry Part II, Unit 8, Redox Reactions._

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Elements commonly occur on earth as their oxides chiefly because of:

  1. Oxygen in the air
  2. Currents in the sea
  3. Heat from volcanoes
  4. Light from the sun
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Correct answer: A. Oxygen in the air

1. Many elements react with the oxygen in the air. 2. Over time they end up combined with it. 3. So atmospheric dioxygen is the principal reason. _Source: syllabus Chemistry Part II, Unit 8, Redox Reactions._

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More Chemistry topics

Aldehydes, Ketones and Carboxylic AcidsElectrochemistryStructure of AtomThe d- and f-Block Elements & Coordination CompoundsSolutionsRedox ReactionsUnit 2B1: Transition Metals & Coordination CompoundsChemical Kinetics