14 Oxidation & Reduction Reactions SAQ2

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Questions and Answers

What is the definition of oxidation?

Oxidation is the loss of electrons

What is the purpose of an oxidising agent in a chemical reaction?

An oxidising agent is a substance that allows oxidation to happen by gaining electrons itself.

What is the role of a reducing agent in a chemical reaction?

A reducing agent is a substance that allows reduction to happen by losing electrons itself.

What is the reaction between chlorine and sulphite solution, and what is the result of this reaction?

The reaction between chlorine and sulphite solution is the oxidation of sulphite to sulfate, resulting in the formation of a white precipitate. Signup and view all the answers

How can you test for sulfites in a solution, and what is the result of this test?

To test for sulfites, add BaCl₂ to the solution, and if a white precipitate forms, it indicates the presence of sulfites. Adding dilute HCl will then dissolve the precipitate. Signup and view all the answers

What is the indicator of the presence of Fe 2+ ions?

Red - Brown colour Signup and view all the answers

What is the difference between a sulphite and a sulfate?

A sulphite is a molecule that contains the sulphite ion (SO₃²⁻), while a sulfate is a molecule that contains the sulfate ion (SO₄²⁻). Signup and view all the answers

How can you test for Fe²⁺ ions in a solution, and what is the result of this test?

To test for Fe²⁺ ions, add 10 drops of NaOH to the solution, and if a green precipitate forms, it indicates the presence of Fe²⁺ ions. Signup and view all the answers

What is the process that occurs when chlorine is added to a Fe(II) solution?

Oxidation Signup and view all the answers

What is the test to detect the presence of Fe 3+ ions?

Add 10 drops of NaOH, and an orange-brown ppc indicates the presence of Fe 3+ ions Signup and view all the answers

What is the test to detect the presence of nitrate ions?

Add Iron II sulphate and 5 drops of concentrated sulphuric acid, and a brown ring forms near the bottom of the test tube Signup and view all the answers