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14 Oxidation & Reduction MCQ3

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Questions and Answers

What is the defining characteristic of an oxidising agent?

It remains neutral

It loses electrons

It is always a metal

It gains electrons (correct)

What is the purpose of adding dilute HCl in the test for sulfites?

To oxidise the sulphite to sulfate

To form a white precipitate

To reduce the sulphite to sulphur

To dissolve the white precipitate (correct)

What is the colour of the final product when chlorine water is added to potassium iodide solution?

Colourless

Red-Brown (correct)

Green

Orange

Which of the following is NOT a common oxidising agent?

Sodium Chloride Signup and view all the answers

What is the purpose of adding BaCl₂ in the test for sulfites?

To form a white precipitate Signup and view all the answers

What is the defining characteristic of a reducing agent?

It loses electrons Signup and view all the answers

What is the test for Fe²⁺ to ensure no Fe³⁺ is present?

Add 10 drops of NaOH to the solution Signup and view all the answers

What is the conclusion if a brown ring is formed near the bottom of the test tube when Iron II sulphate and concentrated sulphuric acid are added?

The solution contains nitrate ions Signup and view all the answers

What is the purpose of adding NaOH to the solution in the test for Fe 3+ ions?

To form a precipitate with Fe 3+ Signup and view all the answers

What is the significance of the white precipitate that dissolves in ammonia when testing for chloride ions?

The presence of chloride ions Signup and view all the answers

What is the result of adding magnesium sulfate to a solution containing carbonate ions?

A white precipitate is formed Signup and view all the answers

What is the purpose of adding dilute HCl when testing for sulfite ions?

To dissolve the precipitate formed Signup and view all the answers