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14 Oxidation and Reduction Reactions MCQ1

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Questions and Answers

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

To form a green precipitate
To oxidise the sulphite
To reduce the sulphite
To dissolve the white precipitate (correct)

Which of the following is NOT a common oxidising agent?

Oxygen
Sodium dichromate
Sodium chloride (correct)
Hydrogen peroxide

What is the colour of the solution when bromine water is added to potassium iodide?

Colourless
Green
Red-brown (correct)
Orange

What is the function of an oxidising agent in a reaction?

To allow oxidation to happen by gaining electrons (B) Signup and view all the answers

What is the purpose of the test for Fe2+?

To ensure no Fe3+ is present (D) Signup and view all the answers

What is the colour of the precipitate formed when BaCl₂ is added to a sulphite solution?

White (C) Signup and view all the answers

What is the colour of the precipitate formed when chlorine is added to a Fe(II) solution?

Red-Brown (D) Signup and view all the answers

What indicates the presence of Fe 3+ ions in a solution?

An orange-brown precipitate (C) Signup and view all the answers

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

Iron II sulphate and concentrated sulphuric acid (B) Signup and view all the answers

What is the result of the test for nitrate ions?

A brown ring formed near the bottom of the test tube (C) Signup and view all the answers

What is the result of adding silver nitrate to a chloride solution?

A white precipitate (A) Signup and view all the answers

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

A white precipitate (B) Signup and view all the answers

What is the result of adding ammonium molybdate to a phosphate solution?

A white precipitate (D) Signup and view all the answers

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