13 Questions
What is the fundamental difference between oxidation and reduction in terms of electron gain or loss?
Oxidation is the loss of electrons, while reduction is the gain of electrons.
What is the role 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 purpose of adding BaCl₂ to a sulphite solution, and what is the expected observation?
To test for sulphites, and a white precipitate is expected to form.
Why is chlorine considered a reducing agent, and what is the reaction that occurs when chlorine is added to a sulphite solution?
Chlorine is a reducing agent because it allows reduction to happen by losing electrons itself, and when added to a sulphite solution, it oxidises the sulphite to sulfate.
What is the purpose of adding dilute HCl to a sulphite solution that has formed a white precipitate with BaCl₂, and what is the expected observation?
To dissolve the white precipitate, and the expected observation is that the white precipitate dissolves.
What is the purpose of the test for Fe²⁺, and what is the expected observation when 10 drops of NaOH are added to a solution containing Fe²⁺?
The purpose of the test is to ensure that no Fe³⁺ is present, and the expected observation is the formation of a green precipitate.
What is the common characteristic of all halogens, and what is the reaction that occurs when chlorine water is added to potassium iodide solution?
All halogens are reducing agents, and when chlorine water is added to potassium iodide solution, it oxidises the iodide to liberate iodine, which turns the solution from colourless to red-brown.
What is the colour of the precipitate formed when chlorine is added to a Fe(II) solution?
Red-Brown
What is the result of adding Iron II sulphate and 5 drops of concentrated sulphuric acid to a solution in the test for nitrates?
A brown ring formed near the bottom of the test tube
What is the effect of adding ammonia to a solution containing chloride ions?
The precipitate dissolves
What is the result of adding magnesium sulfate to a solution containing carbonate ions?
A white precipitate is formed
What is the purpose of boiling gently a solution containing hydrogencarbonate ions?
A yellow precipitate is formed
What is the mnemonic device commonly used to remember the oxidation and reduction?
OILRIG
Learn about oxidation and reduction reactions, including the gain and loss of electrons, oxidizing agents, and common examples such as oxygen, potassium permanganate, and sodium dichromate. Understand the concepts and applications of oxidation and reduction reactions.
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