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Reactivity Trends (Group 2)

What is a red...

Question

What is a redox reaction? When a magnesium ribbon burns in air with a dazzling flame and forms white ash, is magnesium oxidized or reduced? Why?

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Solution

The reaction in which oxidation and reduction occur simultaneously is called a redox reaction. When magnesium ribbon burns, it forms oxide. Magnesium is oxidised to its oxide.

$M g + \frac{1}{2} O_{2} ⟶ M g O$

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Q. (a) What is a redox reaction? Explain with an example.
(b) When a magnesium ribbon burns in air with a dazzling flame and forms a white ash, is magnesium oxidised or reduced? Why?
(c) In the reaction represented by the equation:

{MnO}_{2} + 4 HCl \underset{}{\to} {MnCl}_{2} + 2 H_{2} O + {Cl}_{2}

(i) name the substance oxidised.
(ii) name the oxidising agent.
(iii) name the substance reduced.
(iv) name the reducing agent.

Q. Statement 1: Magnesium burns in air with a dazzling white flame forming metal oxide.
Statement 2: Metals on reaction with water produce metal oxide along with oxygen.

Statement 1: Magnesium burns in air with a dazzling white flame.
Statement 2: Metal + Water $\to$ Metal oxide + Hydrogen

Q. When magnesium ribbon burns in the air, it forms white ash. The chemical name of white ash is:

Q. When a burning magnesium ribbon is introduced in a gas jar containing oxygen, it will burn with :
(1) a reddish flame
(2) a pale blue flame
(3) a golden yellow flame
(4) a dazzling white flame

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