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What is a redox reaction ? When a magnes...

What is a redox reaction ? When a magnesium ribbon is burnt in air, it burns with a dazzling white flame and white powder is formed. Is magnesium oxidised or reduced ? Why ?

Text Solution

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A reaction in which oxidation and reduction reactions occur simultaneously is called redox reaction.
`2Mg(s) + O_(2)(g) to 2MgO(s)`
In this reaction, magnesium combine with oxygen. Hence, it is oxidised to MgO.
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Aim: To study the burning of magnesium ribbon in air. Caution : It is necessary that this activity should be performed in the presence of a teacher. For safety purpose, teacher and student should wear goggles. Activity: Take approximately 3-4 cm long magnesium ribbon and make it clean by rubbing it with sand paper. Hold it with a pair of tongs and heat on the flame of burner or spirit lamp and the ash being formed collects in the watch-glass as shown in the figure 1.1. Collected ash in the watch-glass is of magnesium oxide. Burn the magnesium ribbon. Keeping it away as far as possible from your eyes. Which type of flame is formed during the burning of magnesium ribbon?

Aim: To study the burning of magnesium ribbon in air. Caution : It is necessary that this activity should be performed in the presence of a teacher. For safety purpose, teacher and student should wear goggles. Activity: Take approximately 3-4 cm long magnesium ribbon and make it clean by rubbing it with sand paper. Hold it with a pair of tongs and heat on the flame of burner or spirit lamp and the ash being formed collects in the watch-glass as shown in the figure 1.1. Collected ash in the watch-glass is of magnesium oxide. Burn the magnesium ribbon. Keeping it away as far as possible from your eyes. Write the chemical reaction of forming the magnesium oxide.

Aim: To study the burning of magnesium ribbon in air. Caution : It is necessary that this activity should be performed in the presence of a teacher. For safety purpose, teacher and student should wear goggles. Activity: Take approximately 3-4 cm long magnesium ribbon and make it clean by rubbing it with sand paper. Hold it with a pair of tongs and heat on the flame of burner or spirit lamp and the ash being formed collects in the watch-glass as shown in the figure 1.1. Collected ash in the watch-glass is of magnesium oxide. Burn the magnesium ribbon. Keeping it away as far as possible from your eyes. Why is magnesium ribbon selected ?

Aim: To study the burning of magnesium ribbon in air. Caution : It is necessary that this activity should be performed in the presence of a teacher. For safety purpose, teacher and student should wear goggles. Activity: Take approximately 3-4 cm long magnesium ribbon and make it clean by rubbing it with sand paper. Hold it with a pair of tongs and heat on the flame of burner or spirit lamp and the ash being formed collects in the watch-glass as shown in the figure 1.1. Collected ash in the watch-glass is of magnesium oxide. Burn the magnesium ribbon. Keeping it away as far as possible from your eyes. What is the colour of magnesium ribbon initially ?

Aim: To study the burning of magnesium ribbon in air. Caution : It is necessary that this activity should be performed in the presence of a teacher. For safety purpose, teacher and student should wear goggles. Activity: Take approximately 3-4 cm long magnesium ribbon and make it clean by rubbing it with sand paper. Hold it with a pair of tongs and heat on the flame of burner or spirit lamp and the ash being formed collects in the watch-glass as shown in the figure 1.1. Collected ash in the watch-glass is of magnesium oxide. Burn the magnesium ribbon. Keeping it away as far as possible from your eyes. What is the composition of ash collected in watch-glass ?

Write word equations and then balanced equations for the reaction taking place when…… (a)Dilute sulphuric acid reacts with zinc granules. (b)Dilute hydrochloric acid reacts with magnesium ribbon . (c )Dilute sulphuric acid reacts with aluminium powder. (d)Dilute hydrochloric acid reacts with iron filings.

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