When magnesium ribbon is burnt in the air, it forms __ which is _ in colour. [0.5 marks]

(a) magnesium hydroxide, black
(b) magnesium oxide, white
(c) magnesium oxide, black
(d) magnesium hydroxide, white

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Solution

Option (b), magnesium oxide, white [0.5 marks]

When magnesium ribbon is burnt in the air or in presence of oxygen, it burns with a dazzling white flame and produces magnesium oxide ( $MgO$ ) powder which is white in colour. This can be represented as:

Magnesium + Oxygen→ Magnesium oxide

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(b) magnesium hydroxide
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A magnesium ribbon is burnt in air. A student made the following observations:

i. Magnesium ribbon undergoes oxidation reaction.
ii. Magnesium reacts with air to form magnesium oxide.
iii. Magnesium ribbon undergoes decomposition reaction.

Which of the following statements is correct?

When magnesium ribbon burns in air to form magnesium oxide, it a _______ reaction.

Q. 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?

Q. Which among the following statements is incorrect for magnesium metal?

(a) It burns in oxygen with a dazzling white flame.
(b) It reacts with cold water to form magnesium oxide and evolves hydrogen gas.
(c) It reacts with hot water to form magnesium hydroxide and evolves hydrogen gas.
(d) It reacts with steam to form magnesium hydroxide and evolves hydrogen gas.

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When magnesium ribbon is burnt in the air, it forms ________ which is _______ in colour. [0.5 marks] (a) magnesium hydroxide, black (b) magnesium oxide, white (c) magnesium oxide, black (d) magnesium hydroxide, white

Option (b), magnesium oxide, white [0.5 marks] When magnesium ribbon is burnt in the air or in presence of oxygen, it burns with a dazzling white flame and produces magnesium oxide (MgO) powder which is white in colour. This can be represented as: Magnesium + Oxygen→ Magnesium oxide

When magnesium ribbon is burnt in the air, it forms __ which is _ in colour. [0.5 marks]

(a) magnesium hydroxide, black
(b) magnesium oxide, white
(c) magnesium oxide, black
(d) magnesium hydroxide, white

Option (b), magnesium oxide, white [0.5 marks]

When magnesium ribbon is burnt in the air or in presence of oxygen, it burns with a dazzling white flame and produces magnesium oxide ( $MgO$ ) powder which is white in colour. This can be represented as:

Magnesium + Oxygen→ Magnesium oxide