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Question (1)

QN00921

When magnesium ribbon burns in air, it produces a:

(A) Green flame
(B) Yellow flame
(C) Dazzling white flame
(D) Blue flame

Correct Answer: C

Explanation:

Magnesium burns with a dazzling white flame.

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Question (2)

QN00922

The white powder formed after burning magnesium ribbon is:

(A) Magnesium chloride
(B) Magnesium sulfate
(C) Magnesium oxide
(D) Magnesium nitrate

Correct Answer: C

Explanation:

Magnesium reacts with oxygen to form magnesium oxide.

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Question (3)

QN00923

Magnesium oxide is formed due to the reaction between magnesium and:

(A) Hydrogen
(B) Nitrogen
(C) Oxygen
(D) Carbon dioxide

Correct Answer: C

Explanation:

Magnesium combines with oxygen during burning.

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Question (4)

QN00924

Before burning, magnesium ribbon is cleaned using sandpaper mainly to:

(A) Increase its weight
(B) Remove impurities from its surface
(C) Make it softer
(D) Change its colour

Correct Answer: B

Explanation:

Sandpaper removes the oxide layer from magnesium ribbon.

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Question (5)

QN00925

Magnesium ribbon is held with tongs during burning because:

(A) It becomes magnetic
(B) It becomes extremely cold
(C) It becomes very hot
(D) It dissolves in air

Correct Answer: C

Explanation:

Burning magnesium becomes extremely hot.

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Question (6)

QN00926

Which apparatus is used to safely hold magnesium ribbon while heating?

(A) Dropper
(B) Watch glass
(C) Tongs
(D) Funnel

Correct Answer: C

Explanation:

Tongs are used for holding hot substances safely.

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Question (7)

QN00927

The solution formed after adding water to magnesium oxide is:

(A) Acidic
(B) Neutral
(C) Basic
(D) Colourless

Correct Answer: C

Explanation:

Magnesium oxide forms a basic solution in water.

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Question (8)

QN00928

Magnesium oxide solution changes red litmus paper to:

(A) Blue
(B) Green
(C) Red
(D) Yellow

Correct Answer: A

Explanation:

Basic solutions turn red litmus blue.

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Question (9)

QN00929

Oxides of metals are generally:

(A) Acidic
(B) Neutral
(C) Basic
(D) Colourless

Correct Answer: C

Explanation:

Most metal oxides are basic in nature.

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Question (10)

QN00930

Which observation correctly indicates that magnesium oxide solution is basic?

(A) Blue litmus turns red
(B) Red litmus turns blue
(C) Both litmus papers remain unchanged
(D) Red litmus disappears

Correct Answer: B

Explanation:

Basic substances turn red litmus blue.

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Question (1)

When magnesium ribbon burns in air, it produces a:

Explanation:

Link:

Question (2)

The white powder formed after burning magnesium ribbon is:

Explanation:

Link:

Question (3)

Magnesium oxide is formed due to the reaction between magnesium and:

Explanation:

Link:

Question (4)

Before burning, magnesium ribbon is cleaned using sandpaper mainly to:

Explanation:

Link:

Question (5)

Magnesium ribbon is held with tongs during burning because:

Explanation:

Link:

Question (6)

Which apparatus is used to safely hold magnesium ribbon while heating?

Explanation:

Link:

Question (7)

The solution formed after adding water to magnesium oxide is:

Explanation:

Link:

Question (8)

Magnesium oxide solution changes red litmus paper to:

Explanation:

Link:

Question (9)

Oxides of metals are generally:

Explanation:

Link:

Question (10)

Which observation correctly indicates that magnesium oxide solution is basic?

Explanation:

Link:

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