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Question (31)

QN00871

Magnesium ribbon burns in air with a:

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

Correct Answer: C

Explanation:

Magnesium burns with a dazzling white flame in air.

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Question (32)

QN00872

The white powder formed after burning magnesium ribbon is:

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

Correct Answer: B

Explanation:

Magnesium reacts with oxygen to form magnesium oxide.

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Question (33)

QN00873

Magnesium oxide solution turns red litmus paper:

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

Correct Answer: C

Explanation:

Magnesium oxide is basic in nature and turns red litmus blue.

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Question (34)

QN00874

Oxides of metals are generally:

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

Correct Answer: C

Explanation:

Metal oxides are generally basic in nature.

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Question (35)

QN00875

Sodium is stored in kerosene because it reacts vigorously with:

(A) Nitrogen only
(B) Oxygen and water
(C) Carbon dioxide only
(D) Wood and coal

Correct Answer: B

Explanation:

Kerosene prevents sodium from coming in contact with air and moisture.

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Question (36)

QN00876

Burning sulfur in air produces:

(A) Sulfuric acid directly
(B) Sulfur dioxide gas
(C) Oxygen gas
(D) Hydrogen gas

Correct Answer: B

Explanation:

Sulfur reacts with oxygen to form sulfur dioxide gas.

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Question (37)

QN00877

The solution formed after dissolving sulfur dioxide in water is:

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

Correct Answer: C

Explanation:

Sulfur dioxide dissolves in water to form an acidic solution.

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Question (38)

QN00878

Which statement about non-metals is correct?

(A) They are usually ductile and sonorous.
(B) They are generally poor conductors of heat and electricity.
(C) They are always lustrous.
(D) They are all hard solids.

Correct Answer: B

Explanation:

Non-metals are generally poor conductors of heat and electricity.

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Question (39)

QN00879

Chlorine is commonly used for:

(A) Making jewellery
(B) Water purification
(C) Preventing rusting
(D) Electrical wiring

Correct Answer: B

Explanation:

Chlorine is used to purify drinking water.

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Question (40)

QN00880

Which non-metal is essential for respiration in living organisms?

(A) Sulfur
(B) Carbon
(C) Oxygen
(D) Nitrogen

Correct Answer: C

Explanation:

Oxygen is necessary for respiration in living organisms.

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Question (31)

Magnesium ribbon burns in air with a:

Explanation:

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Question (32)

The white powder formed after burning magnesium ribbon is:

Explanation:

Link:

Question (33)

Magnesium oxide solution turns red litmus paper:

Explanation:

Link:

Question (34)

Oxides of metals are generally:

Explanation:

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Question (35)

Sodium is stored in kerosene because it reacts vigorously with:

Explanation:

Link:

Question (36)

Burning sulfur in air produces:

Explanation:

Link:

Question (37)

The solution formed after dissolving sulfur dioxide in water is:

Explanation:

Link:

Question (38)

Which statement about non-metals is correct?

Explanation:

Link:

Question (39)

Chlorine is commonly used for:

Explanation:

Link:

Question (40)

Which non-metal is essential for respiration in living organisms?

Explanation:

Link:

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