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Question (31)

QN00991

Which statement correctly compares sodium and phosphorus?

(A) Both are stored under kerosene.
(B) Both react vigorously with air.
(C) Both are non-metals.
(D) Both are poor conductors of heat.

Correct Answer: B

Explanation:

Both substances are highly reactive with air.

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Question (32)

QN00992

What makes phosphorus different from sulfur in air?

(A) Phosphorus ignites easily in air.
(B) Sulfur reacts faster than phosphorus.
(C) Sulfur is stored under water.
(D) Phosphorus is a metal.

Correct Answer: A

Explanation:

Phosphorus catches fire easily in air.

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Question (33)

QN00993

Which condition is safest for storing white phosphorus?

(A) In open air
(B) Under water
(C) In sunlight
(D) In dry sand

Correct Answer: B

Explanation:

Water prevents phosphorus from reacting with air.

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Question (34)

QN00994

Which of the following metals does not require storage in kerosene?

(A) Sodium
(B) Potassium
(C) Iron
(D) Lithium

Correct Answer: C

Explanation:

Iron is comparatively less reactive.

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Question (35)

QN00995

A student accidentally leaves sodium exposed to moist air. What is most likely to happen?

(A) Sodium remains unchanged
(B) Sodium reacts vigorously
(C) Sodium becomes brittle
(D) Sodium freezes

Correct Answer: B

Explanation:

Sodium reacts rapidly with moisture in air.

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Question (36)

QN00996

Which statement explains why sodium and phosphorus are examples of substances behaving differently in air and water?

(A) They are unreactive substances.
(B) They require ordinary storage methods.
(C) They show unusually high reactivity.
(D) They are mixtures of metals and non-metals.

Correct Answer: C

Explanation:

Both substances are highly reactive.

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Question (37)

QN00997

Which of the following substances needs maximum protection from oxygen in air?

(A) Copper
(B) Iron
(C) White phosphorus
(D) Aluminium

Correct Answer: C

Explanation:

White phosphorus ignites easily in oxygen.

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Question (38)

QN00998

Which pair contains substances that are stored differently due to their reactivity?

(A) Iron and copper
(B) Sodium and phosphorus
(C) Aluminium and zinc
(D) Silver and gold

Correct Answer: B

Explanation:

Sodium and phosphorus require special storage methods.

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Question (39)

QN00999

The reaction of sodium with water demonstrates that some metals can be:

(A) Completely non-reactive
(B) Highly reactive with water
(C) Acidic in nature
(D) Poor conductors of heat

Correct Answer: B

Explanation:

Some metals react vigorously with water.

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Question (40)

QN001000

Which conclusion can be drawn from the special storage methods of sodium and phosphorus?

(A) Reactive substances require careful handling and storage.
(B) All metals react violently with water.
(C) All non-metals are stored under water.
(D) Kerosene reacts with all metals.

Correct Answer: A

Explanation:

Highly reactive substances need special safety measures.

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Question (31)

Which statement correctly compares sodium and phosphorus?

Explanation:

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Question (32)

What makes phosphorus different from sulfur in air?

Explanation:

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Question (33)

Which condition is safest for storing white phosphorus?

Explanation:

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Question (34)

Which of the following metals does not require storage in kerosene?

Explanation:

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Question (35)

A student accidentally leaves sodium exposed to moist air. What is most likely to happen?

Explanation:

Link:

Question (36)

Which statement explains why sodium and phosphorus are examples of substances behaving differently in air and water?

Explanation:

Link:

Question (37)

Which of the following substances needs maximum protection from oxygen in air?

Explanation:

Link:

Question (38)

Which pair contains substances that are stored differently due to their reactivity?

Explanation:

Link:

Question (39)

The reaction of sodium with water demonstrates that some metals can be:

Explanation:

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Question (40)

Which conclusion can be drawn from the special storage methods of sodium and phosphorus?

Explanation:

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