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Question (1)

QN00961

Which metal is stored in kerosene because it reacts vigorously with air and water?

(A) Iron
(B) Copper
(C) Sodium
(D) Aluminium

Correct Answer: C

Explanation:

Sodium is highly reactive and is stored in kerosene.

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Question (2)

QN00962

Sodium is classified as a highly:

(A) Unreactive metal
(B) Reactive metal
(C) Brittle non-metal
(D) Neutral substance

Correct Answer: B

Explanation:

Sodium reacts vigorously with air and water.

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Question (3)

QN00963

What is the main purpose of storing sodium under kerosene?

(A) To increase its shine
(B) To prevent contact with air and moisture
(C) To cool the metal
(D) To reduce its weight

Correct Answer: B

Explanation:

Kerosene prevents sodium from reacting with air and water.

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Question (4)

QN00964

Sodium reacts vigorously with water to produce:

(A) Oxygen gas only
(B) Hydrogen gas and heat
(C) Nitrogen gas only
(D) Sulfur dioxide gas

Correct Answer: B

Explanation:

Sodium reacts with water releasing hydrogen gas and heat.

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Question (5)

QN00965

Which property of sodium makes it dangerous to keep in open air?

(A) It melts quickly in sunlight
(B) It reacts rapidly with oxygen and moisture
(C) It dissolves completely in water
(D) It becomes brittle in air

Correct Answer: B

Explanation:

Sodium reacts very quickly with air and moisture.

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Question (6)

QN00966

Which metal can catch fire when exposed to moist air?

(A) Copper
(B) Sodium
(C) Iron
(D) Zinc

Correct Answer: B

Explanation:

Sodium may catch fire due to its high reactivity.

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Question (7)

QN00967

The heat produced during the reaction of sodium with water is sufficient to:

(A) Freeze water
(B) Melt glass
(C) Ignite hydrogen gas
(D) Stop the reaction

Correct Answer: C

Explanation:

The heat produced ignites hydrogen gas.

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Question (8)

QN00968

Which statement best explains why sodium behaves differently from iron in air?

(A) Sodium is less reactive than iron
(B) Sodium reacts much faster with air and moisture
(C) Iron dissolves in air
(D) Iron is a non-metal

Correct Answer: B

Explanation:

Sodium is much more reactive than iron.

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Question (9)

QN00969

Which of the following substances behaves differently from most metals in water?

(A) Sodium
(B) Copper
(C) Aluminium
(D) Iron

Correct Answer: A

Explanation:

Sodium reacts vigorously with water.

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Question (10)

QN00970

Why should sodium not be touched directly with wet hands?

(A) It becomes soft
(B) It reacts with moisture on the skin
(C) It changes colour
(D) It dissolves instantly

Correct Answer: B

Explanation:

Moisture on the skin can react with sodium.

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Question (1)

Which metal is stored in kerosene because it reacts vigorously with air and water?

Explanation:

Link:

Question (2)

Sodium is classified as a highly:

Explanation:

Link:

Question (3)

What is the main purpose of storing sodium under kerosene?

Explanation:

Link:

Question (4)

Sodium reacts vigorously with water to produce:

Explanation:

Link:

Question (5)

Which property of sodium makes it dangerous to keep in open air?

Explanation:

Link:

Question (6)

Which metal can catch fire when exposed to moist air?

Explanation:

Link:

Question (7)

The heat produced during the reaction of sodium with water is sufficient to:

Explanation:

Link:

Question (8)

Which statement best explains why sodium behaves differently from iron in air?

Explanation:

Link:

Question (9)

Which of the following substances behaves differently from most metals in water?

Explanation:

Link:

Question (10)

Why should sodium not be touched directly with wet hands?

Explanation:

Link:

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