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Question (11)

QN00971

Which gas is commonly released when highly reactive metals react with water?

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

Correct Answer: C

Explanation:

Hydrogen gas is released during the reaction.

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Question (12)

QN00972

Phosphorus is stored in water because it:

(A) Is insoluble in water
(B) Reacts vigorously with water
(C) Catches fire easily in air
(D) Turns into a metal oxide

Correct Answer: C

Explanation:

Phosphorus catches fire easily in air.

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Question (13)

QN00973

Which non-metal shows very high reactivity with air?

(A) Sulfur
(B) Carbon
(C) Phosphorus
(D) Iodine

Correct Answer: C

Explanation:

Phosphorus is highly reactive in air.

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Question (14)

QN00974

White phosphorus catches fire in air at about:

(A) 10°C
(B) 35°C
(C) 100°C
(D) 250°C

Correct Answer: B

Explanation:

White phosphorus ignites around 35°C.

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Question (15)

QN00975

Phosphorus is stored under water mainly to:

(A) Increase its shine
(B) Reduce its density
(C) Prevent contact with air
(D) Make it harder

Correct Answer: C

Explanation:

Water prevents phosphorus from contacting air.

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Question (16)

QN00976

Which of the following can ignite spontaneously in air?

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

Correct Answer: C

Explanation:

White phosphorus ignites easily in air.

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Question (17)

QN00977

The storage methods of sodium and phosphorus are similar because both:

(A) Are non-reactive
(B) Need protection from air
(C) Dissolve rapidly in water
(D) Are poor conductors

Correct Answer: B

Explanation:

Both substances react quickly with air.

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Question (18)

QN00978

Which of the following statements is correct about white phosphorus?

(A) It is stored in kerosene.
(B) It reacts slowly with oxygen.
(C) It catches fire easily in air.
(D) It is a non-reactive gas.

Correct Answer: C

Explanation:

White phosphorus is highly reactive with oxygen.

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Question (19)

QN00979

Which metal reacts more vigorously with water than iron?

(A) Sodium
(B) Copper
(C) Gold
(D) Silver

Correct Answer: A

Explanation:

Sodium reacts much more vigorously with water than iron.

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Question (20)

QN00980

Which safety precaution is most important while handling sodium in the laboratory?

(A) Keep it in direct sunlight
(B) Store it in water
(C) Avoid contact with moisture
(D) Mix it with acids

Correct Answer: C

Explanation:

Sodium reacts dangerously with moisture.

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Question (11)

Which gas is commonly released when highly reactive metals react with water?

Explanation:

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Question (12)

Phosphorus is stored in water because it:

Explanation:

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Question (13)

Which non-metal shows very high reactivity with air?

Explanation:

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Question (14)

White phosphorus catches fire in air at about:

Explanation:

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Question (15)

Phosphorus is stored under water mainly to:

Explanation:

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Question (16)

Which of the following can ignite spontaneously in air?

Explanation:

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Question (17)

The storage methods of sodium and phosphorus are similar because both:

Explanation:

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Question (18)

Which of the following statements is correct about white phosphorus?

Explanation:

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Question (19)

Which metal reacts more vigorously with water than iron?

Explanation:

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Question (20)

Which safety precaution is most important while handling sodium in the laboratory?

Explanation:

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