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Question (1)

QN00881

Brown deposits formed on iron objects are called:

(A) Ash
(B) Rust
(C) Soot
(D) Dust

Correct Answer: B

Explanation:

Rust is the brown deposit formed on iron objects.

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Question (2)

QN00882

The process of formation of rust on iron objects is called:

(A) Condensation
(B) Corrosion
(C) Rusting
(D) Galvanisation

Correct Answer: C

Explanation:

Formation of rust on iron is called rusting.

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Question (3)

QN00883

Rusting of iron occurs in the presence of:

(A) Dry air only
(B) Water only
(C) Moist air
(D) Sunlight only

Correct Answer: C

Explanation:

Moist air provides both air and water needed for rusting.

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Question (4)

QN00884

In the rusting experiment, silica gel was placed in bottle A to:

(A) Increase temperature
(B) Keep the air dry
(C) Remove iron nail
(D) Produce rust quickly

Correct Answer: B

Explanation:

Silica gel absorbs moisture and keeps air dry.

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Question (5)

QN00885

Which condition was present in bottle A of the rusting activity?

(A) Water only
(B) Moist air only
(C) Dry air only
(D) Neither air nor water

Correct Answer: C

Explanation:

Bottle A contained dry air without water.

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Question (6)

QN00886

Why was freshly boiled and cooled water used in bottle B?

(A) To add oxygen
(B) To remove dissolved gases
(C) To cool the iron nail
(D) To make water acidic

Correct Answer: B

Explanation:

Boiling removes dissolved gases like oxygen from water.

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Question (7)

QN00887

In bottle B, oil was poured over water mainly to:

(A) Increase rusting
(B) Change water colour
(C) Prevent air from dissolving in water
(D) Heat the water

Correct Answer: C

Explanation:

Oil blocks contact between water and air.

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Question (8)

QN00888

Which bottle in the experiment allowed the iron nail to come in contact with both air and water?

(A) Bottle A
(B) Bottle B
(C) Bottle C
(D) None of these

Correct Answer: C

Explanation:

Bottle C exposed the nail to both air and water.

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Question (9)

QN00889

Rust formed on the iron nail in bottle C because:

(A) Only water was present
(B) Only air was present
(C) Both air and water were present
(D) Silica gel was present

Correct Answer: C

Explanation:

Rusting needs both air and water.

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Question (10)

QN00890

Which iron nail would show maximum rusting after several days?

(A) Nail in dry air
(B) Nail in boiled water covered with oil
(C) Nail partially dipped in water and exposed to air
(D) Nail kept in sunlight only

Correct Answer: C

Explanation:

Rusting is fastest when both air and water are present.

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Question (1)

Brown deposits formed on iron objects are called:

Explanation:

Link:

Question (2)

The process of formation of rust on iron objects is called:

Explanation:

Link:

Question (3)

Rusting of iron occurs in the presence of:

Explanation:

Link:

Question (4)

In the rusting experiment, silica gel was placed in bottle A to:

Explanation:

Link:

Question (5)

Which condition was present in bottle A of the rusting activity?

Explanation:

Link:

Question (6)

Why was freshly boiled and cooled water used in bottle B?

Explanation:

Link:

Question (7)

In bottle B, oil was poured over water mainly to:

Explanation:

Link:

Question (8)

Which bottle in the experiment allowed the iron nail to come in contact with both air and water?

Explanation:

Link:

Question (9)

Rust formed on the iron nail in bottle C because:

Explanation:

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Question (10)

Which iron nail would show maximum rusting after several days?

Explanation:

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