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Question (1)

QN0029793

A student keeps four iron nails under different conditions. Which nail will rust the fastest?

(A) Nail kept in dry air
(B) Nail dipped completely in boiled water covered with oil
(C) Nail exposed to moist air
(D) Nail kept in a vacuum flask

Correct Answer: C

Explanation:

Rusting occurs rapidly in the presence of both air and water.

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Question (2)

QN0029794

Which of the following pairs correctly matches the substance with its use?

(A) Chlorine — jewellery making
(B) Nitrogen — water purification
(C) Iodine — antiseptic
(D) Sulfur — electrical wiring

Correct Answer: C

Explanation:

Iodine solution is commonly used on wounds.

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Question (3)

QN0029795

Magnesium ribbon burns with a dazzling white flame because it reacts with:

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

Correct Answer: B

Explanation:

Burning magnesium combines with oxygen to form magnesium oxide.

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Question (4)

QN0029796

A student adds water to magnesium oxide and tests the solution with red litmus paper. What will happen?

(A) It turns blue
(B) It remains red
(C) It turns green
(D) It becomes colourless

Correct Answer: A

Explanation:

Magnesium oxide solution is basic in nature.

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Question (5)

QN0029797

Which metal among the following requires storage in kerosene?

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

Correct Answer: C

Explanation:

Sodium reacts vigorously with air and moisture.

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Question (6)

QN0029798

Which condition is necessary for rusting of iron?

(A) Only oxygen
(B) Only water
(C) Moist air
(D) Carbon dioxide only

Correct Answer: C

Explanation:

Rusting requires both air and water.

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Question (7)

QN0029799

A metal oxide turns red litmus blue. The oxide is most likely:

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

Correct Answer: B

Explanation:

Metal oxides are generally basic.

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Question (8)

QN0029800

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

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

Correct Answer: C

Explanation:

Oxygen is required for breathing and energy release.

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Question (9)

QN0029801

A student burns sulfur and dissolves the gas produced in water. Which result confirms the acidic nature of the solution?

(A) Red litmus turns blue
(B) Blue litmus turns red
(C) No colour change occurs
(D) Solution becomes green

Correct Answer: B

Explanation:

Sulfur dioxide forms an acidic solution in water.

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Question (10)

QN0029802

Which of the following statements is correct about non-metals?

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

Correct Answer: C

Explanation:

Most non-metals are poor conductors.

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Question (1)

A student keeps four iron nails under different conditions. Which nail will rust the fastest?

Explanation:

Link:

Question (2)

Which of the following pairs correctly matches the substance with its use?

Explanation:

Link:

Question (3)

Magnesium ribbon burns with a dazzling white flame because it reacts with:

Explanation:

Link:

Question (4)

A student adds water to magnesium oxide and tests the solution with red litmus paper. What will happen?

Explanation:

Link:

Question (5)

Which metal among the following requires storage in kerosene?

Explanation:

Link:

Question (6)

Which condition is necessary for rusting of iron?

Explanation:

Link:

Question (7)

A metal oxide turns red litmus blue. The oxide is most likely:

Explanation:

Link:

Question (8)

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

Explanation:

Link:

Question (9)

A student burns sulfur and dissolves the gas produced in water. Which result confirms the acidic nature of the solution?

Explanation:

Link:

Question (10)

Which of the following statements is correct about non-metals?

Explanation:

Link:

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