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Question (31)

QN00951

Which non-metal is described as the building block of all life forms?

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

Correct Answer: B

Explanation:

Carbon is essential for all living organisms.

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Question (32)

QN00952

Nitrogen is mainly used in the manufacture of:

(A) Jewellery
(B) Fertilisers
(C) Electrical wires
(D) Cooking vessels

Correct Answer: B

Explanation:

Nitrogen is used in fertiliser production.

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Question (33)

QN00953

Chlorine is commonly used in:

(A) Water purification
(B) Rust prevention
(C) Food packaging
(D) Electrical circuits

Correct Answer: A

Explanation:

Chlorine is used to purify drinking water.

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Question (34)

QN00954

A solution of iodine is commonly applied on wounds as an:

(A) Fertiliser
(B) Antiseptic
(C) Lubricant
(D) Fuel

Correct Answer: B

Explanation:

Iodine solution acts as an antiseptic.

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Question (35)

QN00955

Metals and non-metals are sub-categories of substances called:

(A) Mixtures
(B) Compounds
(C) Elements
(D) Alloys

Correct Answer: C

Explanation:

Metals and non-metals are types of elements.

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Question (36)

QN00956

An element is a substance that:

(A) Can be broken into metals only
(B) Cannot be broken down into simpler substances
(C) Is always shiny
(D) Is always gaseous

Correct Answer: B

Explanation:

Elements are pure substances.

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Question (37)

QN00957

Presently, how many elements are known?

(A) 92
(B) 100
(C) 118
(D) 150

Correct Answer: C

Explanation:

There are 118 known elements.

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Question (38)

QN00958

Which of the following materials is NOT classified as a metal or non-metal because it is not an element?

(A) Oxygen
(B) Sulfur
(C) Copper
(D) Plastic

Correct Answer: D

Explanation:

Plastic is not an element.

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Question (39)

QN00959

Which of the following is a conceptual application of acidic oxides of non-metals?

(A) Sulfur dioxide turns blue litmus red
(B) Magnesium oxide turns red litmus blue
(C) Sodium oxide remains neutral
(D) Iron rusts in dry air only

Correct Answer: A

Explanation:

Sulfur dioxide forms an acidic solution in water.

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Question (40)

QN00960

A student burns sulfur and dissolves the gas formed in water. Which result confirms the presence of an acidic solution?

(A) Red litmus turns blue
(B) Blue litmus turns red
(C) Both litmus papers remain unchanged
(D) The solution becomes metallic

Correct Answer: B

Explanation:

Acids turn blue litmus red.

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Question (31)

Which non-metal is described as the building block of all life forms?

Explanation:

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Question (32)

Nitrogen is mainly used in the manufacture of:

Explanation:

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Question (33)

Chlorine is commonly used in:

Explanation:

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Question (34)

A solution of iodine is commonly applied on wounds as an:

Explanation:

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Question (35)

Metals and non-metals are sub-categories of substances called:

Explanation:

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Question (36)

An element is a substance that:

Explanation:

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Question (37)

Presently, how many elements are known?

Explanation:

Link:

Question (38)

Which of the following materials is NOT classified as a metal or non-metal because it is not an element?

Explanation:

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Question (39)

Which of the following is a conceptual application of acidic oxides of non-metals?

Explanation:

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Question (40)

A student burns sulfur and dissolves the gas formed in water. Which result confirms the presence of an acidic solution?

Explanation:

Link:

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