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Question (11)

QN00931

Sodium is stored in kerosene because it reacts vigorously with:

(A) Carbon dioxide and nitrogen
(B) Oxygen and water
(C) Sulfur and chlorine
(D) Iron and copper

Correct Answer: B

Explanation:

Sodium reacts vigorously with air and moisture.

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Question (12)

QN00932

Storing sodium in kerosene prevents its exposure to:

(A) Heat and light
(B) Moisture and air
(C) Sand and dust
(D) Acid and base

Correct Answer: B

Explanation:

Kerosene isolates sodium from air and water.

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Question (13)

QN00933

A lot of heat is generated when sodium reacts with:

(A) Oxygen and water
(B) Sulfur and nitrogen
(C) Carbon and hydrogen
(D) Iron and zinc

Correct Answer: A

Explanation:

Sodium reacts vigorously with oxygen and water.

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Question (14)

QN00934

The oxide formed by sodium is expected to be:

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

Correct Answer: B

Explanation:

Sodium oxide is basic in nature.

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Question (15)

QN00935

Sulfur burns in air to produce:

(A) Sulfuric acid
(B) Sulfur trioxide
(C) Sulfur dioxide gas
(D) Hydrogen sulfide

Correct Answer: C

Explanation:

Sulfur reacts with oxygen to form sulfur dioxide.

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Question (16)

QN00936

Which instrument is used to heat and burn sulfur safely in the experiment?

(A) Watch glass
(B) Deflagrating spoon
(C) Measuring cylinder
(D) Thermometer

Correct Answer: B

Explanation:

A deflagrating spoon is used for burning sulfur.

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Question (17)

QN00937

The gas jar is covered with a lid after burning sulfur mainly to:

(A) Cool the gas jar
(B) Prevent gas from escaping
(C) Increase oxygen supply
(D) Reduce heat production

Correct Answer: B

Explanation:

Covering prevents sulfur dioxide gas from escaping.

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Question (18)

QN00938

Sulfur dioxide gas dissolves in water to form:

(A) Sulfuric acid
(B) Sulfurous acid
(C) Hydrochloric acid
(D) Nitric acid

Correct Answer: B

Explanation:

Sulfur dioxide forms sulfurous acid in water.

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Question (19)

QN00939

The solution obtained after dissolving sulfur dioxide in water is:

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

Correct Answer: A

Explanation:

Sulfurous acid makes the solution acidic.

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Question (20)

QN00940

Which litmus paper changes colour in sulfur dioxide solution?

(A) Red litmus turns blue
(B) Blue litmus turns red
(C) Both litmus papers turn green
(D) No change occurs

Correct Answer: B

Explanation:

Acidic solutions turn blue litmus red.

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Question (11)

Sodium is stored in kerosene because it reacts vigorously with:

Explanation:

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Question (12)

Storing sodium in kerosene prevents its exposure to:

Explanation:

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Question (13)

A lot of heat is generated when sodium reacts with:

Explanation:

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Question (14)

The oxide formed by sodium is expected to be:

Explanation:

Link:

Question (15)

Sulfur burns in air to produce:

Explanation:

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Question (16)

Which instrument is used to heat and burn sulfur safely in the experiment?

Explanation:

Link:

Question (17)

The gas jar is covered with a lid after burning sulfur mainly to:

Explanation:

Link:

Question (18)

Sulfur dioxide gas dissolves in water to form:

Explanation:

Link:

Question (19)

The solution obtained after dissolving sulfur dioxide in water is:

Explanation:

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Question (20)

Which litmus paper changes colour in sulfur dioxide solution?

Explanation:

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