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Question (21)

QN002691

A mixture of gas and liquid is

(A) seawater
(B) sand in water
(C) oxygen dissolved in water
(D) baking powder

Correct Answer: C

Explanation:

Oxygen dissolved in water is a gas-liquid mixture.

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Question (22)

QN002692

Which of the following is a solid–gas mixture?

(A) Carbon particles in air
(B) Seawater
(C) Vinegar
(D) Air

Correct Answer: A

Explanation:

Carbon particles are solids suspended in air.

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Question (23)

QN002693

Oil and water form a

(A) uniform mixture
(B) non-uniform mixture
(C) compound
(D) pure substance

Correct Answer: B

Explanation:

Oil and water form separate layers.

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Question (24)

QN002694

Seawater is classified as a

(A) solid-solid mixture
(B) gas-liquid mixture
(C) solid-liquid mixture
(D) gas-gas mixture

Correct Answer: C

Explanation:

Salts are solids dissolved in water.

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Question (25)

QN002695

Baking powder is a mixture of baking soda and

(A) citric acid
(B) sulfur
(C) tartaric acid
(D) calcium carbonate

Correct Answer: C

Explanation:

Baking powder contains baking soda and tartaric acid.

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Question (26)

QN002696

A teacher dissolves 20 g sugar in 200 mL water. After dissolving, the sugar particles cannot be seen separately. The mixture formed is

(A) non-uniform
(B) heterogeneous
(C) uniform
(D) suspension

Correct Answer: C

Explanation:

The sugar spreads uniformly throughout the solution.

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Question (27)

QN002697

A bowl contains peanuts, raisins, and roasted grams. Which statement is correct?

(A) The mixture is uniform
(B) Components are chemically combined
(C) Components can be identified separately
(D) The mixture is a pure substance

Correct Answer: C

Explanation:

Different components are visible separately.

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Question (28)

QN002698

A student leaves a black paper sheet near an open window for 5 hours and notices tiny particles on it. This activity proves that air contains

(A) only gases
(B) invisible water only
(C) suspended dust particles
(D) oxygen only

Correct Answer: C

Explanation:

Dust particles settle on the paper from air.

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Question (29)

QN002699

Which of the following pairs represents a uniform mixture?

(A) Air and vinegar
(B) Oil-water and muddy water
(C) Sprout salad and poha
(D) Sand-water and fruit salad

Correct Answer: A

Explanation:

Both air and vinegar have evenly distributed components.

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Question (30)

QN002700

Which property remains unchanged in the components of a mixture?

(A) Colour only
(B) Chemical identity
(C) Mass only
(D) Volume only

Correct Answer: B

Explanation:

Components retain their chemical properties in a mixture.

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Question (21)

A mixture of gas and liquid is

Explanation:

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Question (22)

Which of the following is a solid–gas mixture?

Explanation:

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Question (23)

Oil and water form a

Explanation:

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Question (24)

Seawater is classified as a

Explanation:

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Question (25)

Baking powder is a mixture of baking soda and

Explanation:

Link:

Question (26)

A teacher dissolves 20 g sugar in 200 mL water. After dissolving, the sugar particles cannot be seen separately. The mixture formed is

Explanation:

Link:

Question (27)

A bowl contains peanuts, raisins, and roasted grams. Which statement is correct?

Explanation:

Link:

Question (28)

A student leaves a black paper sheet near an open window for 5 hours and notices tiny particles on it. This activity proves that air contains

Explanation:

Link:

Question (29)

Which of the following pairs represents a uniform mixture?

Explanation:

Link:

Question (30)

Which property remains unchanged in the components of a mixture?

Explanation:

Link:

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