True-False [Che-1M]

Question 11 Mark

State whether the following statements are true or false:
Alcohol can be separated from a mixture of alcohol and water by a separating funnel.

Answer

False.

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Question 21 Mark

Sea water is a mixture.

Answer

True.
Explanation:
Sea water is a homogeneous mixture of water and many soluble salts of sodium, calcium, magnesium, potassium etc. Sodium chloride is the largest component among the salts in sea water.

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Question 31 Mark

State whether the following statement is true or false:

Milk is a pure substance.

Answer

False.

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Question 41 Mark

Name one pair of liquids which can be separated by using a separating funnel.

Answer

Kerosene and water.

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Question 51 Mark

Gases can be liquified at low temperature and low pressure.

Answer

False.
Explanation:
Gas cannot be liquefied by compression unless its temperature is below the critical value when it will be considered a vapour. Similarly, cooling will liquefy a gas only if the pressure is above the critical. Conversely, a liquid will boil at low pressure even with temperature held constant.

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Question 61 Mark

State whether the following statements are true or false:

Bread is an example of solid foam.

Sponge is an example of solid sol.

What type of colloids are bread and sponge?

Answer

True.
False.

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Science True-False [Che-1M]

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