IGCSE Chemistry: Specimen Questions with Answers 212 - 214 of 240

Question number: 212

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Question

The following diagram shows a cup of tea.

Image of Cup of Tea

Image of Cup of Tea

Image showing the cup of tea

Which row describes the water particles in the air above the cup compared with the water particles in the cup?

Choices

Choice (4) Response

a.

Moving Faster- True, Closer together- True

b.

Moving Faster- True, Closer together- False

c.

Moving Faster- False, Closer together- True

d.

Moving Faster- False, Closer together- False

Answer

b.

Explanation

Correct option is B (move faster and not closer together) because water particles in air above the cup compared with the water particles in cup move faster and not closer together because in air vapour moves freely because force of attraction is less than force of attraction in cup.

Question number: 213

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Question

Group elements are also known as ________.

Choices

Choice (4) Response

a.

alkali metals

b.

transition elements

c.

halogens

d.

alkaline earth metals

Answer

a.

Explanation

Group 1A elements are also known as alkali metals. On reaction with water, these elements form corresponding water soluble hydroxides which are known as alkali. Thus group elements are known as alkali metals.

Question number: 214

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Question

Which of the following statements is false?

Choices

Choice (4) Response

a.

Alkali metals form their oxides when they react with water.

b.

The product that alkali metal forms when it reacts with water is basic.

c.

Alkali metals form their hydroxides when they react with water.

d.

The product that alkali metal forms when it reacts with water is soluble in water.

Answer

a.

Explanation

  • Alkali metals, on reaction with water, form their corresponding hydroxides and not oxides and the metal hydroxides thus formed are soluble in water.

  • So the statement “Alkali metals form their oxides when they react with water” is false.