IGCSE Chemistry: Specimen Questions with Answers 213 - 215 of 240

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Question 213

Question

MCQ▾

Group elements are also known as … .

Choices

Choice (4)

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 214

Question

MCQ▾

Which of the following statements is false?

Choices

Choice (4)

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.

Question 215

Question

MCQ▾

Fluorine is at the top of Group VII in the Periodic Table.

Which row shows the properties of fluorine?

Choices

Choice (4)

a.

Table Showing Properties of Fluorine: Choice A

b.

Table Showing Properties of Fluorine: Choice B

c.

Table Showing Properties of Fluorine: Choice C

d.

Table Showing Properties of Fluorine: Choice D

Answer

c.

Explanation

Correct option is C i.e.. yellow color, gas at room temperature and iodine displaced when react with aqueous potassium iodide. is the reaction Color, physical state is as given in figure

Image for Color of Fluorine

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