CIE Chemistry (US-0439): Specimen Questions with Answers 213 - 215 of 240

Question number: 213

MCQ▾

Question

Group elements are also known as ________.

Choices

Choice (4) Response

a.

halogens

b.

alkaline earth metals

c.

alkali metals

d.

transition elements

Answer

c.

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

MCQ▾

Question

Which of the following statements is false?

Choices

Choice (4) Response

a.

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

b.

Alkali metals form their hydroxides when they react with water.

c.

Alkali metals form their oxides when they react with water.

d.

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

Answer

c.

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 number: 215

MCQ▾

Question

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

Which row shows the properties of fluorine?

Choices

Choice (4) Response

a.

Table showing properties of fluorine:Choice A

Table Showing Properties of Fluorine: Choice A

Table showing properties of fluorine

b.

Table showing properties of fluorine:Choice B

Table Showing Properties of Fluorine: Choice B

Table showing properties of fluorine

c.

Table showing properties of fluorine:Choice C

Table Showing Properties of Fluorine: Choice C

Table showing properties of fluorine

d.

Table showing properties of fluorine:Choice D

Table Showing Properties of Fluorine: Choice D

Table showing properties of fluorine

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

Image for Color of Fluorine

Image for Color of fluorine