CIE Chemistry (US-0439): Specimen Questions with Answers 78 - 80 of 240

Question number: 78

MCQ▾

Question

The table shows the boiling points of four members of the homologous series of alcohols.

Image of Boiling for homologous series of alcohols

Image of Boiling for Homologous Series of Alcohols

Image of Boiling for homologous series of alcohols

What is the value of X?

Choices

Choice (4) Response

a.

b.

c.

d.

Answer

a.

Explanation

Correct answer is C i. e. 98C because IUPAC name of C3H7OH is 1 – propanol and boiling point of this is 98C.

Question number: 79

MCQ▾

Question

________ ionise partially and produce less concentration of ions.

Choices

Choice (4) Response

a.

Strong acids

b.

Weak bases

c.

Weak acids

d.

Strong bases

Answer

b.

Explanation

Weak bases ionise partially and produce less concentration of ions. E. g. , etc.

Question number: 80

Short Answer Question▾

Write in Short

The table shows some physical properties of the Group VII elements.

some physical properties of the Group VII elements

Some Physical Properties of the Group VII Elements

some physical properties of the Group VII elements

Describe the trend in atomic radius going down the group from chlorine to iodine.

………………………………………………………………………………………………………

Explanation

Atomic radii tend to get smaller as you move from left to right along the periodic table and larger as you move down the periodic table. Halogens are all part of the same group. However, as you move down the periodic table, the halogens with larger atomic numbers are heavier, have larger atomic radii, and have more protons, neutrons and electrons.