CIE Chemistry (US-0439): Specimen Questions with Answers 119 - 122 of 240

Question number: 119

MCQ▾

Question

are all examples of ________.

Choices

Choice (4) Response

a.

Base

b.

Acid

c.

Salt

d.

None of the above

Answer

a.

Explanation

produce ions when dissolved in water. ions indicate the presence of base. Thus, are all examples of bases.

Question number: 120

Short Answer Question▾

Write in Short

Impure water needs to be treated if it is to be used in the home.

Describe a chemical test for water.

test ……………………………………………………………………………………………………………………

result ……………………………………………………………………………………………………………

Explanation

TEST Water can also be detected using blue anhydrous cobalt chloride.

RESULT

Question number: 121

Short Answer Question▾

Write in Short

The structures of five atoms, A, B, C, D, and E, are shown below.

structures of five atoms

Structures of Five Atoms

structures of five atoms

Which structure has two neutrons in its nucleus? ……. .

Explanation

Correct option is B because option B represent Helium (He) gas and helium gas has no. of electron is , no. of proton is and no. of neutron is .

Question number: 122

MCQ▾

Question

The first metal used by early man in “Chalcolithic period” was ________.

Choices

Choice (4) Response

a.

Silver

b.

Iron

c.

Copper

d.

Golden

Answer

c.

Explanation

  • Chalcolithic came from the Greek word “chalcos” which means ‘copper’ and “lithos” which means ‘stone’.

  • The first metal used by the early man in “Chalcolithic period” was copper.