CIE Chemistry (US-0439): Specimen Questions with Answers 105 - 107 of 240

Question number: 105

True-False▾

Is the Following Statement True or False?

Sulphuric acid is used to make fire extinguisher.

Answer

TRUE

Explanation

Sulphuric acid is used to make fire extinguisher.

In the soda-acid fire extinguisher, carbon dioxide is generated by mixing sulfuric acid with a solution of sodium bicarbonate.

So, the statement is true.

Question number: 106

MCQ▾

Question

Before the theory proposed by Newton, what was the idea regarding bonding of atoms?

Choices

Choice (4) Response

a.

Atoms have hooks to which they get attached and form a bond

b.

2 atoms overlap with each other to form a bond

c.

2 atoms collide and form a bond

d.

None of the above

Answer

a.

Explanation

Before the theory proposed by Newton, the idea regarding bonding of atoms was that the atoms have hooks to which they get attached and form a bond. The scientists in those days probably got influenced by the hand of the pirates where a hook was attached to one of their hands.

Image of the atoms have hooks

Image of the Atoms Have Hooks

Image of the atoms have hooks

Question number: 107

MCQ▾

Question

The functional group present in alcohols is:

Choices

Choice (4) Response

a.

COOH

b.

OH2

c.

OH

d.

CHO

Answer

c.

Explanation

Correct option is C. Functional group is an atom or a group of atoms which defines the structure and the chemical and physical properties of a particular family of the organic compounds.

Alcohols have functional group.

Primary alcohol

OH functional group.

OH Functional Group.

OH functional group.