6.1 Role of Water in Showing Acidic and Alkaline Properties

Report 1 / 5

What is the definition of acid?

(A)		Chemicals that ionises in water to form hydroxide ion, \(OH^-\)

(B)		Chemicals that ionises in water to form hydrogen ion, \(H^+\)

(C)		Chemicals that ionises in benzene to form hydrogen ion, \(H^+\)

(D)		Chemicals that ionises in benzene to form hydroxide ion, \(OH^-\)

Difficulty Level: Easy

Report 2 / 5

Which statement explains why water is needed to show the acidic properties of an acid?

(A)		Water oxidises the acid

(B)		Neutralisation of acid occurs in water

(C)		Water dissolves the acid

(D)		Ionisation of acid occurs in water

Difficulty Level: Medium

Report 3 / 5

Sulphuric acid is a monoprotic acid.

Is this statement true or false?

Difficulty Level: Easy

Report 4 / 5

Which of the following statement is not true?

(A)		All bases that are soluble in water are alkalis

(B)		When alkali is tested with a phenolphthalein indicator, the solution turns blue

(C)		When acid is dissolved in water and tested with a red litmus paper, the litmus paper shows no changes

(D)		When alkali is tested with a blue litmus paper, the litmus paper shows no changes

Difficulty Level: Medium

Report 5 / 5

Solution \(A\) and \(B\) are colourless solutions and are tested separately with a red and blue litmus paper.

The observations made are as follows.

Solution	Observation made when tested with the litmus paper
Solution	Red	Blue
\(A\)	No changes	Litmus paper turns red
\(B\)	Litmus paper turns blue	No changes

Predict the observation when Solution \(A\) and \(B\) are tested with phenolphthalein indicator.

	Solution \(A\)	Solution \(B\)
(A)	Solution turns pink	Solution turns pink
(B)	Solution remains colourless	Solution remains colourless
(C)	Solution turns pink	Solution remains colourless
(D)	Solution remains colourless	Solution turns pink

Difficulty Level: Medium