Acid Base (Trial SPM)

Which substance is an alkali? (Kelantan 2020, Q8)

• zinc hydroxide

• copper(II) sulphate

• potassium hydroxide

• aluminium oxide

Which of the following affect the pH value of an acid? (N.Sembilan 2020, Q19)

• solubility of acid in water

• temperature of the acid solution

• concentration of the hydrogen ions

• number of hydrogen atoms in the molecule of the acid

Which of the following is true about weak acid? (Johor 2020, Q6)

• The pH is less than 7

• Turn red litmus paper to blue

• Has low concentration of hydrogen ions

• Completely ionises in the water to produce hydrogen ion, H+

The following solutions have the same concentration. Which solution has the lowest pH value? (SBP 2020, Q14)

• nitric acid

• methanoic acid

• calcium hydroxide

• potassium hydroxide

A solution of sodium hydroxide has a concentration of 0.02 g dm^-3 . What is the pH of the alkali? [Relative atomic mass : H = 1, O = 16, Na = 23]

• 1.7

• 3.30

• 10.7

• 12.3

The molarity of sulphuric acid used as an electrolyte in a car battery is 2.0 mol dm^-3. What is the concentration in g dm^-3. [Relative atomic mass: H=1, O=16, S=32] (Kelantan 2020, Q45)

• 49.0

• 98.0

• 196.0

• 392.0

A standard solution is prepared by using dilution method. What is the volume of distilled water needed to be added to 40.0 cm³ of 1.0 mol dm^-3 sodium hydroxide solution to produce a solution with the concentration of 0.25 mol dm^-3 (SBP 2020, Q45)

• 40.0 cm³

• 120.0 cm³

• 160.0 cm³

• 200.0 cm³

3.5 g of lithium is burnt in an excess oxygen. The metal oxide produced is dissolved in water to produce 100 cm3 of solution. What is the molarity of the solution produced? [Relative atomic mass of Li = 7] (SPMRSM 2020, Q48)

• 2.500 mol dm^-3

• 5.000 mol dm^-3

• 0.005 mol dm^-3

• 0.025 mol dm^-3

Ba(OH)₂ + 2HCl --> BaCl₂ + 2H₂O

What is the volume of 0.5 mol dm^-3 hydrochloric acid needed to neutralise 25 cm³ of 0.1 mol dm^-3 barium hydroxide solution? (SPMRSM 2020, Q38)

• 12.5 cm³

• 10.0 cm³

• 5.0 cm³

• 2.5 cm³

25.0 cm³ of sulphuric acid neutralises 50.0 cm³ of 0.1 mol dm^-3 sodium hydroxide solution. What is the pH of the sulphuric acid?

• 1.0

• 1.5

• 2.0

• 2.5