WorksheetsForm 4 - Acid and Base
Total questions: 15
Worksheet time: 30mins
Which statement is correct about acid?
Acid solution conducts electric current
Strong acid ionizes partially in water
Weak acid produces high concentration of hydrogen ions
The presence of water enables acid to produce hydroxide ions
Which substance is an alkali?
Zinc oxide
Magnesium oxide
Potassium hydroxide
Aluminium hydroxide
Table above shows the pH values of two solutions with the same concentration.
Which statement explains the differences in the pH values?
Q ionizes partially whereas R ionizes completely
The concentration of hydrogen ions in Q is lower than R
The number of mole of hydrogen ions in Q is less than R
The degree of ionization of Q is higher than R
Which acid contains the highest number of hydrogen ions?
25 cm3 of 1 mol dm-3 nitric acid
25 cm3 of 1 mol dm-3 ethanoic acid
25 cm3 of 1 mol dm-3 sulphuric acid
25 cm3 of 1 mol dm-3 hydrochloric acid
Diagram above shows two beakers, P and Q that contain granulated limestones, CaCO3 and pH paper respectively in dilute ethanoic acid.
Which observation is correct?
Gas bubble is released in beaker P and pH value in beaker Q is 1
Gas bubble is released in beaker P and pH value in beaker Q is 4
Solution turns cloudy in beaker P and pH value in beaker Q is 4
There is no change in beaker P and pH value in beaker Q is 1
pH is a measure of
hydrogen concentration
hydroxide concentration
hydrogen ion concentration
hydroxide ion concentration
Which of the following is the correct sequence in preparation of a solution by dilution method?
I Transfer the solution into a volumetric flask
II Calculate the volume of solution to be diluted
III Use a pipette to obtain the volume of solution needed
IV Add distilled water to the required volume of solution
II, I, III, IV
II, I, IV, III
II, III, I, IV
II, III, IV, I
The following equation represents the reaction between hydrochloric acid and calcium hydroxide solution.
2HCl(aq) + Ca(OH)2(aq) → CaCl2(aq) + H2O(l)
20 cm3 of 0.1 mol dm-3 hydrochloric acid is neutralised by 50 cm3 of calcium hydroxide solution.
What is the molarity of calcium hydroxide solution?
0.02 mol dm-3
0.04 mol dm-3
0.125 mol dm-3
0.25 mol dm-3
Which of the following is correct about weak alkaline solution?
Have pH value of 13
Partially ionised in water
Concentration of the solution is low
Solution does not react with acid
What is the number of moles in 100 cm3 of 1.5 mol dm-3 of nitric acid?
0.015 mol
0.100 mol
0.150 mol
1.500 mol
Substance Y reacted with dilute nitric acid to produce colorless gas. This gas dissolved in water to form a solution with pH value less than 7.
Which of the following is substance Y?
Sodium oxide
Sodium chloride
Sodium carbonate
Sodium hydroxide
A standard solution was prepared by dissolving 6.30 g of oxalic acid, H2C2O4.2H2O in water to make up 250 cm3 of solution. What is the molarity of the acid solution?
[RAM: H=1, C=12, O=16]
0.05 mol dm-3
0.07 mol dm-3
0.10 mol dm-3
0.20 mol dm-3
Which of the following substances is a monoprotic acid?
Propanoic acid, C2H5COOH
Phosphoric acid, H3PO4
Sulphuric acid, H2SO4
Carbonic acid, H2CO3
A factory worker wants to remove the oxide layer on the surface of the steel used to make a body car. Which substance is suitable to be used for that purpose?
Detergent
Sulphur dioxide
Dilute hydrochloric acid
Dilute potassium hydroxide
Which of the following solution will form brown precipitate which is insoluble in excess sodium hydroxide solution?
Copper (II) sulphate
Magnesium sulphate
Iron (II) sulphate
Iron (III) sulphate
