Difficulty: Easy
Question 1:
Most insect bites cause a stinging sensation because of the injection of a weak acid into the surface of the skin. Which substance could be used to neutralise the acid from an insect bite?
Substance
- A: battery acid (pH 1)
- B: toothpaste (pH 8)
- C: grill cleaner (pH 13)
- D: lime juice (pH 3)
Question 2:
Hydrochloric acid is often used to clean metals by reacting with the surface coating which develops on some metals when exposed to the atmosphere. Which row correctly describes the surface coating on these metals?
Options:
- A: oxide (basic) - reacts with acid
- B: oxide (acidic) - reacts with basic
- C: alloy (acidic) - reacts with basic
- D: alloy (basic) - reacts with acid
Question 3:
Calcium reacts with sulfuric acid to form the salt, calcium sulfate, and another product. What is the other product?
- A: Oxygen
- B: Hydrogen
- C: Water
- D: Carbon dioxide
Question 4:
Which words complete the gaps 1 & 2 in these sentences?
Aqueous solutions of acids contain 1 ions and aqueous solutions of alkalis contain 2 ions.
- A: Na+ (1), OH– (2)
- B: OH– (1), H+ (2)
- C: H+ (1), Cl– (2)
- D: H+ (1), OH– (2)
Question 5:
Indicators are substances that change colour when they are added to acidic or alkaline solutions.
Indicator Colours:
- Methyl orange: red (acid), orange (alkali)
- Litmus: red (acid), blue (alkali)
- Thymolphthalein: blue (acid), colourless (alkali)
- Universal indicator: green (acid), purple (alkali)
Difficulty: Medium
Question 6:
A student is provided with an unmarked beaker containing a colourless solution and asked to identify it. The student decides to perform a series of reactions with the solution and record the observations.
Which of these observations is not indicative of an acid?
- 1: The solution causes blue litmus to turn red.
- 2: On heating and the addition of copper oxide, the solution turns blue.
- 3: On the addition of ammonium carbonate, a colourless, pungent gas is released.
- 4: On the addition of a piece of magnesium, effervescence was produced and the magnesium piece ‘disappeared’ after a few minutes.
Question 7:
Which of the following statements is not correct?
- 1: Ammonia is released when a base reacts with an ammonium salt.
- 2: Neutralisation occurs when an acid and an alkali react together.
- 3: Carbon dioxide is released when an acid and a carbonate react together.
- 4: The higher the pH of a solution, the higher its acidity.
Question 8:
Which of the following properties is not indicative of a base?
- 1: Carbon dioxide is released when it reacts with a carbonate.
- 2: A salt is formed on reaction with an acid.
- 3: Ammonia is released on reaction with an ammonium salt.
- 4: Universal indicator paper turns blue when placed in an alkaline solution.
Question 9:
A student was given an unknown substance and asked to analyse it. The student decided to perform three tests and recorded the results as shown below.
- 1: On heating with ammonium chloride a gas is released.
- 2: The substance turns methyl orange yellow.
- 3: The substance does not react with potassium carbonate.
What kind of substance was the student given?
- A: A salt
- B: A metal
- C: A base
- D: An acid
Question 10:
A student is testing two substances, P and Q, as shown.
The results of the test are that the Universal indicator paper turns blue. What are substances P and Q?
- 1: HCl and NH4NO3
- 2: NaOH and NH4NO3
- 3: NaCO3 and HCl
- 4: NaCO3 and NaOH
Difficulty: Hard
Question 11:
Ionic equations 1 and 2 show how substance X behaves in aqueous solution.
1: X- + H+ → XH
2: X → X- + H+
Which row correctly describes substance X?
- A: acid (1), base (1)
- B: acid (1), base (2)
- C: acid (2), base (2)
- D: acid (2), base (1)
Question 12:
In a reaction rate experiment, a student used equal volumes of acids P and Q to react with excess magnesium in separate conical flasks. The following observations were recorded:
- 1: Acid P produces hydrogen gas faster than acid Q.
- 2: Both gases produce the same total volume of hydrogen gas.
Which statement correctly explains the students' observations?
- 1: Acid P has a higher pH than acid Q
- 2: P is a carboxylic acid
- 3: Q is a weaker acid than P
- 4: P is more concentrated than Q
Question 13:
Which indicator displays the correct colour in each solution?
- Methyl orange: red (acid), yellow (alkali)
- Universal indicator: red (acid), orange (alkali)
- Litmus: red (acid), purple (alkali)
- Thymolphthalein: blue (acid), colourless (alkali)
- A: Methyl orange
- B: Universal indicator
- C: Litmus
- D: Thymolphthalein
Question 14:
Which equation does not show the correct reaction of an acid?
- 1: CuO + 2HCl → CuCl2 + H2O
- 2: CaCO3 + HNO3 → CaNO3 + CO2 + H2O
- 3: 2KOH + H2SO4 → K2SO4 + 2H2O
- 4: Zn + H2SO4 → ZnSO4 + H2
Question 15:
The pH of two samples of different dilute acids were found. Acid X had a pH of 6, Acid Y had a pH of 3. Which statement is correct?
- 1: The hydrogen ion concentration of acid X is 1000 times greater than acid Y
- 2: The hydrogen ion concentration of acid Y is 3 times greater than acid X
- 3: The hydrogen ion concentration of acid Y is 1000 times greater than acid X
- 4: The hydrogen ion concentration of acid X is 100 times greater than acid Y
Difficulty: Easy
Question 16:
Which of the following formulae shows an alkane?
- A: C2H4
- B: C4H8
- C: C4H10
- D: C5H10
Question 17:
Which of the following structures shows a compound that belongs to a different homologous series to octane?
Question 18:
The diagram shows the structure of ethene. Which of these compounds has similar chemical properties of ethene?
Question 19:
The structures of four organic compounds are shown. Which one does not show the displayed formula of the compound?
Question 20:
Extended Only: Which of the following is not a feature of a homologous series?
- A: Compounds have the same functional group
- B: Compounds have the same physical properties
- C: Compounds have the same general formula
- D: Compounds have similar chemical properties
Difficulty: Medium
Question 21:
Which one of the following structures is correctly named?
Question 22:
Organic compounds can have names that have the suffixes of -ane, -ene, -ol or -oic acid. How many of these have at least one double bond in their structure?
- A: 1
- B: 2
- C: 3
- D: 4
Question 23:
When the number of atoms in a molecule of a hydrocarbon increases, the amount of energy released when it burns increases. What is the correct order?
- A: Methane, Ethene, Ethane
- B: Ethene, Ethane, Methane
- C: Ethene, Methane, Ethane
- D: Methane, Ethane, Ethene
Question 24:
The diagram below represents the molecule of a compound. What is the name of this compound?
- A: Ethane
- B: Ethanol
- C: Ethanoic acid
- D: Ethene
Question 25:
Separate: Chemistry and Extended Only. The structures of six organic compounds compound A are shown. Which two compounds are isomers of one another?
- A: B and D
- B: A and C
- C: C and F
- D: C and E
Difficulty: Hard
Question 26:
The first three members of a homologous series are shown. Why do these molecules represent a homologous series?
- A: They contain carbon and hydrogen atoms.
- B: They have saturated bonds.
- C: They have the same functional group.
- D: They react differently from each other.
Question 27:
Which pair of the following structures shows a homologous series?
Question 28:
Which group of compounds is from a homologous series?
- A: CH3OH, C2H5OH, C3H7OH
- B: C3H6, C3H8, C3H7OH
- C: CH4, C2H4, C3H8
- D: CH3CO2H, CH3CH2OH, HCO2H
Question 29:
Extended Only: The diagram below shows some simple hydrocarbons and the products of two reactions. Which of these structures are named correctly?
Question 30:
Extended Only: The diagram below shows a reaction scheme. What are the names of all of the compounds?
- A: ethene, ethane, ethanoic acid, ethanol
- B: ethane, ethene, ethanol, ethanoic acid
- C: ethene, ethane, ethanol, ethanoic acid
- D: ethane, ethene, ethanoic acid, ethanol
Question 31:
Which of the following formulae shows an alkane?
- Choice 1: C2H4
- Choice 2: C4H8
- Choice 3: C4H10
- Choice 4: C5H10
Question 32:
Which of the following structures shows a compound that belongs to a different homologous series to octane?
Question 33:
The diagram shows the structure of ethene.
Question 34:
The structures of four organic compounds are shown.
Question 35:
Which of the following is not a feature of a homologous series?
- Choice 1: Compounds have the same functional group
- Choice 2: Compounds have the same physical properties
- Choice 3: Compounds have the same general formula
- Choice 4: Compounds have similar chemical properties
Question 36:
Which one of the following structures is correctly named?
Question 37:
Organic compounds can have names that have the suffixes of -ane, -ene, -ol or -oic acid.
- Choice 1: 1
- Choice 2: 2
- Choice 3: 3
- Choice 4: 4
Question 38:
When the number of atoms in a molecule of a hydrocarbon increases, the amount of energy released when it burns increases.
Question 39:
The diagram below represents the molecule of a compound.
- Choice 1: Ethane
- Choice 2: Ethanol
- Choice 3: Ethanoic acid
- Choice 4: Ethene
Question 40:
The structures of six organic compounds are shown.
- Choice 1: B and D
- Choice 2: A and C
- Choice 3: C and F
- Choice 4: C and E
Question 41:
The first three members of a homologous series are shown.
- Choice 1: They contain carbon and hydrogen atoms.
- Choice 2: They have saturated bonds.
- Choice 3: They have the same functional group.
- Choice 4: They react differently from each other.
Question 42:
Which pair of the following structures shows a homologous series?
Question 43:
Which group of compounds is from a homologous series?
- Choice 1: CH3OH, C2H5OH, C3H7OH
- Choice 2: C3H6, C3H8, C3H7OH
- Choice 3: CH4, C2H4, C3H8
- Choice 4: CH3CO2H, CH3CH2OH, HCO2H
Question 44:
The diagram below shows some simple hydrocarbons and the products of two reactions.
Question 45:
The diagram below shows a reaction scheme. What are the names of all of the compounds?