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2023 O Level Pure Chemistry Paper 1 — All Solutions

40 multiple-choice questions · Free video solutions
P1 Q1
Preparation of Salts
A student prepares a pure sample of sodium sulfate from dilute sulfuric acid and aqueous sodium hydroxide. Which apparat…
P1 Q2
Experimental Techniques / Mole Calculations
A flask contains solution X. Solution X is a mixture of aqueous sodium hydroxide and aqueous sodium carbonate. Which app…
P1 Q3
Chromatography
Solution Y contains a mixture of flavourings. Solution Y and four other solutions, A, B, C and D, are analysed by chroma…
P1 Q4
Qualitative Analysis
Two tests on a white powder are shown. 1 Aqueous sodium hydroxide is added and the mixture is warmed. The gas produced t…
P1 Q5
Acids, Bases and Redox
Sulfur dioxide, SO₂, is dissolved in a little water to make a solution. The pH of the solution is tested. Sulfur dioxide…
P1 Q6
Qualitative Analysis
What is observed if aqueous potassium iodide is added to aqueous silver nitrate?…
P1 Q7
Kinetic Particle Theory
The graph shows the temperature of a solid as it is heated. Which change is labelled correctly?…
P1 Q8
Kinetic Particle Theory
Which gas diffuses most rapidly?…
P1 Q9
Atomic Structure
Which ion contains the same number of electrons as ⁵⁶₂₆Fe³⁺?…
P1 Q10
Structure and Bonding
Which statement about diamond and silicon dioxide is correct?…
P1 Q11
Ionic Bonding and Electrolysis
Which property is shown by all ionically bonded metal compounds?…
P1 Q12
Covalent Bonding
Which statement about covalently bonded substances is correct?…
P1 Q13
Metallic Bonding and Electrical Conduction
In the liquid state, which substance conducts electricity using mobile electrons?…
P1 Q14
The Mole
What contains the smallest number of particles?…
P1 Q15
Empirical Formula
A chemical in a paint has the following composition. cobalt 48.2%, phosphorus 16.9%, oxygen 34.9%. What is its empirical…
P1 Q16
Stoichiometry / Combustion
100 cm³ of methane is burned in 150 cm³ of oxygen. When cooled to room temperature, what could be the resulting mixture …
P1 Q17
Electrolysis
Dilute aqueous sodium chloride is electrolysed using inert electrodes. 25.0 cm³ of hydrogen gas is produced at the negat…
P1 Q18
Stoichiometry / Reacting Mass
Excess aqueous sodium chloride is added to 25 cm³ of 0.1 mol/dm³ lead(II) nitrate. Pb(NO₃)₂(aq) + 2NaCl(aq) → PbCl₂(s) +…
P1 Q19
Electrolysis / States of Matter
The diagrams represent the arrangement of particles in different substances at 300 °C. Which substance can be electrolys…
P1 Q20
Simple Cells / Electrochemistry
A simple cell is shown. The electrolyte is a mixture of aqueous copper(II) nitrate and aqueous zinc nitrate. Which pair …
P1 Q21
Energetics / Catalysts
Ammonia is made from its elements in a reversible reaction. The energy profile diagram for the formation of ammonia is s…
P1 Q22
Energetics / Bond Energies
Bromine reacts rapidly with ethene to form dibromoethane. The equation for the reaction and enthalpy change are shown. C…
P1 Q23
Rate of Reaction
Hydrogen peroxide decomposes to produce water and oxygen. The equation for this reaction is shown. 2H₂O₂ → 2H₂O + O₂. An…
P1 Q24
Redox
Which chemical changes represent reduction? 1 Cu → Cu²⁺. 2 I₂ → 2I⁻. 3 2NO₃⁻ → N₂O₅. 4 SO₄²⁻ → SO₂.…
P1 Q25
Strong vs Weak Acids
50.0 cm³ of hydrochloric acid has a pH of 1.0. This acid requires 25.0 cm³ of aqueous sodium hydroxide to be neutralised…
P1 Q26
Preparation of Salts
Which method of preparation would be suitable for making these salts?…
P1 Q27
Qualitative Analysis
Two substances are mixed and warmed. No visible reaction occurs. Aluminium foil is added and the mixture is warmed again…
P1 Q28
Group I / Periodic Trends
Which statement about the alkali metals is correct?…
P1 Q29
Periodic Table
Part of the Periodic Table is shown. Which statement about the elements P, Q, R and S is correct?…
P1 Q30
Transition Elements
Iron, nickel and chromium are all transition elements. Which properties illustrate this? 1 Iron reacts with dilute hydro…
P1 Q31
Alloys
The diagrams represent atoms in pure gold and atoms in an alloy of gold and copper. Which statement is correct?…
P1 Q32
Reactivity Series
G is a metal. It occurs naturally as an element and sometimes in ores containing its oxide. G forms chloride GCl. No oth…
P1 Q33
Corrosion of Metals
Brass is an alloy of copper and zinc. In an experiment, a brass rod is placed separately in contact with four different …
P1 Q34
Fractional Distillation of Petroleum
The diagram shows the fractional distillation column used to separate petroleum into useful fractions. Which fractions a…
P1 Q35
Isomerism
Which molecular formulae have exactly two isomers? 1 C₃H₈. 2 C₄H₈. 3 C₄H₁₀.…
P1 Q36
Cracking / Alkenes / Haber Process
The hydrocarbon C₁₆H₃₄ is cracked to form three products, X, Y and Z. The equation is shown. C₁₆H₃₄ → 3X + C₁₀H₂₀ + Z, w…
P1 Q37
Empirical Formula / Alcohols
An alcohol is completely combusted in excess oxygen. Two products are formed, 1.65 g of carbon dioxide and 0.90 g of wat…
P1 Q38
Alkenes / Esters
Butene, CH₂CHCH₂CH₃, is reacted with steam in the presence of an acid catalyst to form compound P. Compound P reacts wit…
P1 Q39
Empirical Formula / Organic Chemistry
Compound R has the empirical formula C₂H₄O. What could be the identity of R? 1 butanoic acid. 2 ethanoic acid. 3 ethanol…
P1 Q40
Air / Ozone Layer
Which statement about ozone, O₃, is correct?…