IGCSE Chemistry (0971) — May–June 2025, Paper 11
40 questions · every question answerable online with instant point-by-point AI marking against the official mark scheme.
Start with Question 1 →Which process happens when water vapour changes to rain? A boiling B condensing C evaporating D freezing
Answer this question and get it marked →The diagrams show the arrangement of particles in three different states of matter. State 1 shows particles closely packed in a random arrangement (a liquid); state 2 shows a few…
Answer this question and get it marked →An atom of element Q contains 19 electrons, 19 protons and 20 neutrons. What is Q? A calcium B potassium C strontium D yttrium
Answer this question and get it marked →Which part of an atom has a relative mass of 1 and a relative charge of 0? A electron B neutron C nucleus D proton
Answer this question and get it marked →Which row identifies the number of electrons, neutrons and protons in a particle which is an isotope of boron-11 (proton number 5, nucleon number 11)? electrons neutrons protons A…
Answer this question and get it marked →Which statements about potassium iodide are correct? 1 It is formed from potassium anions and iodide cations. 2 It is a good electrical conductor when molten or in aqueous…
Answer this question and get it marked →Which substances contain one or more shared pairs of electrons? 1 argon 2 methane 3 iron(III) oxide 4 chlorine A 1 and 3 B 1 and 4 C 2 and 3 D 2 and 4
Answer this question and get it marked →Which substance has a giant covalent structure at room temperature and pressure? A ammonia B carbon dioxide C diamond D water
Answer this question and get it marked →Which row shows the correct formula for the named substance? substance formula A cobalt(II) chloride Cu2Cl B sodium carbonate Na2CO3 C xenon Xe2 D ammonium sulfate NH4SO4
Answer this question and get it marked →The equation shows the thermal decomposition of magnesium carbonate. MgCO3 → MgO + CO2 [Mr: MgCO3, 84] Which mass of magnesium oxide is formed when 21.0 g of magnesium carbonate…
Answer this question and get it marked →Concentrated aqueous sodium chloride is electrolysed using inert electrodes. What is the main product formed at the positive electrode (anode)? A chlorine B hydrogen C oxygen D…
Answer this question and get it marked →A hydrogen-oxygen fuel cell uses 630 dm^3 of oxygen. The oxygen for the reaction is extracted from clean, dry air. What is the minimum volume of clean, dry air needed to provide…
Answer this question and get it marked →Three statements about energy changes in chemical reactions are listed. 1 In an endothermic reaction, the temperature of the surroundings increases. 2 In an exothermic reaction,…
Answer this question and get it marked →When a small piece of a Group I metal is placed into a large beaker of cold water, a reaction occurs. Four statements about this reaction are listed. 1 The metal melts. 2 Hydrogen…
Answer this question and get it marked →The equation for the decomposition of hydrogen peroxide is shown. 2H2O2 → 2H2O + O2 The reaction is exothermic. When a small amount of a catalyst is added, the oxygen is produced…
Answer this question and get it marked →The equation for the reaction between copper(II) oxide and carbon is shown. 2CuO + C → 2Cu + CO2 Which statement about this reaction is correct? A CuO is reduced. B CO2 is…
Answer this question and get it marked →Which row gives the colours observed when thymolphthalein and methyl orange are added separately to the named solution? solution colour with thymolphthalein colour with methyl…
Answer this question and get it marked →A mixture of two substances, R and S, is heated gently. A diagram shows a test-tube containing R and S being heated with gentle heat, with a piece of damp red litmus paper held at…
Answer this question and get it marked →Which reactants are used to make the salt copper(II) sulfate? A dilute acid + alkali B dilute acid + metal carbonate C dilute acid + metal D dilute acid + non-metal oxide
Answer this question and get it marked →Which statement about the Periodic Table is correct? A The elements are arranged in order of increasing relative atomic mass. B The reactivity of the elements in Group I and in…
Answer this question and get it marked →Part of the Periodic Table is shown, with four elements marked A, B, C and D at different positions. Element A is at the far left of the second period (a Group I/II metal).…
Answer this question and get it marked →E is an element from Group I of the Periodic Table. Two properties of E are listed. - It has a higher melting point than caesium. - It has a lower density than sodium. What is the…
Answer this question and get it marked →An equation for the displacement reaction between aqueous halogen, X2, and aqueous halide ions, Y-, is shown. X2(aq) + 2Y-(aq) → 2X-(aq) + Y2(aq) Which row identifies X2 and Y-…
Answer this question and get it marked →Some information about an element is shown. property value melting point / °C 1555 boiling point / °C 2963 colour of oxide brown use of element as a catalyst What is the position…
Answer this question and get it marked →The table shows the observations when four metals, Q, R, S and T, are added separately to cold water and to dilute hydrochloric acid. metal observation with cold water observation…
Answer this question and get it marked →Magnesium is reacted separately with dilute sulfuric acid and with steam. Which row correctly identifies if hydrogen is formed as a product in each reaction? (key: tick = hydrogen…
Answer this question and get it marked →Which statements about aluminium are correct? 1 It is more reactive than calcium. 2 The main ore of aluminium is bauxite. 3 It can be extracted from its oxide using carbon. 4…
Answer this question and get it marked →Steel is a mixture of iron and one or more other elements. The table gives some information about three common types of steel. type of steel elements added to iron properties 1…
Answer this question and get it marked →A diagram shows an experiment to investigate the corrosion of iron. Two test-tubes, P and Q, are held upside down with their open ends dipping into a container of water, trapping…
Answer this question and get it marked →Fertilisers are used to provide the three elements needed for improved plant growth. Which two compounds would provide all three of these elements? A ammonium nitrate and calcium…
Answer this question and get it marked →Which substances can be used to detect the presence of water? 1 anhydrous cobalt(II) chloride 2 anhydrous copper(II) sulfate 3 litmus 4 methyl orange A 1 and 2 B 1 and 3 C 2 and 4…
Answer this question and get it marked →What is produced by the incomplete combustion of methane? A carbon monoxide B hydrogen C lead compounds D sulfur dioxide
Answer this question and get it marked →Which row identifies compounds in the same homologous series? chemical properties functional group A different different B different same C similar different D similar same
Answer this question and get it marked →The molecular formula of compound Z is C4H10. Which row identifies the substance that reacts with Z and describes the type of reaction that occurs? substance type of reaction A…
Answer this question and get it marked →Which list shows the fractions obtained from the fractional distillation of petroleum, in order of increasing boiling point? A bitumen → diesel oil → fuel oil → lubricating oil B…
Answer this question and get it marked →Three statements about cracking of larger alkane molecules are listed. 1 Cracking produces petrol for cars. 2 Cracking only produces short-chain alkenes. 3 Cracking produces…
Answer this question and get it marked →Some words used to describe organic compounds are listed. 1 hydrocarbon 2 monomer 3 saturated 4 unreactive Which words describe ethene? A 1 and 2 B 1 and 3 C 2 and 4 D 3 and 4
Answer this question and get it marked →A student measures 25.00 cm^3 of dilute hydrochloric acid accurately. Which piece of apparatus is most suitable? A beaker B measuring cylinder C burette D dropping pipette
Answer this question and get it marked →Excess solid magnesium oxide is added to dilute nitric acid. Which separation technique is used to remove the excess solid magnesium oxide after the reaction finishes? A…
Answer this question and get it marked →Four different aqueous metal nitrates are tested separately with aqueous sodium hydroxide, with dilute sulfuric acid and with a flame test. Which row shows the correct set of…
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