Preparation of salts: past paper questions
Real questions on preparation of salts
The newest 20 of 35 written questions. Open one to see it on the real paper.
- 0620/33 · May/June 2026 · Q3a(ii)[1]
Name the salt formed when calcium carbonate reacts with dilute hydrochloric acid.
See it on the paper → - 0620/61 · May/June 2026 · Q3b[1]
Identify solid A. Tests on solution B Solution B is aqueous aluminium nitrate. The student divides solution B into two approximately equal portions. Record the expected observations.
See it on the paper → - 0620/42 · February/March 2026 · Q2b(ii)[2]
State the name and give the formula of the salt formed when aluminium oxide reacts with dilute hydrochloric acid. name
See it on the paper → - 0620/42 · February/March 2026 · Q2c(i)[2]
Complete the equation for the reaction of aluminium oxide with aqueous sodium hydroxide by inserting the missing formula and balancing the equation.
See it on the paper → - 0620/42 · February/March 2026 · Q2c(ii)[1]
Write the formula of the anion in NaAl O 2 .
See it on the paper → - 0620/42 · February/March 2026 · Q3a(iii)[3]
Calculate the mass of sodium chloride formed when excess burning sodium metal is placed into 960 cm 3 of chlorine gas at room temperature and pressure in method 1. (iii) mass = g
See it on the paper → - 0620/31 · October/November 2025 · Q3a(iv)[1]
Calculate the mass of nitrate ions, NO 3– , in 200 cm 3 of river water. mass = mg
See it on the paper → - 0620/31 · October/November 2025 · Q3b[1]
Give the formulae of two ions from Table 3.1 which can be combined with potassium ions to make an NPK fertiliser. and
See it on the paper → - 0620/31 · October/November 2025 · Q3c[2]
Name two ions from Table 3.1 which lead to deoxygenation of water and damage to aquatic life. and
See it on the paper → - 0620/31 · October/November 2025 · Q7e(iii)[1]
Name one other substance which can be added to dilute sulfuric acid to form aqueous copper( II ) sulfate.
See it on the paper → - 0620/42 · October/November 2025 · Q3f[2]
The actual mass of dry BaSO 4 collected in step 4 is greater than the expected mass. This is because the student should do an additional step between step 3 and step 4. Suggest what the student should do in this additional step, and explain why the actual mass collected is greater than the expected mass.
See it on the paper → - 0620/42 · October/November 2025 · Q3g[1]
State the name of this method of salt preparation.
See it on the paper → - 0620/42 · October/November 2025 · Q3h[3]
State the name of a different: • barium salt that can be used in place of BaCl • sulfate salt that can be used in place of Na 2 SO
See it on the paper → - 0620/42 · October/November 2025 · Q4a(vii)[1]
Name the salt formed when calcium reacts with ethanoic acid.
See it on the paper → - 0620/43 · October/November 2025 · Q3e[2]
The reaction of gallium( III ) oxide, Ga 2 O 3 , with aqueous sodium hydroxide forms a salt which contains the negative ion GaO 2– . The only other product is water. Write a symbol equation for this reaction.
See it on the paper → - 0620/32 · February/March 2025 · Q8b[1]
Potassium forms a salt when added to ethanoic acid. Name the salt formed.
See it on the paper → - 0620/43 · October/November 2024 · Q3b(ii)[2]
Write the symbol equation for the reaction between SnO 2 and NaOH.
See it on the paper → - 0620/63 · May/June 2024 · Q3d[2]
Identify solution L. [Total: 9]
See it on the paper → - 0620/32 · February/March 2024 · Q1e[1]
is a salt that contains a positive ion with a charge of 1+
See it on the paper → - 0620/32 · February/March 2024 · Q2a(ii)[1]
Name the compound that contains NH 4+ and SO 42– ions only.
See it on the paper →
What examiners said
Comprehensive responses • Most candidates were able to correctly name aluminium chloride as the product. Limited responses • Some candidates knew the formula of aluminium chloride.
— Examiner report, February/March 2026, 0620/42 Q2(b)(ii) (Cambridge)
Comprehensive responses • Most candidates were able to complete the equation. Limited responses • Some candidates did not balance the equation.
— Examiner report, February/March 2026, 0620/42 Q2(c)(i) (Cambridge)
Comprehensive responses • Some candidates deduced the formula of the anion as that of aluminate. Limited responses • Many candidates thought I was the formula of the oxide ion.
— Examiner report, February/March 2026, 0620/42 Q2(c)(ii) (Cambridge)
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