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Chemistry · Oct / Nov 2018 · Paper 12 · Question 20

5070The characteristic properties of acids and bases

Three separate mixtures of a solution and a solid are made, as shown in the table. The mixtures are warmed. In which mixtures does gas form?

  1. ANaOH(aq) and NH4Cl(s): ✓; H2SO4(aq) and NH4Cl(s): ✓; H2SO4(aq) and Mg(s): ✗
  2. BNaOH(aq) and NH4Cl(s): ✓; H2SO4(aq) and NH4Cl(s): ✗; H2SO4(aq) and Mg(s): ✓
  3. CNaOH(aq) and NH4Cl(s): ✗; H2SO4(aq) and NH4Cl(s): ✓; H2SO4(aq) and Mg(s): ✗
  4. DNaOH(aq) and NH4Cl(s): ✗; H2SO4(aq) and NH4Cl(s): ✗; H2SO4(aq) and Mg(s): ✓

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Correct answer: B. NaOH(aq) and NH4Cl(s): ✓; H2SO4(aq) and NH4Cl(s): ✗; H2SO4(aq) and Mg(s): ✓

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