Question detail
Chemical changes case 155 salt-method. A student plans a salt preparation method. Which option is most creditworthy? Focus on non-metal oxides acidic in Metal oxides, not on a neighbouring Unit 4.4 reaction idea.
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
MCQ
Type
practice
Style
Topic
Reactivity of metals
Question
- A. Chemical changes case 155 salt-method: Uses the correct reactants, separation step and crystallisation idea for non-metal oxides acidic
- B. Chemical changes case 155 salt-method: Evaporates to dryness when crystals should be formed carefully (Metal oxides)
- C. Chemical changes case 155 salt-method: Adds indicator to every salt preparation regardless of method (non-metal oxides acidic)
- D. Chemical changes case 155 salt-method: Names a salt but omits how excess solid or solution is handled (Reactivity of metals)
Answer
The correct option is Chemical changes case 155 salt-method: Uses the correct reactants, separation step and crystallisation idea for non-metal oxides acidic.
Explanation
The correct option is Chemical changes case 155 salt-method: Uses the correct reactants, separation step and crystallisation idea for non-metal oxides acidic. It is correct because it directly supports the approved learning objective to describe non-metal oxides as acidic in Metal oxides. The other options are incorrect because they blur a Unit 4.4 concept boundary: acid versus alkali versus base, oxidation versus reduction, displacement versus reduction, electrolysis versus electroplating, anode versus cathode, positive versus negative ions, oxidation state versus ionic charge, or strong acid versus concentrated acid.
Common mistake
Misunderstanding Non-Metal Oxides
Students often confuse non-metal oxides with metal oxides, thinking they are basic instead of acidic.
Remember that non-metal oxides are acidic, while metal oxides are typically basic. Focus on the type of element in the oxide to determine its properties.
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