Q1. [1] straightforward exam-ready
When magnesium ribbon is burned in air, the product formed is:
(A) Magnesium nitride
(B) Magnesium hydroxide
(C) Magnesium oxide
(D) Magnesium carbonate
- A Magnesium nitride
- B Magnesium hydroxide
- C Magnesium oxide
- D Magnesium carbonate
Generated by claude-sonnet-4-6 · 2026-06-26 00:53 · grounding rag
Model Answer
(C) Magnesium oxide
When magnesium ribbon is burned in air, it reacts with oxygen to form magnesium oxide: Magnesium + Oxygen → Magnesium oxide.
Source: Chapter 1, Section 1.1; Chapter 3, Section 3.2.1
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Explanation
- The textbook explicitly states: "when a magnesium ribbon is burnt in oxygen, it gets converted to magnesium oxide."
- Air contains oxygen, so burning in air produces the same oxide product.
- Magnesium nitride (A) can form in pure nitrogen, but in air the dominant reaction is with oxygen. The textbook does not mention nitride formation here — always go with what the prescribed text states.
- For a 1-mark MCQ, simply identifying the correct option with a one-line justification is sufficient.