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Science (086) — AI-generated practice question

AI-generated practice question — model-generated for extra practice, not a previous-year CBSE board question.

Q1. [1] straightforward initial-understanding
When a magnesium ribbon is burned in air, it produces a white powder. What is this powder, and what two substances reacted to form it?
Generated by claude-sonnet-4-6 · 2026-06-26 00:53 · grounding rag
Model Answer

The white powder is magnesium oxide (MgO). It is formed by the reaction of magnesium and oxygen.

Source: Chemical Reactions and Equations, Section 1.1; Metals and Non-metals, Section 3.2.1

Explanation

The examiner expects the name/formula of the product and both reactants named clearly. The word equation is: Magnesium + Oxygen → Magnesium oxide. Mentioning "air" in the question is acceptable since oxygen is the reactive component in air; the product remains magnesium oxide.

Previous-year CBSE Grade 10 board exam questions, organised by subject and chapter, each with a model answer — free to read and print.