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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
Iron reacts with oxygen to form iron oxide. A student writes: Fe + O₂ → Fe₂O₃. What term is used to describe this type of equation, and what is missing from it to make it chemically correct?
Generated by claude-sonnet-4-6 · 2026-06-26 00:53 · grounding rag
Model Answer

It is a skeletal chemical equation; it is missing balancing — the number of atoms of each element is not equal on both sides.

Explanation

Examiners expect two things: the term "skeletal chemical equation" (unbalanced equation written using formulae) and the point that it needs to be balanced. The balanced equation is 4Fe + 3O₂ → 2Fe₂O₃. Both parts are needed for full credit.

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