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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 thorough-understanding
During a chemical reaction, the total mass of reactants is found to equal the total mass of products. How does this observation make it compulsory to balance a chemical equation? Name the law that governs this.
Generated by claude-sonnet-4-6 · 2026-06-26 00:53 · grounding rag
Model Answer

Since mass is conserved (Law of Conservation of Mass), the number of atoms of each element must be equal on both sides, making it compulsory to balance a chemical equation.

Explanation

The examiner expects you to link mass conservation directly to the need for balancing. Name the law clearly. One crisp sentence is sufficient for 1 mark.

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