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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
When zinc granules are added to dilute sulphuric acid, bubbles are observed and the container becomes warm. Which TWO indicators from this observation confirm that a chemical reaction has taken place?
Generated by claude-sonnet-4-6 · 2026-06-26 00:53 · grounding rag
Model Answer

Evolution of bubbles (gas produced) and the container becoming warm (heat released/exothermic reaction) confirm that a chemical reaction has taken place.

Explanation

CBSE expects students to name the two observable indicators: production of gas (bubbles of hydrogen) and change in temperature (heat released). Both are standard signs of a chemical reaction from Chapter 1. No equation is needed 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.