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Download NCERT Book Class 7 Science (Curiosity) Chapter 2 Exploring Substances: Acidic, Basic, and Neutral (PDF · 16 pages)About NCERT Book Class 7 Science (Curiosity) Chapter 2 Exploring Substances: Acidic, Basic, and Neutral
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NCERT Book Class 7 Science (Curiosity) Chapter 2 Exploring Substances: Acidic, Basic, and Neutral – Text
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Page 1
2 Substances: Acidic,
Basic, and Neutral
On 28 February, the school hosted a science fair to celebrate
National Science Day. At the entry gate, siblings Ashwin and
Keerthi were greeted with a white sheet of paper. They were
curious to know why a white sheet of paper was given to them!
A few steps ahead, there was a volunteer spraying a liquid
on these sheets of paper. The siblings also got their white sheets
sprayed. To their surprise, the words ‘Welcome to the Wonderful
World of Science’ appeared on the papers the moment the liquid
was sprayed (Fig. 2.1). They were excited and eager to know how
this happened and the reason behind it.
Their curiosity was partly satisfied at the ‘Colourful World
of Substances’ stall. They saw many activities showing colour
changes on mixing different substances. They decided to explore
these changes further. Let us join them on this learning adventure.
Fig. 2.1: Scene of a science fair
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Document Details
| Board / Org | NCERT |
| Exam | Class 7 |
| Type | Books |
| Pages | 16 |
| Language | english |
| Updated | 24 Sep 2026 |