---
title: "NCERT Solutions for Class 7 Science Chapter 2 Exercise 2.2"
url: https://www.swavid.com/science/class/7/chapter/exploring-substances-acidic-basic-and-neutral/ncert-solutions/exercise-2-2
dateModified: 2026-10-07T16:06:22+00:00
---

# NCERT Solutions for Class 7 Science Chapter 2 Exercise 2.2

Chapter 2: Exploring Substances: Acidic, Basic, and Neutral. Every question from Exercise 2.2, with full working and the final answer.

Free PDF (16 pages): https://www.swavid.com/api/seo/pdf/ncert/science/class-7/swavid-ncert-solutions-class-7-science-chapter-2-exploring-substances-acidic-basic-and-neutral-13aedb74b7.pdf

## Activity 2.2: Let us relate and explore

### Question 1

*3 marks · Short answer*

Find out and write the names of the most common acids present in the following substances— Lemon________, Curd________, Tamarind________, Vinegar________.

**Part (i)**

1. Refer to Fig. 2.4 showing common acids in edible substances.
2. Lemon contains citric acid.

Answer (i): Citric acid

**Part (ii)**

1. Refer to Fig. 2.4 showing common acids in edible substances.
2. Curd contains lactic acid.

Answer (ii): Lactic acid

**Part (iii)**

1. Refer to Fig. 2.4 showing common acids in edible substances.
2. Tamarind contains tartaric acid.

Answer (iii): Tartaric acid

**Part (iv)**

1. Refer to Fig. 2.4 showing common acids in edible substances.
2. Vinegar contains acetic acid.

Answer (iv): Acetic acid

**Answer:** Lemon: Citric acid, Curd: Lactic acid, Tamarind: Tartaric acid, Vinegar: Acetic acid

> Common mistake: Confusing tartaric acid of tamarind with citric acid of lemon.

### Question 2

*2 marks · Very short answer*

Rub the baking soda solution between your fingers. What do you observe?

**Solution**

1. Rubbing baking soda solution between the fingers shows its touch property.
2. It feels soapy or slippery, which is a general characteristic of basic substances.

**Answer:** It feels soapy or slippery to touch.

> Common mistake: Describing the taste instead of the touch property when asked about rubbing between fingers.

## Related pages

- [All Chapter 2 NCERT solutions](https://www.swavid.com/science/class/7/chapter/exploring-substances-acidic-basic-and-neutral/ncert-solutions)
- [Exercise 2.1](https://www.swavid.com/science/class/7/chapter/exploring-substances-acidic-basic-and-neutral/ncert-solutions/exercise-2-1)
- [Exercise 2.4](https://www.swavid.com/science/class/7/chapter/exploring-substances-acidic-basic-and-neutral/ncert-solutions/exercise-2-4)
- [Exercise 2.5](https://www.swavid.com/science/class/7/chapter/exploring-substances-acidic-basic-and-neutral/ncert-solutions/exercise-2-5)
- [Exercise 2.6](https://www.swavid.com/science/class/7/chapter/exploring-substances-acidic-basic-and-neutral/ncert-solutions/exercise-2-6)
- [Exercise 2.7](https://www.swavid.com/science/class/7/chapter/exploring-substances-acidic-basic-and-neutral/ncert-solutions/exercise-2-7)

Solutions written by SwaVid, a personal AI tutor for Class 6 to 10 Maths and Science. Practise this chapter free: https://www.swavid.com/start/student