Worksheets › Class 7 › Exploring Substances: Acidic, Basic, and Neutral
Class 7 Exploring Substances: Acidic, Basic, and Neutral worksheet
CBSE Science. Litmus, turmeric and rose indicators, acids in foods, neutralisation and its uses. Every sheet has 20 questions in three sections and an answer key, and the numbers change every time.
Sample questions
Real questions from this chapter, as the app sets them. Tap Answer to see the answer and working.
Section A · multiple choice
- 1.
Litmus is obtained from:
- rose petals
- cabbage
- turmeric
- lichens
Answer
(d) lichens
a fungus and an alga living together
- 2.
Which of these is BASIC?
- baking soda solution
- sugar solution
- salt solution
- curd
Answer
(a) baking soda solution
- 3.
Which of these is ACIDIC?
- tap water
- salt solution
- soap solution
- amla juice
Answer
(d) amla juice
Section B · short answer
- 4.
What is an acid-base indicator? Give two examples.
Answer
A substance that shows by its colour whether something is acidic or basic; litmus and turmeric.
- 5.
Is each "acidic", "basic" or "neutral"? (a) washing powder solution (b) tap water
Answer
(a) basic (b) neutral
Section C · long answer
- 6.
Describe an activity to show neutralisation using lemon juice, lime water and litmus.
Answer
Add blue litmus solution to dilute lemon juice: it turns red (acid). Add lime water drop by drop and stir: at one point the colour changes back to blue, showing the acid has been neutralised by the base, forming salt and water and giving out heat.
Fresh sheets for your child
In the app, every Exploring Substances: Acidic, Basic, and Neutral sheet is new: the app remembers the questions your child has already had and leaves them out. Print the sheet as a PDF, or use notebook mode and write the answers in a notebook.
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