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Class 7 Science: Exploring Substances Acidic Basic and Neutral Worksheet (with Answers)

A free, print-ready worksheet on Exploring Substances Acidic Basic and Neutral for CBSE Class 7 Science, with a matching answer key. Use the sample below, or build your own with the exact mix of questions you need — no login, no ads.

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Sample worksheet

7 of 17 questions from this chapter. Generate your own for the full set, more variations, and a clean print layout.

  1. 1. Acids generally taste:
    • (a) sour
    • (b) sweet
    • (c) salty
    • (d) bitter
  2. 2. Blue litmus turns ___ in an acid.
    • (a) green
    • (b) red
    • (c) blue
    • (d) yellow
  3. 3. A substance that is neither acidic nor basic is:
    • (a) sour
    • (b) bitter
    • (c) neutral
    • (d) an indicator
  4. 4. Red litmus turns blue in a:
    • (a) acid
    • (b) neutral solution
    • (c) salt only
    • (d) base
  5. 5. How does litmus behave in acids and bases?
  6. 6. What is neutralisation?
  7. 7. Compare the properties of acids and bases, and explain how indicators detect them.
View answers
  1. 1. (a) sour — Acids are typically sour.
  2. 2. (b) red — Acids turn blue litmus red.
  3. 3. (c) neutral — It is neutral, like pure water.
  4. 4. (d) base — Bases turn red litmus blue.
  5. 5. It turns red in acids and blue in bases.
  6. 6. The reaction of an acid with a base to form salt and water.
  7. 7. Acids and bases have contrasting properties. Acids generally taste sour (like lemon and vinegar) and turn blue litmus red, while bases taste bitter, feel slippery (like soap and baking soda solution) and turn red litmus blue. Because tasting unknown substances is unsafe, we detect acids and bases using indicators — substances that change colour depending on the nature of what they touch. Litmus is the most common, but natural indicators also work: turmeric stays yellow in acids but turns red in bases, and china rose and red cabbage juice change colour too. A neutral substance, such as pure water, does not change the colour of litmus.
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Does the Exploring Substances Acidic Basic and Neutral worksheet come with answers?
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Which board and class is this for?
This worksheet is aligned to CBSE Class 7 Science, chapter “Exploring Substances Acidic Basic and Neutral”.