Acids are chemical substances that are sour, turn blue litmus red, and have a pH value of less than seven, whereas bases are chemical substances that are bitter, turn red litmus blue, and have a pH value of more than seven. On the other hand, salt is a substance formed by the reaction of acid and base, with a pH value of seven.
Download Class 7 Chemistry Worksheet on Chapter 5 Acids, Bases and Salts Set 3 PDF
CBSE Class 7 Chemistry Chapter 5 Acids, Bases and Salts Worksheet – Set 3
Q1. Which of the following is acidic?
(a) Tomato juice
(b) Milk
(c) Both (a) and (b)
(d) None of the above
Q2. What is the common name of slaked lime?
(a) Sodium hydrogen carbonate
(b) Magnesium hydrogen carbonate
(c) Potassium hydrogen carbonate
(d) None of the above
Q3. Which of the following is a natural indicator?
(a) Turmeric
(b) China rose
(c) Litmus
(d) All of the above
Q4. What is the colour of the phenolphthalein indicator in acidic and basic solutions?
(a) Pink and magenta
(b) Colourless and pink
(c) Magenta and colourless
(d) None of the above
Q5. Vinegar contains ______ acid.
(a) Acetic acid
(b) Malic acid
(c) Tartaric acid
(d) None of the above
Q6. Match the items of column A with those of column B.
| Column A | Column B |
|---|---|
| Slaked lime | Sodium hydrogen carbonate |
| NaCl | Used in whitewashing |
| Baking soda | Common salt |
| Milk | Acetic acid |
| Vinegar | Lactic acid |
Q7. A pH value less than ______ indicates an acid.
Q8. A/an ______ turns red litmus blue.
Q9. Apple contains _______ acid.
Q10. ________ is the common name for sodium bicarbonate.
Q11. Explain the neutralisation reaction with an example.
Q12. What is acid rain?
Q13. What is the natural colour of litmus?
Q14. Which chemicals can be added to the acidic soil to make it neutral?
Q15. Why is toothpaste alkaline?
Q16. What will happen when a drop of dilute sulphuric acid is added to the china rose indicator?
Q17. You are given a solution of a base. What is its effect on the following?
(a) Red litmus
(b) Blue litmus
(c) China rose indicator
(d) Turmeric indicator
Q18. How can you cure an ant sting?
Q19. Explain the preparation of the china rose indicator. What happens when it is added to an acidic and basic solution?
Q20. Why does a farmer add quicklime in the field?
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