Substances that we use daily can be classified as acids, bases, and neutral substances. For example, lemon juice is acidic, and baking soda solution is basic and common salt is neutral. Lemon juice is acidic since lemon contains citric acid. Similarly, baking soda contains sodium bicarbonate which acts as a base. Sodium chloride is a salt formed by the neutralisation reaction between an acid and a base.
Download Class 7 Chemistry Worksheet on Chapter 5 Acids, Bases and Salts Set 1 PDF
CBSE Class 7 Chemistry Chapter 5 Acids, Bases and Salts Worksheet – Set 1
Q1. What is the common name of sodium bicarbonate?
(a) Antacid
(b) Baking soda
(c) Common salt
(d) Washing soda
Q2. Baking soda turns ______.
(a) Blue litmus red
(b) Red litmus blue
(c) Phenolphthalein colourless
(d) None of the above
Q3. A substance that turns red litmus blue is a/an ______.
(a) Acid
(b) Base
(c) Neutral
(d) None of the above
Q4. A base ______.
(a) Has a bitter taste
(b) Turns blue litmus red
(c) Has a sour taste
(d) Does not affect turmeric
Q5. Salt is formed when ______.
(a) Acid reacts with water
(b) Base reacts with water
(c) Base reacts with acid
(d) All of the above
Q6. Sodium hydroxide is a ______.
Q7. _______ and _______ are used as indicators.
Q8. Grapes contain _______ acid, while apple has _______ acid.
Q9. State true or false.
Excessive use of fertilisers in the soil makes the soil basic.
Q10. State true or false.
Phenolphthalein and methyl orange are examples of indicators.
Q11. Why are antacids used to cure acidity?
Q12. Name any two antacids.
Q13. Why do we use calamine solution on ant bites?
Q14. Why is factory waste neutralised before disposing of?
Q15. What is the chemical name of milk of magnesia?
Q16. What is an indicator?
Q17. What is a universal indicator?
Q18. What is a pH scale?
Q19. Differentiate between acid and base.
Q20. What is a neutralisation reaction? Explain it with the help of an example.
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