Acid, base, and salt play a crucial role in our life. The liquid present in the stomach responsible for digestion is hydrochloric acid. The soap we use for washing our hands is a base. Moreover, the common salt that we add to food is sodium chloride.
An acid is a sour substance that turns blue litmus red, whereas a base is a bitter substance that turns red litmus blue. In contrast, salt is a substance formed by the reaction of acid and base.
Download Class 7 Chemistry Worksheet on Chapter 5 Acids, Bases and Salts Set 2 PDF
CBSE Class 7 Chemistry Chapter 5 Acids, Bases and Salts Worksheet – Set 2
Q1. Window cleaner contains ______.
(a) Magnesium hydroxide
(b) Ammonium hydroxide
(c) Calcium hydroxide
(d) None of the above
Q2. Tamarind, grapes and unripe mangoes contain _______.
(a) Tartaric acid
(b) Citric acid
(c) Ascorbic acid
(d) Both (b) and (c )
Q3. What is the chemical name of baking soda?
(a) Potassium hydrogen carbonate
(b) Magnesium hydrogen carbonate
(c) Sodium hydrogen carbonate
(d) None of the above
Q4. What is the effect of aerated drinks or soda water on the china rose indicator?
(a) Light pink to green
(b) Light pink to magenta
(c) Green to light pink
(d) Magenta to light pink
Q5. Excessive use of fertilisers in the land makes the land _______.
(a) Acidic
(b) Alkaline
(c) Neutral
(d) All of the above
Q6. State true or false.
Acid turns blue litmus red.
Q7. State true or false.
Acetic acid is present in vinegar, whereas citrus fruits contain citric acid.
Q8. State true or false.
Antacids are acidic substances.
Q9. Bases are _____ to touch.
Q10. Mineral acids are ______ acids.
Q11. What is a base?
Q12. What are indicators? Name two acid-base indicators.
Q13. What will happen if a drop of hydrochloric acid is added to the blue litmus solution?
Q14. Name the following:
(a) The acid present in car batteries.
(b) Strong and weak acid.
Q15. Name any three acids found in fruits.
Q16. An equal amount of acidic and basic substances are mixed.
(a) What is the name of the reaction?
(b) What product is formed?
Q17. Why does a turmeric stain on a white shirt turn red when it is washed with soap?
Q18. Why should we treat factory wastes before discharging them into water bodies?
Q19. What happens when acidic soil is treated with purple cabbage juice?
Q20. What is soil treatment?
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