Class 7 Exam > Class 7 Notes > Science Class 7 > Worksheet: Acids, Base & Salts
Acids, Bases and Salts Class 7 Worksheet Science Chapter 2
Q.1. True/False
(i) Nitric acid turns red litmus blue.
(ii) Sodium hydroxide turns blue litmus red.
(iii) Sodium hydroxide and hydrochloric acid neutralise each other and form salt and water.
(iv) Indicator is a substance which shows different colours in acidic and basic solutions.
(v) Tooth decay is caused by the presence of a base.
(vi) If an indicator changes colour with a base, it does not change colour with an acid.
Q.2. Fill in the blanks.
(i) Change of colour in an acid and a base depends on the type of the ____.
(ii) Acid turns ____ litmus red.
(iii) Bases turn ___ litmus blue.
(iv) Litmus has a ____ colour in distilled water.
(v) In neutralisation reaction a new substance is formed. This is called ____.
(vi) Lemon juice is ____ in nature.
Q.3. Why curd, lemon juice, orange juice and vinegar taste sour?
Q.4. Tom rubs a solution between fingers and feels soapy, what is the nature of that solution?
Q.5. What do you mean by neutral solution? Give examples.
Q.6. How does rain become acidic?
Q.7. State few properties of acids.
Q.8. Which acid is present in an ant sting?
Q.9. What is the nature of distilled water?
Q.10. Where does the word acid come from?
Q.11. Which is the most commonly used natural indicator?
Q.12. Name the acid which is present in each cell of our body.
Q.13. Blue litmus paper is dipped in a solution. It remains blue. What is the nature of the solution? Explain.
Q.14. Is the distilled water acidic/basic/neutral? How would you verify it?
Q.15. Why factory waste is neutralised before disposing it into the water bodies?
Q.16. What is acid rain?
Q.17. What is the role of hydrochloric acid in the stomach?
Q.18. Hydrochloric acid (HCl) helps us to digest food.
Q.19. What is the effect of the China rose indicator on acidic and basic solutions?
Q.20. Why a turmeric stain on my white shirt is turned to red when it is washed with soap.
You can find Worksheets Solutions here: Worksheet Solutions: Acids, Base & Salts
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FAQs on Acids, Bases and Salts Class 7 Worksheet Science Chapter 2
| 1. What are acids and bases? |  |
Ans. Acids are substances that release hydrogen ions (H+) when dissolved in water, while bases are substances that release hydroxide ions (OH-) when dissolved in water. Acids have a sour taste, turn blue litmus paper red, and have a pH less than 7. Bases have a bitter taste, turn red litmus paper blue, and have a pH greater than 7.
| 2. How do acids and bases react with each other? | |
Ans. When an acid and a base react with each other, they undergo a neutralization reaction. The hydrogen ions (H+) from the acid combine with the hydroxide ions (OH-) from the base to form water (H2O). The remaining ions combine to form a salt.
| 3. What is the importance of acids, bases, and salts in everyday life? | |
Ans. Acids, bases, and salts play a crucial role in various aspects of our daily lives. Acids are used in the production of fertilizers, cleaning products, and food preservation. Bases are used in cleaning agents, soaps, and pharmaceuticals. Salts are used as food additives, water softeners, and in various industrial processes.
| 4. How can we identify acids and bases? | |
Ans. Acids can be identified by their sour taste, ability to turn blue litmus paper red, and their pH value less than 7. Bases can be identified by their bitter taste, ability to turn red litmus paper blue, and their pH value greater than 7. Additionally, pH indicators such as universal indicator paper or pH meters can be used to determine the acidity or basicity of a substance.
| 5. Can acids and bases be found in nature? | |
Ans. Yes, acids and bases can be found in nature. Examples of natural acids include citric acid in citrus fruits, acetic acid in vinegar, and hydrochloric acid in the stomach. Natural bases include sodium hydroxide in lye, magnesium hydroxide in milk of magnesia, and ammonia in cleaning products.
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