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Class 7 Science Chapter 2 Infographics - Acids, Base and Salts
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FAQs on Class 7 Science Chapter 2 Infographics - Acids, Base and Salts
| 1. What are the main properties of acids? |  |
Ans. Acids are substances that typically have a sour taste, can conduct electricity when dissolved in water, and turn blue litmus paper red. They release hydrogen ions (H⁺) in solution and have a pH less than 7.
| 2. How do bases differ from acids? | |
Ans. Bases are substances that generally taste bitter, feel slippery, and can turn red litmus paper blue. They release hydroxide ions (OH⁻) in solution and have a pH greater than 7. Unlike acids, they do not donate protons but accept them.
| 3. What is the role of salts in chemical reactions? | |
Ans. Salts are formed when acids react with bases, resulting in a neutralization reaction. They can act as electrolytes in solutions, enabling the conduction of electricity, and can also participate in various chemical reactions, including precipitation and buffering.
| 4. Can you give examples of common acids, bases, and salts? | |
Ans. Common acids include hydrochloric acid (HCl), sulfuric acid (H₂SO₄), and acetic acid (CH₃COOH). Common bases are sodium hydroxide (NaOH), potassium hydroxide (KOH), and ammonia (NH₃). Examples of salts include sodium chloride (NaCl), potassium sulfate (K₂SO₄), and magnesium nitrate (Mg(NO₃)₂).
| 5. What is the significance of the pH scale in understanding acids and bases? | |
Ans. The pH scale measures the acidity or basicity of a solution, ranging from 0 to 14. A pH less than 7 indicates an acidic solution, a pH of 7 is neutral, and a pH greater than 7 indicates a basic solution. Understanding pH is crucial in various fields such as chemistry, biology, and environmental science, as it affects chemical reactions and biological processes.
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