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Questions and Answers
What is the nature of substances that turn blue litmus to red litmus?
What is the nature of substances that turn blue litmus to red litmus?
- Acidic (correct)
- Basic
- Neutral
- Alkaline
What is the sensation caused by when bitten by an ant?
What is the sensation caused by when bitten by an ant?
- Prickling sensation
- Burning sensation (correct)
- Itching sensation
- Tingling sensation
What is the nature of oxides of magnesium when dissolved in water?
What is the nature of oxides of magnesium when dissolved in water?
- Acidic
- Neutral
- Basic (correct)
- Insoluble
What is the formula for magnesium hydroxide?
What is the formula for magnesium hydroxide?
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What is the characteristic of basic substances?
What is the characteristic of basic substances?
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Study Notes
Acidic and Basic Substances
- Substances that turn blue litmus paper red are acidic.
- Substances that turn red litmus paper blue are basic.
- Neutral substances do not change the color of either red or blue litmus paper.
Natural Acids
- Formic acid, released by ant bites, causes a burning sensation.
- Natural acids are found in plants and animals and are part of everyday life.
Mineral Acids
- Common mineral acids include hydrochloric acid, sulfuric acid, and nitric acid.
- These are synthetically prepared from minerals.
Basic Substances
- Basic substances feel soapy to the touch.
- Oxides such as magnesium oxide, potassium oxide, and sodium oxide are basic when dissolved in water, forming hydroxides.
- Magnesium oxide specifically forms magnesium hydroxide in water.
Chemical Formula
- The formula for magnesium hydroxide is Mg(OH)â‚‚.
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