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Class 7 Exam  >  Class 7 Tests  >  Test: Exploring Substances: Acidic, Basic, and Neutral - Class 7 MCQ

Test: Exploring Substances: Acidic, Basic, and Neutral - Class 7 MCQ


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10 Questions MCQ Test - Test: Exploring Substances: Acidic, Basic, and Neutral

Test: Exploring Substances: Acidic, Basic, and Neutral for Class 7 2025 is part of Class 7 preparation. The Test: Exploring Substances: Acidic, Basic, and Neutral questions and answers have been prepared according to the Class 7 exam syllabus.The Test: Exploring Substances: Acidic, Basic, and Neutral MCQs are made for Class 7 2025 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Exploring Substances: Acidic, Basic, and Neutral below.
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Test: Exploring Substances: Acidic, Basic, and Neutral - Question 1
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What is litmus and where is it obtained from?

Detailed Solution for Test: Exploring Substances: Acidic, Basic, and Neutral - Question 1
  • Litmus is a natural material obtained from lichens, which are a combination of fungus and algae.
  • Lichens grow on rocks and trees, especially in rainy and clean areas.
  • Litmus is used in the form of blue and red paper strips to test if a substance is acidic or basic.
Test: Exploring Substances: Acidic, Basic, and Neutral - Question 2
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What happens when an acidic substance is tested with blue litmus paper?

Detailed Solution for Test: Exploring Substances: Acidic, Basic, and Neutral - Question 2
  • Acids turn blue litmus paper red.
  • This color change helps identify the acidic nature of a substance.
  • For example, lemon juice, which is acidic, turns blue litmus paper red.
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Test: Exploring Substances: Acidic, Basic, and Neutral - Question 3
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What is a common property of bases?

Detailed Solution for Test: Exploring Substances: Acidic, Basic, and Neutral - Question 3
  • Bases often feel slippery or soapy to the touch, similar to soap or baking soda solutions.
  • This slippery feel helps identify bases compared to acids and neutral substances.
  • Bases usually taste bitter, but not all bitter substances are bases.
Test: Exploring Substances: Acidic, Basic, and Neutral - Question 4
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How does red rose extract behave as an indicator?
Detailed Solution for Test: Exploring Substances: Acidic, Basic, and Neutral - Question 4
  • Red rose extract changes color depending on the solution’s nature.
  • It turns red in acidic substances like lemon juice and green in basic substances like soap solution.
  • Neutral substances do not change its color.
Test: Exploring Substances: Acidic, Basic, and Neutral - Question 5
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What is a limitation of turmeric paper as an indicator?
Detailed Solution for Test: Exploring Substances: Acidic, Basic, and Neutral - Question 5
  • Turmeric paper turns red in the presence of bases but remains yellow with acidic or neutral substances.
  • Therefore, turmeric paper cannot distinguish between acids and neutrals.
  • This limits its use compared to other indicators like litmus or red rose extract.
Test: Exploring Substances: Acidic, Basic, and Neutral - Question 6
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What happens to the smell of a cloth soaked in onion juice when it comes in contact with acidic or basic substances?
Detailed Solution for Test: Exploring Substances: Acidic, Basic, and Neutral - Question 6
  • Olfactory indicators like onion juice change smell when mixed with acids or bases.
  • For example, the cloth soaked in onion juice loses its smell when exposed to tamarind water (acidic) or baking soda solution (basic).
  • This property helps identify acids and bases by smell.
Test: Exploring Substances: Acidic, Basic, and Neutral - Question 7
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What is the process called when an acid and a base react to form a neutral substance?
Detailed Solution for Test: Exploring Substances: Acidic, Basic, and Neutral - Question 7
  • Neutralization is the reaction between an acid and a base producing salt, water, and heat.
  • This process balances the properties of acids and bases, creating a neutral solution.
  • It is important in many real-life applications, such as treating ant bites and soil.
Test: Exploring Substances: Acidic, Basic, and Neutral - Question 8
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How does neutralization help in treating an ant bite?
Detailed Solution for Test: Exploring Substances: Acidic, Basic, and Neutral - Question 8
  • Ant bites inject formic acid causing redness and stinging pain.
  • Applying baking soda, a base, neutralizes the acid, reducing pain and swelling.
  • This practical use of neutralization helps in everyday first aid.
Test: Exploring Substances: Acidic, Basic, and Neutral - Question 9
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Why do farmers add lime to acidic soil?
Detailed Solution for Test: Exploring Substances: Acidic, Basic, and Neutral - Question 9
  • Excessive use of fertilizers can make soil acidic, which is harmful to plants.
  • Adding lime, a base, neutralizes the acidic soil, making it suitable for healthy plant growth.
  • This demonstrates the importance of chemical balance in agriculture.
Test: Exploring Substances: Acidic, Basic, and Neutral - Question 10
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What color changes occur in hydrangea flowers based on soil acidity?
Detailed Solution for Test: Exploring Substances: Acidic, Basic, and Neutral - Question 10
  • Hydrangea flowers turn blue in acidic soil.
  • In basic soil, these flowers appear pink or red.
  • This natural change shows how acidity and basicity affect living organisms.
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