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Questions and Answers
Which of the following is an acid-base indicator?
Which of the following is an acid-base indicator?
Turmeric turns red in acidic solutions.
Turmeric turns red in acidic solutions.
False
What color does turmeric turn when mixed with a basic solution?
What color does turmeric turn when mixed with a basic solution?
Red
Turmeric is a natural indicator and changes color in __________ solutions.
Turmeric is a natural indicator and changes color in __________ solutions.
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What substance can Radha use to make the red part of her turmeric-based painting?
What substance can Radha use to make the red part of her turmeric-based painting?
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Match the following substances with their classifications:
Match the following substances with their classifications:
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All indicators will change color when they come into contact with both acids and bases.
All indicators will change color when they come into contact with both acids and bases.
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Which type of solution changes the color of turmeric to yellow?
Which type of solution changes the color of turmeric to yellow?
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Which of the following substances is neutral?
Which of the following substances is neutral?
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Phenolphthalein changes color in acidic solutions.
Phenolphthalein changes color in acidic solutions.
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What is formed as a result of a neutralization reaction?
What is formed as a result of a neutralization reaction?
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The acidic liquid that ants inject when they bite is called _____ acid.
The acidic liquid that ants inject when they bite is called _____ acid.
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Match the following indicators with their characteristics:
Match the following indicators with their characteristics:
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What mistake did Ravi make during the experiment?
What mistake did Ravi make during the experiment?
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Organic manure is used to neutralize the basic nature of the soil.
Organic manure is used to neutralize the basic nature of the soil.
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Name an artificial indicator.
Name an artificial indicator.
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Which of the following indicates that a chemical change occurred during Soha's experiment?
Which of the following indicates that a chemical change occurred during Soha's experiment?
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Neutralization reactions can produce either salt and water or only gas.
Neutralization reactions can produce either salt and water or only gas.
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What products are formed when an acid reacts with a base?
What products are formed when an acid reacts with a base?
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In a neutralization reaction, heat is produced, causing the test tube to become _____.
In a neutralization reaction, heat is produced, causing the test tube to become _____.
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What does Y represent if the solution turns pink when phenolphthalein is added?
What does Y represent if the solution turns pink when phenolphthalein is added?
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Match the following terms with their definitions:
Match the following terms with their definitions:
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Blue litmus paper turns red in acidic solutions.
Blue litmus paper turns red in acidic solutions.
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What is the result of mixing hydrochloric acid with sodium hydroxide?
What is the result of mixing hydrochloric acid with sodium hydroxide?
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Which of the following can be consumed to relieve acidity in the stomach?
Which of the following can be consumed to relieve acidity in the stomach?
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Phenolphthalein is a natural indicator.
Phenolphthalein is a natural indicator.
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What should be added to overly basic soil to improve its quality?
What should be added to overly basic soil to improve its quality?
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Toothpaste neutralizes the acid produced by the fermentation of food particles due to its ______ nature.
Toothpaste neutralizes the acid produced by the fermentation of food particles due to its ______ nature.
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What is the main reason for taking an antacid tablet when experiencing acidity?
What is the main reason for taking an antacid tablet when experiencing acidity?
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Calamine solution can be used to treat ant stings due to its alkaline properties.
Calamine solution can be used to treat ant stings due to its alkaline properties.
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Why is hydrochloric acid present inside the human body?
Why is hydrochloric acid present inside the human body?
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Match the following substances with their uses:
Match the following substances with their uses:
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What is the main cause of the burning pain that Nitesh experienced?
What is the main cause of the burning pain that Nitesh experienced?
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Baking soda is a strong acid that can help neutralize other acids.
Baking soda is a strong acid that can help neutralize other acids.
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What values do Nitesh's friends demonstrate when they call his mother after he gets stung?
What values do Nitesh's friends demonstrate when they call his mother after he gets stung?
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Rahul remembered his teacher's statement about hydrochloric acid's role in the stomach, which helps in the digestion of __________.
Rahul remembered his teacher's statement about hydrochloric acid's role in the stomach, which helps in the digestion of __________.
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Match the following actions with the corresponding reasons:
Match the following actions with the corresponding reasons:
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Which acid is responsible for helping us digest food?
Which acid is responsible for helping us digest food?
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Adding lime to acidic soil will decrease its pH level.
Adding lime to acidic soil will decrease its pH level.
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What is the likely reason for fish dying in the pond observed by Kishan?
What is the likely reason for fish dying in the pond observed by Kishan?
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The substance 'Y' prescribed for indigestion, which contains magnesium hydroxide, is known as __________.
The substance 'Y' prescribed for indigestion, which contains magnesium hydroxide, is known as __________.
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Match the following remedies with their effects:
Match the following remedies with their effects:
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What can be added to acid waste to neutralize it?
What can be added to acid waste to neutralize it?
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Using too many fertilizers can lead to acidic soil.
Using too many fertilizers can lead to acidic soil.
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What compound is added to neutralize excess acidity in soil?
What compound is added to neutralize excess acidity in soil?
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Study Notes
Worksheet 3: Turmeric Indicator
- Acid-base indicator: Turmeric is an acid-base indicator.
- Turmeric analogy: Turmeric is an indicator, milk of magnesia is a base, baking soda is a base.
- Turmeric pH determination: You can determine the concentration of acids/bases using a pH scale.
- Turmeric colour change: Yellow in acid, red/yellow in base.
- Household item for red pigment: Soap solution/baking soda.
Worksheet 3: Acid-Base Indicator Properties
- Acid/base colour change: Both acids and bases change the colours of all indicators. However, an indicator only changes colour with one or the other (acid or base), not both.
- Indicator change colour: Change in colour of an indicator depends on the type of indicator.
- Turmeric as a natural indicator: Turmeric is a natural indicator, turning orange-red in alkaline solution.
Worksheet 4: China Rose Indicator
- Natural indicator: China rose petals are a natural indicator for acids and bases.
- Acidic/basic changes: Turns green in a basic solution, dark pink in acidic conditions and light pink in neutral conditions.
- Identifying substances: Using China rose indicator, a magenta colour shows a sugar solution, a colourless colour shows lime juice and a green colour shows lime water.
Worksheet 5: pH Value of Acid and Bases
- Acidity/basicity testing: Fill the table according to observations for different samples regarding pH paper colour and the pH, using pH paper to test the acidity and basicity of substances..
Worksheet 6: Neutralization Reactions
- Neutralization: The reaction between an acid and a base, forming salt and water.
- Neutralization reaction observation: When a colourless acid and base solutions are mixed, the resultant solution becomes warm, and no gas bubbles are formed.
- Neutralization change: The resultant solution is neutral.
- Acid/base mix observations: When an acid-base is mixed, the substances neutralise each other and are no longer acidic or basic, forming salt and water.
Worksheet 7: Neutralization in Everyday Life
- Acidity relief: Lime water is a good option for relieving stomach acid.
- Neutralizing agents: Baking soda (a mild base) is useful to neutralize excess acid in the stomach, providing relief from indigestion.
- Acidic/basic soil: Adding lime (a base) to acidic soil neutralizes it, which is good for the growth of plants.
- Acid and base nature of substances: pH value determines the acidity or basicity of substances (pH less than 7 is acid, pH more than 7 is base and pH 7 is neutral)
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Description
Test your knowledge on acid-base indicators, their properties, and how they change colors in different solutions. This quiz covers everything from natural indicators like turmeric to artificial ones. Perfect for chemistry enthusiasts and students alike!
