Are these practice questions for Exploring Substances: Acidic, Basic, and Neutral based on the CBSE pattern?

Yes. Every practice question is modeled on the CBSE Class 7 Science exam pattern — including MCQs, assertion-reason questions, and short-answer formats that frequently appear in CBSE papers.

Are the practice questions for Exploring Substances: Acidic, Basic, and Neutral free?

Yes. Every chapter includes free practice questions for Class 7 students to get you started.

What types of questions are included?

The practice set for Exploring Substances: Acidic, Basic, and Neutral mainly includes MCQs and CBSE-style short-answer questions, with instant feedback on each answer. For full-length textbook practice, use the NCERT Solutions page.

Are the practice questions suitable for board exam preparation?

Yes. The questions test the same concepts and depth that CBSE asks in board exams. After finishing, also solve the NCERT and NCERT Exemplar exercises for Exploring Substances: Acidic, Basic, and Neutral for full coverage.

How many practice questions are there for Exploring Substances: Acidic, Basic, and Neutral?

The number scales with chapter length and concept density. Each chapter typically has 15-50 practice questions across MCQ and short-answer formats.

Exploring Substances: Acidic, Basic, and Neutral Class 7 Science Practice Questions with Answers

easy

Analyze the results of testing an unknown solution with both red and blue litmus paper, where the red litmus paper turns blue, and the blue litmus paper remains blue. What can you conclude about the nature of the solution?

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easy

Demonstrate how the concept of neutralization can be applied to alleviate the stinging sensation caused by an ant bite. Explain the chemical reaction involved.

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easy

Identify the color change that occurs when turmeric paper comes in contact with a basic solution.

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easy

Examine the scenario where a farmer observes that their soil is too acidic for optimal plant growth. Apply your knowledge of neutralization to suggest a suitable remedy and explain how it works at a chemical level.

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easy

A student finds that a solution turns blue litmus red but does not affect turmeric paper. Critique this observation and determine the possible nature of the solution.

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easy

Define an acid-base indicator.

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easy

Name two substances that are commonly found in the laboratory that are acidic in nature.

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easy

Name the acid present in vinegar.

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easy

List three examples of natural acid-base indicators.

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easy

A farmer notices that the soil in their field is too basic. Propose two different organic remedies they could use to neutralize the soil.

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easy

List three uses of neutralization in daily life.

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easy

Recall the name of the scientist known as the 'Father of Modern Indian Chemistry'.

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easy

Analyze the information: A solution turns blue litmus red but does not change the color of turmeric paper. What can you infer about the nature of this solution, and why?

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easy

Examine the process of preparing lime water. Why is it important to filter the solution after mixing lime (calcium oxide) with water?

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easy

Define the term 'neutral substance'. Give two examples.

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medium

Explain what happens during a neutralization reaction.

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medium

Propose a method to determine whether an unknown soil sample is acidic, basic, or neutral, using only materials commonly found in a kitchen.

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medium

Justify why distilled water is considered neutral, even though it contains both

H^+

and

OH^-

ions.

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medium

Design an experiment to investigate how the color of hydrangea flowers changes with varying pH levels of the soil. Outline the steps and expected results.

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medium

You have three solutions: vinegar (acidic), baking soda solution (basic), and sugar solution (neutral). Describe how you would use red litmus paper to identify each solution.

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medium

Explain why a farmer might add lime to their soil.

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medium

Evaluate the claim that olfactory indicators are more advantageous than visual indicators (like litmus paper) in identifying acids and bases for individuals with visual impairments. Justify your reasoning.

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medium

Design an experiment to demonstrate the neutralization reaction between hydrochloric acid (

HCl

) and sodium hydroxide (

NaOH

) using phenolphthalein as an indicator. Include safety precautions.

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medium

Evaluate the statement: 'All substances that taste sour are acidic.' Justify your answer with examples.

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medium

Summarize the effect of an ant bite and how it can be neutralized.

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medium

Contrast the behavior of acidic and basic substances when mixed with olfactory indicators. Give an example of an olfactory indicator and describe how its odor changes in the presence of an acid and a base.

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medium

Recall the formula of the product formed when hydrochloric acid (

HCl

) reacts with sodium hydroxide (

NaOH

).

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medium

Compare and contrast the color changes observed when lemon juice and soap solution are separately added to red rose extract. What do these color changes indicate about the nature of each substance?

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medium

Design a 'color-changing greeting card' using natural indicators to reveal a hidden message when sprayed with a specific solution. Describe the materials and solutions you would use.

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medium

Explain how the color of hydrangea flowers is related to the pH of the soil. Contrast the conditions that lead to blue flowers versus pink or red flowers.

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medium

Apply your understanding of acid-base indicators to design an experiment to test the acidity or basicity of three unknown household solutions using turmeric paper. Describe the steps involved and the expected observations for each type of solution.

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medium

Describe how litmus paper is used to identify acidic and basic substances.

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medium

Formulate a hypothesis regarding the change in pH of rainwater in an industrial area compared to a rural area. Justify your prediction.

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medium

What are olfactory indicators? Give one example.

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medium

Analyze the potential environmental impact of releasing untreated acidic factory waste into a lake. Propose a method, based on neutralization, to mitigate this impact.

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medium

Apply the concept of acid-base indicators to explain why a curry stain on a white shirt changes color upon applying soap.

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medium

Describe how red rose extract behaves in acidic and basic solutions.

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medium

Create a flowchart illustrating the steps to identify three unknown solutions (acidic, basic, and neutral) using red litmus paper, blue litmus paper, and turmeric paper.

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hard

Formulate a plan to test the acidity of various fruit juices using a digital pH meter and compare the results with those obtained using red cabbage extract. Evaluate the accuracy and reliability of both methods.

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hard

A student mixes

50 \text{ mL}

of a solution with

pH = 2

with

50 \text{ mL}

of a solution with

pH = 12

. Assuming complete neutralization, calculate the approximate

pH

of the resulting solution. Justify your answer.

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hard

Evaluate the effectiveness of using red rose extract as an indicator compared to litmus paper for distinguishing between strong and weak acids. Justify your answer.

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hard

Critique the following statement: 'A strong acid is always more corrosive than a weak base.'

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hard

Calculate the volume of

0.1 \text{ M}

hydrochloric acid (

HCl

) required to completely neutralize

20 \text{ mL}

of

0.05 \text{ M}

sodium hydroxide (

NaOH

) solution.

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hard

A solution 'A' turns blue litmus red, and a solution 'B' turns turmeric paper red. If you mix equal volumes of 'A' and 'B', predict the likely pH of the resulting mixture and justify your answer.

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hard

Propose a method to create a pH scale using natural indicators like red cabbage extract and turmeric. Explain how you would calibrate the scale.

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Exploring Substances: Acidic, Basic, and NeutralClass 7 Science Practice Questions