Important Questions for CBSE Class 7 Science Chapter 4 - Acids, Bases and Salts

Refer To Page 1  For 1 Mark Questions In The PDF

Very Short Answer Questions (1 mark)

Fill in the blanks:

1. ______are sour in taste.
   Ans:  Acids are sour in taste.

2. 2. Bases are ______in taste.
   Ans: Bases are Bitter in taste. 

3. _______ are soapy to touch.
   Ans: Bases are soapy to touch.

4.  __________ are used to determine if a solution is acid or base.
   Ans: Indicators are used to determine if a solution is an acid or base. 

5. Ant bite contains ______________.
   Ans: Ant bite contains Formic acid.

6. Vinegar contains _________________.
   Ans: Vinegar contains Acetic acid.

7. Lactic acid is present in _____.
   Ans: Lactic acid is present in Curd.

8. Solution which does not change colour in presence of any indicator is considered to be _____________.
   Ans: Solution which does not change colour in presence of any indicator is considered to be  Neutral.

9. Oxalic acid is present in __________.
   Ans: Oxalic acid is present in Spinach.

10.  Phenolphthalein turns pink in ______________.

Ans: Phenolphthalein turns pink in Bases.

Refer To Page 1 - 2 For 3 Mark Questions In The PDF

Short Answer Questions (3 marks)

1. What is litmus? Explain its action.

Ans: Litmus is a type of indicator derived from lichens. It has a purple colour in distilled water. As a result, it is purple in neutral conditions. It becomes crimson when mixed with acids. It turns blue when mixed with bases. It comes in the form of red and blue litmus paper strips as well as solutions.

2. Explain the action of turmeric as an indicator.

Ans: Turmeric is an indication that is found in nature. It has a yellow colour in neutral conditions. It turns a darker yellow when exposed to acid. It turns crimson in colour when exposed to basic circumstances. Because soap is basic in nature, turmeric stains on textiles turn scarlet when they come into contact with it.

3. Explain the use of China rose as an indicator.

Ans: The rise of China is a good example of a natural indication. It has an orange colour in neutral conditions. It changes colour from dark pink to magenta when exposed to acid. It becomes green in basic conditions.

4. Explain the use of phenolphthalein as an indicator.

Ans: Phenolphthalein is a man-made marker. It is colourless in neutral circumstances. When exposed to basic circumstances, it turns pink, and when exposed to acidic ones, it turns colourless.

5. What is neutralization?

Ans: The reaction of acid and base to produce salt and water is known as neutralisation. An acid reacts with a base to counteract its effects and vice versa. Salt and water are formed as a result of the neutralisation process.

Acid + Base → Salt + water.

Refer to Page 2 - 3 for 5 Mark Questions in The PDF

Long Answer Questions (5 marks)

1. Explain the uses of neutralization in daily life.

Ans: Acids and bases play a significant role in our daily lives. As a result, in order to counteract the effect of one, the other is used. The following are some examples of frequent neutralising reactions that we observe in everyday life:

1. Antacid use: Indigestion produces stomach acidity. In this situation, the stomach secretes more acid than is needed. Weak bases or basic salts can be used to neutralise it. The base will neutralise the acid and make you feel better.

2. Ant bite treatment: Ant bites contain formic acid, which causes skin irritation, swelling, and rashes. Basic chemicals such as calamine or baking soda can be used to neutralise the acid in the sting and provide comfort.

3. Soil Treatment: Plants growing in a pH-balanced environment. Depending on the plant, this state varies. Plants, on the other hand, cannot flourish in very alkaline or acidic environments. If the soil is excessively alkaline, it can be remedied by adding acidic organic matter such as manure and compost. If the soil is overly acidic, slaked lime can be used to balance it out.

4. Treatment of industrial wastes: Industrial wastes have a high concentration of acidic compounds that, if released into water bodies, will harm aquatic life. As a result, they must be neutralised with basic substances before being released.

5. Toothpaste: When bacteria in our mouth break down food lodged between our teeth, acidic compounds are formed. Tooth decay is caused by these acids. Toothpaste is so basic in nature in order to neutralise acids in the mouth.

2. What is acid rain?

Ans: Acid rain is defined as rain or precipitation that contains an excess of acids. The rise in contaminants in the air causes this. Polluting gases such as carbon dioxide, carbon monoxide, nitrogen oxides, and sulphur combine with rainwater and react.

Acids dominate in this downpour. Acid rain is also dangerous because acids are corrosive. Buildings are corroded and damaged by acid rain. It causes skin problems by causing damage to the skin. It also causes acidification in water bodies and soil, which has a negative impact on aquatic and plant life.

3. There are few solutions given. Compare the reactions to the use of litmus, turmeric and phenolphthalein as an indicator. Lemon juice, Lime water, Milk of magnesia, Milk, Toothpaste

Ans:

Class 7 Science Chapter 4 Important Questions PDF

Free PDF on the fresh set of important questions for Class 6 Science Chapter 4 is available on our platform. Class 7 Science Chapter 4 Important Questions in a PDF format can be easily accessed from our website. The solution to all the questions is available in a simple language for the students appearing in the session 2024-25 exams. Here, you will get the best latest 7 science Ch 4 important questions. Also, you will get the solutions to all these questions, we assure you get the study materials that are according to the latest CBSE guidelines.

Class 7 Science Chapter 4 Important Topics

Acids, bases, and salts affect the chemistry and our day to day life as well. They can be identified by their taste; that is acids taste sour and bases taste bitter and salt itself has a salty taste.

Topics and Subtopics Covered in Class 7 Science Chapter 4 Are

1. Acids, Bases, and Salts

2. Acids and Bases

3. Natural indicators around us/surroundings

4. Neutralization

5. Neutralization in everyday life

Extra Questions Of Acids Bases And Salts Class 7

1. A natural dye, Litmus is an extract of which of the following?

(a) China rose (Gudhal)

(b) Blueberries (Jamun)

(c) Beetroot

(d) Lichen

2. The correct way of making a solution of acid in water is to

(a) add water to acid.

(b) add acid to water.

(c) mix acid and water simultaneously.

(d) add water to acid in a shallow container.

3. A neutralization reaction is which of the following?

(a) physical and reversible change.

(b) a physical change that is irreversible.

(c) chemical and reversible change.

(d) the chemical change that is irreversible

4. A reaction that occurs between an acid and a base is:

(a) Substitution reaction

(b) Neutralization reaction

(c) Addition reaction

(d) Displacement reaction

You can download extra questions on acids, bases, and salts Class 7 in a PDF format.

Important Questions For Class 7 Science Chapter 4

The above-mentioned topics are important to understand. The important topics are scourged by our subject matter experts and preparing these will help you crack the exam with a good score. Download the notes on important questions for Class 7 Science Chapter 4  for free from our website. 

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Preparing for the exam using the Important Questions for Class 7 Science Chapter 4 - Acids, Bases, and Salts can be a strategic and effective approach to boost your confidence and performance. Here are some steps to utilize these questions for better exam preparation:

Understand the Chapter: Begin by thoroughly studying the entire Chapter 4, familiarising yourself with the concepts of acids, bases, and salts. Ensure you have a solid grasp of the properties, chemical reactions, and examples of these substances.

Identify Important Topics: Review the Important Questions and identify the key topics that are frequently asked in exams. Focus on understanding these topics in depth as they carry more weightage.

Answer Questions Individually: Attempt the important questions one by one without referring to the solutions initially. This will help you assess your knowledge and identify areas for further improvement.

Refer to Solutions: After attempting the questions, cross-check your answers with the provided solutions. Pay attention to the explanations and understand the correct methods of answering.

Revise Regularly: Regular revision is crucial for retention. Revisit the important questions and solutions frequently to reinforce your understanding.

Solve Sample Papers: To further enhance your exam preparedness, solve sample papers and previous years' question papers. This will familiarise you with the exam pattern and time management.

Clear Doubts: If you encounter any doubts or find certain concepts challenging, seek help from your teachers, classmates, or online resources.

Create Flashcards: Create flashcards for important formulas, chemical reactions, and definitions to revise quickly and efficiently.

Time Management: Practice answering the questions within the time limits to improve your time management skills during the actual exam.

Stay Positive and Confident: Believe in your abilities and stay positive throughout the preparation process. Confidence plays a crucial role in performing well in exams.

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Conclusion

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