All the important questions from Class 7 Science Chapter 5 – Acids, Bases and Salts


 Here are all the important questions from Class 7 Science Chapter 5 – Acids, Bases and Salts, categorized by type for better understanding and revision:

🔹 Very Short Answer Questions (1 mark)

  1. What is the taste of acids?

  2. What is the taste of bases?

  3. Name a natural indicator.

  4. What is turmeric used for in science experiments?

  5. What is the colour of litmus in acid?

  6. What is the colour of litmus in base?

  7. What type of solution turns blue litmus red?

  8. What type of solution turns red litmus blue?

🔹 Short Answer Questions (2–3 marks)

  1. What are acids? Give two examples.

  2. What are bases? Give two examples.

  3. What are indicators? Name any two natural indicators.

  4. What is neutralisation?

  5. What is the use of neutralisation in daily life?

  6. Write two differences between acids and bases.

  7. What happens when an acid reacts with a base?

  8. Name the products formed when an acid reacts with a base.

  9. What is the colour change of China rose indicator in acid and base?

🔹 Long Answer Questions (4–5 marks)

  1. Explain the process of neutralisation with an example.

  2. Describe an activity to show the neutralisation reaction using turmeric.

  3. List and explain the uses of neutralisation in daily life (any 3–4 examples).

  4. Explain how indigestion, ant bite and soil treatment are related to neutralisation.

  5. Write an experiment to show how litmus paper works with acid and base.

🔹 Higher Order Thinking Skills (HOTS)

  1. Why should we not taste unknown substances to check if they are acidic or basic?

  2. If a solution turns red litmus blue and has a bitter taste, what type of solution is it? Justify your answer.

  3. A person accidentally eats a food item with too much acid. What should be done? Why?

🔹 Multiple Choice Questions (MCQs)

  1. Which of the following is a natural indicator?

    • a) Vinegar

    • b) Soap

    • c) Litmus

    • d) Salt
      Answer: c) Litmus

  2. An acid tastes:

    • a) Sweet

    • b) Sour

    • c) Bitter

    • d) Salty
      Answer: b) Sour

  3. What is formed during neutralisation?

    • a) Only salt

    • b) Salt and acid

    • c) Salt and base

    • d) Salt and water
      Answer: d) Salt and water

Would you like detailed answers for all of these questions as well?

Here are the detailed answers for all the important questions from Class 7 Science Chapter 5 – Acids, Bases and Salts:

🔹 Very Short Answer Questions

  1. What is the taste of acids?
    Acids taste sour.

  2. What is the taste of bases?
    Bases taste bitter and feel soapy to touch.

  3. Name a natural indicator.
    Litmus is a natural indicator.

  4. What is turmeric used for in science experiments?
    Turmeric is used as a natural indicator to test for acids and bases.

  5. What is the colour of litmus in acid?
    Litmus turns red in an acidic solution.

  6. What is the colour of litmus in base?
    Litmus turns blue in a basic solution.

  7. What type of solution turns blue litmus red?
    An acidic solution turns blue litmus red.

  8. What type of solution turns red litmus blue?
    A basic solution turns red litmus blue.

🔹 Short Answer Questions

  1. What are acids? Give two examples.
    Acids are substances that have a sour taste and turn blue litmus red.
    Examples: Lemon juice (contains citric acid), vinegar (contains acetic acid).

  2. What are bases? Give two examples.
    Bases are substances that are bitter in taste and turn red litmus blue.
    Examples: Soap solution, baking soda (sodium bicarbonate).

  3. What are indicators? Name any two natural indicators.
    Indicators are substances that change colour in acidic or basic solutions.
    Examples: Litmus, turmeric.

  4. What is neutralisation?
    Neutralisation is the chemical reaction in which an acid reacts with a base to form salt and water.

  5. What is the use of neutralisation in daily life?
    Neutralisation helps in treating problems like indigestion, soil acidity, and ant bites.

  6. Write two differences between acids and bases.

    Acids Bases
    Sour in taste Bitter in taste
    Turn blue litmus red Turn red litmus blue

  7. What happens when an acid reacts with a base?
    A neutralisation reaction occurs, producing salt and water.

  8. Name the products formed when an acid reacts with a base.
    The products are salt and water.

  9. What is the colour change of China rose indicator in acid and base?
    In acid – turns dark pink or red
    In base – turns green

🔹 Long Answer Questions

  1. Explain the process of neutralisation with an example.
    When an acid reacts with a base, a neutralisation reaction occurs. For example:
    Hydrochloric acid (HCl) + Sodium hydroxide (NaOH) → Sodium chloride (salt) + Water
    This is called a neutralisation reaction because the acid and base cancel each other’s effect.

  2. Describe an activity to show the neutralisation reaction using turmeric.
    Take a strip of turmeric paper. Apply soap (base) to it – it turns red.
    Now put lemon juice (acid) on the red part – it turns yellow again.
    This shows that the base was neutralised by the acid.

  3. List and explain the uses of neutralisation in daily life (any 3–4 examples).

    • Indigestion: Excess acid in the stomach is neutralised by antacids (bases).

    • Ant bites: Formic acid from ant bites is neutralised by applying baking soda.

    • Soil treatment: Acidic soil is neutralised using quick lime (base).

    • Factory waste: Acidic waste from factories is neutralised before disposal.

  4. Explain how indigestion, ant bite and soil treatment are related to neutralisation.

    • Indigestion: Acid in stomach is neutralised by antacid.

    • Ant bite: Acid from bite is neutralised by base.

    • Soil treatment: Acidic soil is neutralised using lime or chalk.

  5. Write an experiment to show how litmus paper works with acid and base.
    Take red and blue litmus papers.

    • Dip blue litmus in lemon juice → turns red (acid).

    • Dip red litmus in soap solution → turns blue (base).

🔹 Higher Order Thinking Skills (HOTS)

  1. Why should we not taste unknown substances to check if they are acidic or basic?
    Because the substances could be harmful, poisonous, or corrosive, and tasting them can cause injury or illness.

  2. If a solution turns red litmus blue and has a bitter taste, what type of solution is it? Justify your answer.
    It is a base because it turns red litmus blue and tastes bitter.

  3. A person accidentally eats a food item with too much acid. What should be done? Why?
    The person should take an antacid (like milk of magnesia) because it is a base and will neutralise the excess acid in the stomach.

🔹 Multiple Choice Questions (MCQs)

  1. Which of the following is a natural indicator?
    Answer: c) Litmus

  2. An acid tastes:
    Answer: b) Sour

  3. What is formed during neutralisation?
    Answer: d) Salt and water

Let me know if you'd like these in PDF format or as flashcards for easier revision!

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