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MCQ Questions for class 7 Science Acids, Bases and Salts

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Below is the Quiz for class 7 Science chapter Acids, Bases and Salts. You can Tap on the Start Quiz to begin playing the MCQs.

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Total Questions: 10

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Q1. Which of the following is sour in taste?

  1. Curd
  2. Lemon juice
  3. Vinegar
  4. All of the above
Answer: All of the above

Q2. Substances which are sour in taste because they contain______

  1. Base
  2. Salt
  3. Acid
  4. None of the above
Answer: Acid

Q3. The chemical nature of sour substances is

  1. Acidic
  2. Basic
  3. Salt
  4. All of the above
Answer: Acidic

Q4. Substances which are bitter in taste and feel soapy on touching are known as

  1. Acids
  2. Neutral
  3. Bases
  4. None of the above
Answer: Bases

Q5. Special type of substances are used to test whether a substance is acidic or basic. These substances are known as

  1. Acids
  2. Indicators
  3. Salts
  4. Bases
Answer: Indicators

Q6. Which of the following is naturally occurring indicators?

  1. Turmeric
  2. Litmus
  3. China rose petals
  4. All of the above
Answer: All of the above

Q7. Which of the following is most commonly used as natural indicator?

  1. Soap
  2. Vinegar
  3. Water
  4. Litmus
Answer: Litmus

Q8. Litmus is extracted from _________

  1. Lichens
  2. Water
  3. Curd
  4. Sand
Answer: Lichens

Q9. What is the colour of blue litmus when it is added to an acidic solution?

  1. Orange
  2. Yellow
  3. Red
  4. Blue
Answer: Red

Q10. What is the colour of red litmus when it is added to a basic solution?

  1. Red
  2. Blue
  3. Green
  4. Purple
Answer: Blue

Q11. Lactic acid is found in _________

  1. Vineger
  2. Lime water
  3. Curd
  4. Soap
Answer: Curd

Q12. Acetic acid is found in __________

  1. Lime water
  2. Milk of magnesia
  3. Curd
  4. Vinegar
Answer: Vinegar

Q13. Citric acid is found in ___________

  1. Orange
  2. Lemon
  3. Both Orange and lemon
  4. None of the above
Answer: Both Orange and lemon

Q14. Calcium hydroxide is found in _________

  1. Metal
  2. Vinegar
  3. Lemon
  4. Lime water
Answer: Lime water

Q15. Magnesium hydroxide is found in __________

  1. Soap
  2. Curd
  3. Milk of magnesia
  4. Spinach
Answer: Milk of magnesia

Q16. Oxalic acid is found in ________

  1. Grapes
  2. Vinegar
  3. Milk of magnesia
  4. Spinach
Answer: Spinach

Q17. The solutions which do not change the colour of either red or blue litmus are known as

  1. Neutral solutions
  2. Soap solution
  3. Detergent solution
  4. Washing soda solution
Answer: Neutral solutions

Q18. In neutralisation reaction a new substance is formed. This is called

  1. Acids
  2. Bases
  3. Salt
  4. None of the above
Answer: Salt

Q19. The reaction between an acid and a base is known as

  1. Indicator
  2. Mixture
  3. Solution
  4. Neutralisation
Answer: Neutralisation

Q20. To relieve indigestion, we take an antacid such as

  1. Vinegar
  2. Milk of magnesia
  3. Amla
  4. Mangoes
Answer: Milk of magnesia

Q21. Which of the following is used to neutralise the effect when an ant bites?

  1. Grapes
  2. Vinegar
  3. Baking soda
  4. None of the above
Answer: Baking soda

Q22. Which of the following is used for treatment when the soil is too acidic?

  1. Oranges
  2. Curd
  3. Spinach
  4. Quick lime
Answer: Quick lime