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CBSE Class 7 Science Chapter 4 Acids, Bases and Salts MCQ Questions
By Maitree Choube
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Updated on 1 Sep 2025, 12:20 IST
Explore the world of chemistry with our multiple choice questions on Acids, Bases and Salts for class 7 This chapter covers the properties, uses, and reactions of acids, bases, and salts. Acids Bases and Salts MCQ help reinforce your understanding and prepare you for exams. These MCQ questions cover key topics and ensure you grasp the fundamentals.
Practice with these Class 7 Acids Bases and Salts MCQ questions to build confidence and improve retention. Whether you need MCQ on acids, bases and salts class 7 pdf or multiple choice questions on acids bases and salts pdf, this resource is perfect for mastering the chapter. Get in and excel in your science exams with our comprehensive MCQs.
Science Chapter 4 Acids Bases and Salts Class 7 MCQ
Here are 50 Multiple Choice Questions on Acids, Bases and Salts for class 7 with answers. These Acids Bases and Salts class 7 MCQ encompass various topics from the chapter, including the properties of acids and bases, their natural sources, and their reactions and applications.
Each question is crafted to assess your grasp of these essential concepts, offering a thorough understanding of the chemistry involved. This MCQ questions is ideal for students looking to enhance their knowledge and effectively prepare for their exams.
Acids Bases and Salts Class 7 MCQ Questions with Answers Exercise
- What is the taste of curd as described in the chapter?
a) Sweet
b) Sour
c) Bitter
d) Salty
Answer: b) Sour
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- From where is litmus extracted?
a) Turmeric
b) Beetroot
c) Lichens
d) China rose
Answer: c) Lichens
- When blue litmus paper is dipped in acid, to what color does it change?
a) Blue
b) Yellow
c) Red
d) Green
Answer: c) Red
- Which of the following is a natural indicator?
a) Phenolphthalein
b) Litmus
c) Methyl orange
d) Bromothymol blue
Answer: b) Litmus
- What is the nature of baking soda?
a) Acidic
b) Basic
c) Neutral
d) None of the above
Answer: b) Basic
- Which acid is found in vinegar according to the chapter?
a) Citric acid
b) Lactic acid
c) Acetic acid
d) Tartaric acid
Answer: c) Acetic acid
- What effect does turmeric have when mixed with a basic solution?
a) It turns pink
b) It turns red
c) It turns yellow
d) It turns blue
Answer: b) It turns red
Also Check: CBSE Class 7 Science Syllabus
- Which base is found in window cleaner?
a) Sodium hydroxide
b) Ammonium hydroxide
c) Magnesium hydroxide
d) Calcium hydroxide
Answer: b) Ammonium hydroxide
- What is the effect of adding acidic solution to China rose indicator?
a) Turns yellow
b) Turns magenta
c) Turns blue
d) Turns green
Answer: b) Turns magenta
- What is the primary use of sodium hydroxide?
a) Used in baking
b) Used in cleaning
c) Used in medicine
d) Used in agriculture
Answer: b) Used in cleaning
- Which acid is involved in an ant bite?
a) Lactic acid
b) Hydrochloric acid
c) Formic acid
d) Citric acid
Answer: c) Formic acid
- What does the neutralisation process produce?
a) Acid only
b) Base only
c) Salt and water
d) Water only
Answer: c) Salt and water
- What turns red litmus paper blue?
a) Acid
b) Salt
c) Water
d) Base
Answer: d) Base
- Which of the following is not a natural acid as mentioned in the chapter?
a) Citric acid
b) Ascorbic acid
c) Hydrochloric acid
d) Tartaric acid
Answer: c) Hydrochloric acid
- Which substance is used to treat indigestion according to the chapter?
a) Baking soda
b) Lime water
c) Milk of magnesia
d) Common salt
Answer: c) Milk of magnesia
- What is the primary component of antacid?
a) Magnesium hydroxide
b) Sodium hydroxide
c) Calcium hydroxide
d) Ammonium hydroxide
Answer: a) Magnesium hydroxide
- What color does turmeric turn when it contacts a basic substance?
a) Red
b) Blue
c) Yellow
d) Green
Answer: a) Red
- Which substance is used to neutralize acidic soil?
a) Baking soda
b) Quick lime
c) Vinegar
d) Ammonium hydroxide
Answer: b) Quick lime
- Which of the following is a basic substance used to treat acidic soil?
a) Sodium chloride
b) Calcium hydroxide
c) Sodium hydroxide
d) Magnesium hydroxide
Answer: b) Calcium hydroxide
- What color does phenolphthalein turn in a basic solution?
a) Red
b) Blue
c) Pink
d) Colorless
Answer: c) Pink
- What is the nature of lime water?
a) Acidic
b) Basic
c) Neutral
d) None of the above
Answer: b) Basic
- What is formed when an acid reacts with a base?
a) Salt and water
b) Acid only
c) Base only
d) Acid and base
Answer: a) Salt and water
- What is the chemical nature of substances that taste bitter and feel soapy?
a) Acidic
b) Basic
c) Neutral
d) Salty
Answer: b) Basic
- Which natural indicator is obtained from lichens?
a) Turmeric
b) Litmus
c) China rose
d) Beetroot
Answer: b) Litmus
- What is the effect of China rose indicator on a basic solution?
a) Turns yellow
b) Turns green
c) Turns pink
d) Turns red
Answer: b) Turns green
- What is the chemical formula for hydrochloric acid?
a) H2SO4
b) HNO3
c) HCl
d) CH3COOH
Answer: c) HCl
- Which of the following is a neutral solution?
a) Lemon juice
b) Milk of magnesia
c) Distilled water
d) Vinegar
Answer: c) Distilled water
- Which substance is used as an antacid?
a) Calcium hydroxide
b) Magnesium hydroxide
c) Sodium hydroxide
d) Potassium hydroxide
Answer: b) Magnesium hydroxide
- What happens when an acid reacts with a metal?
a) Salt and hydrogen gas are formed
b) Water and hydrogen gas are formed
c) Base and hydrogen gas are formed
d) Salt and water are formed
Answer: a) Salt and hydrogen gas are formed
- What is the main component of vinegar?
a) Citric acid
b) Lactic acid
c) Acetic acid
d) Tartaric acid
Answer: c) Acetic acid
- What does a base produce when dissolved in water?
a) Hydrogen ions
b) Hydroxide ions
c) Chloride ions
d) Sulfate ions
Answer: b) Hydroxide ions
- Which acid is present in lemons?
a) Acetic acid
b) Formic acid
c) Citric acid
d) Tartaric acid
Answer: c) Citric acid
- Which base is used in the preparation of soap?
a) Sodium hydroxide
b) Calcium hydroxide
c) Ammonium hydroxide
d) Magnesium hydroxide
Answer: a) Sodium hydroxide
- What is the effect of adding a base to turmeric paper?
a) No change
b) Turns red
c) Turns blue
d) Turns yellow
Answer: b) Turns red
- What type of acid is found in the stomach?
a) Sulfuric acid
b) Nitric acid
c) Hydrochloric acid
d) Acetic acid
Answer: c) Hydrochloric acid
- What does an acid produce when dissolved in water?
a) Hydroxide ions
b) Hydrogen ions
c) Chloride ions
d) Sulfate ions
Answer: b) Hydrogen ions
- Which of the following is a common property of all acids?
a) Bitter taste
b) Soapy feel
c) Sour taste
d) No taste
Answer: c) Sour taste
- What is the chemical nature of soap?
a) Acidic
b) Basic
c) Neutral
d) Salty
Answer: b) Basic
- Which acid is found in tamarind?
a) Acetic acid
b) Citric acid
c) Tartaric acid
d) Lactic acid
Answer: c) Tartaric acid
- Which substance is used to neutralize the acidic effect of an ant bite?
a) Lemon juice
b) Vinegar
c) Baking soda
d) Sugar solution
Answer: c) Baking soda
- What is the effect of an acid on blue litmus paper?
a) Turns red
b) Turns blue
c) Turns yellow
d) No change
Answer: a) Turns red
- Which of the following solutions is neutral?
a) Vinegar
b) Lemon juice
c) Milk of magnesia
d) Sugar solution
Answer: d) Sugar solution
- Which base is found in milk of magnesia?
a) Sodium hydroxide
b) Ammonium hydroxide
c) Magnesium hydroxide
d) Calcium hydroxide
Answer: c) Magnesium hydroxide
- What is the chemical nature of lime water?
a) Acidic
b) Basic
c) Neutral
d) None of the above
Answer: b) Basic
- What is the color of phenolphthalein in acidic solution?
a) Red
b) Blue
c) Pink
d) Colorless
Answer: d) Colorless
- Which substance is used to neutralize factory waste before disposing it into water bodies?
a) Acid
b) Base
c) Salt
d) Water
Answer: b) Base
- Which acid is found in oranges?
a) Acetic acid
b) Formic acid
c) Citric acid
d) Tartaric acid
Answer: c) Citric acid
- Which indicator turns red in an acidic solution and blue in a basic solution?
a) Litmus
b) Phenolphthalein
c) Methyl orange
d) Turmeric
Answer: a) Litmus
- Which of the following is used to treat basic soil?
a) Quick lime
b) Organic matter (compost)
c) Baking soda
d) Ammonium hydroxide
Answer: b) Organic matter (compost)
- Which acid is found in spinach?
a) Acetic acid
b) Formic acid
c) Oxalic acid
d) Tartaric acid
Answer: c) Oxalic acid
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FAQs on Science Chapter 4 Acids Bases and Salts
What is an acid?
An acid is a substance that tastes sour and turns blue litmus paper red.
What are salts in chemistry?
Salts are compounds formed when acids react with bases, resulting in neutralization.
What happens in a neutralization reaction?
In neutralization, an acid reacts with a base to form salt and water.
What is the litmus test used for?
The litmus test identifies whether a substance is acidic or basic using litmus paper.
Give an example of an acid commonly found at home
Lemon juice contains citric acid, a common household acid.
How do acids and bases affect plant growth?
The pH of soil affects plant growth, with most plants preferring slightly acidic or neutral soil.
Are all salts edible?
No, not all salts are safe to eat. Table salt (sodium chloride) is edible, but other salts may not be.