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CBSE Class 7  >  Class 7 Test  >  Test: Acids, Base & Salts - Class 7 MCQ

Acids, Base & Salts - Free MCQ Practice Test with solutions, Class 7


MCQ Practice Test & Solutions: Test: Acids, Base & Salts (15 Questions)

You can prepare effectively for Class 7 with this dedicated MCQ Practice Test (available with solutions) on the important topic of "Test: Acids, Base & Salts". These 15 questions have been designed by the experts with the latest curriculum of Class 7 2026, to help you master the concept.

Test Highlights:

  • - Format: Multiple Choice Questions (MCQ)
  • - Duration: 40 minutes
  • - Number of Questions: 15

Sign up on EduRev for free to attempt this test and track your preparation progress.

Test: Acids, Base & Salts - Question 1
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Which of the following statements about acids is true?

Detailed Solution: Question 1

Nitric acid is indeed an acid and will turn blue litmus paper red, which is a characteristic property of acids.
While many acids have a sour taste, not all acids are strong, and some acids can react with metals.

Test: Acids, Base & Salts - Question 2
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What is the primary compound produced when an acid reacts with a base?

Detailed Solution: Question 2

When an acid reacts with a base, the products are typically salt and water.
This process is known as neutralization, which is fundamental in acid-base chemistry.

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Test: Acids, Base & Salts - Question 3
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Which natural indicator remains yellow in acidic solutions and turns red in basic solutions?

Detailed Solution: Question 3

Turmeric is a natural pH indicator. It remains yellow in acidic solutions and turns red in basic solutions. This property helps in identifying whether a solution is acidic or basic.

Test: Acids, Base & Salts - Question 4
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What is the pH range of neutral solutions?

Detailed Solution: Question 4

A neutral solution has a pH of exactly 7.
This indicates that the concentrations of hydrogen ions and hydroxide ions are equal.

Test: Acids, Base & Salts - Question 5
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What effect does rain have when it becomes acidic?

Detailed Solution: Question 5

Acid rain can have detrimental effects on aquatic ecosystems, damaging fish and plant life by altering the pH of water bodies.
This can lead to long-term ecological impacts.

Test: Acids, Base & Salts - Question 6
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What is the main acid found in the human stomach?

Detailed Solution: Question 6

Hydrochloric acid is the primary acid in the stomach, aiding in digestion and providing an acidic environment that helps kill harmful bacteria.
This is crucial for the digestive process.

Test: Acids, Base & Salts - Question 7
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Why is it important to neutralize factory waste before disposal?

Detailed Solution: Question 7

Neutralizing factory waste is crucial to making it less harmful and safe for the environment, preventing pollution and protecting ecosystems from toxic substances.

Test: Acids, Base & Salts - Question 8
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Which acid is commonly found in citrus fruits like lemons and oranges?

Detailed Solution: Question 8

Citric acid is the primary acid found in citrus fruits, contributing to their sour taste and acting as a natural preservative.
It also plays a role in metabolic processes.

Test: Acids, Base & Salts - Question 9
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What happens to blue litmus paper when it is placed in a basic solution?

Detailed Solution: Question 9

Blue litmus paper remains blue when placed in a basic solution, indicating that the solution is alkaline.
This reaction helps identify the nature of the solution effectively.

Test: Acids, Base & Salts - Question 10
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What is the effect of acid rain on buildings made of limestone?

Detailed Solution: Question 10

Acid rain can erode limestone buildings due to the reaction of acid with calcium carbonate in the stone, leading to deterioration over time.
This is a significant concern for historical structures.

Test: Acids, Base & Salts - Question 11
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What is the role of indicators in acid-base chemistry?

Detailed Solution: Question 11

Indicators are substances that change color based on the pH of the solution, helping to determine whether a solution is acidic or basic.
This is essential for various chemical analyses.

Test: Acids, Base & Salts - Question 12
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Which of the following is a weak acid commonly found in vinegar?

Detailed Solution: Question 12

Acetic acid is the main component of vinegar, providing its characteristic sour taste and acidity.
It is widely used in cooking and food preservation.

Test: Acids, Base & Salts - Question 13
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What is the general formula for a neutralization reaction between an acid and a base?

Detailed Solution: Question 13

The general formula for a neutralization reaction is Acid + Base → Salt + Water, which summarizes the products formed during this reaction.
This is a fundamental concept in chemistry.

Test: Acids, Base & Salts - Question 14
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How can you test if a solution is acidic?

Detailed Solution: Question 14

Using litmus paper is a straightforward method to test if a solution is acidic; it will turn blue litmus paper red if the solution is acidic.
This method is widely used in laboratories.

Test: Acids, Base & Salts - Question 15
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What is the chemical formula for hydrochloric acid?

Detailed Solution: Question 15

The chemical formula for hydrochloric acid is HCl, which consists of one hydrogen atom and one chlorine atom.
This strong acid is commonly used in various industrial processes.

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About this Class 7 Practice Test

This test contains 15 MCQs on Acids, Base & Salts with detailed solutions for each question. It is part of the course on EduRev, designed to align with the current Class 7 syllabus. Each solution explains not just the correct answer but also gives you an understanding of the topic — not just to attempt the question but also help you prepare for the exam with practice.

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