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Class 10 Exam  >  Class 10 Tests  >  pH scale - Class 10 MCQ

pH scale - Class 10 MCQ


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12 Questions MCQ Test - pH scale

pH scale for Class 10 2025 is part of Class 10 preparation. The pH scale questions and answers have been prepared according to the Class 10 exam syllabus.The pH scale MCQs are made for Class 10 2025 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for pH scale below.
Solutions of pH scale questions in English are available as part of our course for Class 10 & pH scale solutions in Hindi for Class 10 course. Download more important topics, notes, lectures and mock test series for Class 10 Exam by signing up for free. Attempt pH scale | 3 questions in 20 minutes | Mock test for Class 10 preparation | Free important questions MCQ to study for Class 10 Exam | Download free PDF with solutions
pH scale - Question 1
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How can the strength of an acid or base solution be estimated?

Detailed Solution for pH scale - Question 1
The strength of an acid or base solution can be estimated using a universal indicator. This indicator is a mixture of several indicators and changes color at different concentrations of hydrogen ions (H+) in the solution. It helps in quickly determining whether a solution is acidic, basic, or neutral based on the color change it exhibits.
pH scale - Question 2
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What does a pH value of 7 indicate about a solution?

Detailed Solution for pH scale - Question 2
A pH value of 7 indicates a neutral solution. This means that the concentration of hydrogen ions (H+) and hydroxide ions (OH-) in the solution is equal, resulting in a balanced state where the solution is neither acidic nor basic.
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pH scale - Question 3
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What does a pH value greater than 7 signify in a solution?

Detailed Solution for pH scale - Question 3
A pH value greater than 7 signifies a basic solution. This indicates that the concentration of hydroxide ions (OH-) in the solution is higher than the concentration of hydrogen ions (H+), making the solution basic in nature. Basic solutions have a pH greater than 7 and can range from slightly basic to strongly basic.
pH scale - Question 4
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What is the origin of the term 'pH' in the pH scale?
Detailed Solution for pH scale - Question 4
The term 'pH' in the pH scale originates from the German word 'potenz,' which translates to 'power.' This term was chosen to represent the power of hydrogen ions in a solution, indicating the concentration of these ions and whether the solution is acidic, basic, or neutral based on the pH value.
pH scale - Question 5
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How does the pH level impact the sensitivity of plants and animals?
Detailed Solution for pH scale - Question 5
The pH level plays a crucial role in the sensitivity of plants and animals, affecting various biological processes such as enzyme and hormone activity. Even slight changes in pH can significantly impact the overall health and well-being of living organisms by influencing essential biological functions.
pH scale - Question 6
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What is the ideal pH range for soil to support plant or crop growth?
Detailed Solution for pH scale - Question 6
The ideal pH range for soil to support plant or crop growth is between 6.5 and 7.0. This pH range is crucial for ensuring optimal nutrient availability and uptake for plants, ultimately promoting healthy growth and productivity in agricultural settings.
pH scale - Question 7
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In the human digestive system, what pH range is required for optimal digestion to occur?
Detailed Solution for pH scale - Question 7
During the digestion process in the human stomach, a specific pH range of 1.5 to 4 is required for optimal digestion to occur. This acidic environment is essential for activating enzymes that aid in the breakdown of food, facilitating proper digestion and nutrient absorption in the digestive system.
pH scale - Question 8
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At what pH level does tooth decay typically occur in the environment surrounding the teeth?
Detailed Solution for pH scale - Question 8
Tooth decay typically occurs when the pH of the environment surrounding the teeth drops to 5.5 or lower. In this acidic environment, the demineralization of tooth enamel can occur, leading to the formation of cavities and other dental issues. Maintaining proper oral hygiene and dietary habits is crucial for preventing tooth decay.
pH scale - Question 9
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How does the pH of a salt formed by a weak acid and a strong base compare to 7?
Detailed Solution for pH scale - Question 9
When a weak acid and a strong base combine to form a salt, the resulting compound will be basic with a pH greater than 7. The presence of a strong base in the compound contributes to its alkalinity, causing the pH to rise above the neutral value of 7.
pH scale - Question 10
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What can be inferred about the pH of a salt resulting from a strong acid and a weak base?
Detailed Solution for pH scale - Question 10
In the case of a strong acid and a weak base combining to form a salt, the resulting compound will be acidic with a pH less than 7. The dominance of the strong acid component in the salt contributes to its acidic nature, leading to a pH below the neutral value of 7.
pH scale - Question 11
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Why is it challenging to predict the pH of a salt formed by a weak acid and a weak base?
Detailed Solution for pH scale - Question 11
The pH of a salt formed by a weak acid and a weak base cannot be predicted because it depends on the specific weak acid and weak base involved in the reaction. The varying strengths and concentrations of these components influence the pH outcome, making it challenging to determine the exact pH without conducting a pH test.
pH scale - Question 12
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What is the expected pH of a salt formed by a strong acid and a strong base?
Detailed Solution for pH scale - Question 12
When a strong acid and a strong base combine to form a salt, the resulting compound will have a neutral pH of approximately 7. This neutrality is due to the equal strength of the acid and base components, resulting in a balanced pH level.
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Important Questions for pH scale

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pH scale MCQs with Answers

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