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Test: pH Scale & Its Importance - Class 10 MCQ


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10 Questions MCQ Test Science Class 10 - Test: pH Scale & Its Importance

Test: pH Scale & Its Importance for Class 10 2024 is part of Science Class 10 preparation. The Test: pH Scale & Its Importance questions and answers have been prepared according to the Class 10 exam syllabus.The Test: pH Scale & Its Importance MCQs are made for Class 10 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: pH Scale & Its Importance below.
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Test: pH Scale & Its Importance - Question 1

What does a pH value greater than 7 signify in a solution?

Detailed Solution for Test: pH Scale & Its Importance - Question 1
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.
Test: pH Scale & Its Importance - Question 2

What is the origin of the term 'pH' in the pH scale?

Detailed Solution for Test: pH Scale & Its Importance - Question 2
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.
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Test: pH Scale & Its Importance - Question 3

How does the pH level impact the sensitivity of plants and animals?

Detailed Solution for Test: pH Scale & Its Importance - Question 3
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.
Test: pH Scale & Its Importance - Question 4
What is the ideal pH range for soil to support plant or crop growth?
Detailed Solution for Test: pH Scale & Its Importance - Question 4
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.
Test: pH Scale & Its Importance - Question 5
In the human digestive system, what pH range is required for optimal digestion to occur?
Detailed Solution for Test: pH Scale & Its Importance - Question 5
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.
Test: pH Scale & Its Importance - Question 6
At what pH level does tooth decay typically occur in the environment surrounding the teeth?
Detailed Solution for Test: pH Scale & Its Importance - Question 6
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.
Test: pH Scale & Its Importance - Question 7
How does the pH of a salt formed by a weak acid and a strong base compare to 7?
Detailed Solution for Test: pH Scale & Its Importance - Question 7
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.
Test: pH Scale & Its Importance - Question 8
What can be inferred about the pH of a salt resulting from a strong acid and a weak base?
Detailed Solution for Test: pH Scale & Its Importance - Question 8
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.
Test: pH Scale & Its Importance - Question 9
Why is it challenging to predict the pH of a salt formed by a weak acid and a weak base?
Detailed Solution for Test: pH Scale & Its Importance - Question 9
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.
Test: pH Scale & Its Importance - Question 10
What is the expected pH of a salt formed by a strong acid and a strong base?
Detailed Solution for Test: pH Scale & Its Importance - Question 10
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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