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Test: pH Scale & Its Importance


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

Test: pH Scale & Its Importance for Class 10 2022 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 2022 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

A sample of soil is mixed with water and allowed to settle. The clear supernatant solution turns the pH paper yellowish-orange. Which of the following would change the colour of this pH paper to greenish-blue?

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

Yellowish orange colour on pH paper is shown by acidic substances hence to change the colour of pH paper to greenish blue (pH = 8), an antacid should be added since antacids are basic in nature.

Test: pH Scale & Its Importance - Question 2

A fruit juice is tested for its pH value. What could be its possible pH if the colour is changed to yellow?

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

Less than 6.0 
pH range ( 5-6) shows up yellow colour on pH paper. 

Test: pH Scale & Its Importance - Question 3

Which of the following will be the strongest base?

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

Strong bases have very high pH values, usually in range 12 to 14.

Test: pH Scale & Its Importance - Question 4

Four student (a), (b), (c) and (d) measured the pH values of water, lemon juice and sodium bicarbonate solution. What is the correct decreasing order of pH values?​

Detailed Solution for Test: pH Scale & Its Importance - Question 4

1.Sodium bicarbonate (as it is a base and has pH value more than 7) .
2. Water (as it is neutral and has pH value as 7) .
3. Lemon juice (it is acidic and the pH value is less than 7).

Test: pH Scale & Its Importance - Question 5

Bee-sting contains:

Detailed Solution for Test: pH Scale & Its Importance - Question 5

Formic acid is also present in a natural state in stinging nettles, and is reponsible for the burning feeling on contact with them. It is also found in the stings and bites of many insects, including bees and ants, which use it as a chemical defence mechanism.

Test: pH Scale & Its Importance - Question 6

pH of distilled water is:

Detailed Solution for Test: pH Scale & Its Importance - Question 6

Pure distilled water should be neutral with a pH of 7, but because it absorbs carbon dioxide from the atmosphere, it's actually slightly acidic with a pH of 5.8.

Test: pH Scale & Its Importance - Question 7

Tooth decay occurs when pH of mouth is below:​

Detailed Solution for Test: pH Scale & Its Importance - Question 7

Due to eating more sweets and sugary things the particles of sugar will remain left in our mouth the bacteria present in our mouth causes the degradation of these sugar particles to produce large amount of acid which result in decrease of pH of mouth from 5.5 ultimately it lead to tooth decay.Tooth decay starts when pH is lower than 5.5 this is because the acid attack the enamel of our teeth and corrode it.

Test: pH Scale & Its Importance - Question 8

A student dipped a pH paper in an unknown liquid. Orange colour was obtained. The unknown solution can be:

Detailed Solution for Test: pH Scale & Its Importance - Question 8

Both acetic acid and ethanoic acid can turn the pH paper orange. Sodium carbonate is basic in nature.

Test: pH Scale & Its Importance - Question 9

A drop of solution ‘X’ is placed on a strip of pH paper. A deep red colour is produced. The solution ‘X’ is:​

Detailed Solution for Test: pH Scale & Its Importance - Question 9

HCl is a strong acid and has pH = 1 and hence turns the pH paper red.

Test: pH Scale & Its Importance - Question 10

The pH of a solution which is neither acidic nor basic is:​

Detailed Solution for Test: pH Scale & Its Importance - Question 10

A solution that is neither acidic nor basic is neutral and has a pH of 7.

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