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