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प्रश्न
State whether the following statements are true or false. Correct the false statements.
Phenolphthalein is a natural indicator.
पर्याय
True
False
उत्तर
False
Explanation:
Phenolphthalein is a synthetic indicator.
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संबंधित प्रश्न
Five solutions, A, B, C, D and E, when tested with universal indicator, showed pH as 4, 1, 11, 7 and 9, respectively. Which solution is
- neutral?
- strongly alkaline?
- strongly acidic?
- weakly acidic?
- weakly alkaline?
Arrange the pH in increasing order of hydrogen-ion concentration.
Fill in the blank in the following sentences:
Those substances whose smell (or odour) changes in acidic or basic solution are called .......................... indicators.
If someone is suffering from the problem of acidity after overeating, which of the following would you suggest as remedy?
Lemon juice, Vinegar, Banking soda solution
Give reason for your choice.
What is the name of the indicator which can be used for testing the pH of a solution?
What colour will universal indicator show if you add it to the following substances?
(a) potassium hydroxide, pH = 12
(b) soda water, pH = 5
(c) sulphuric acid, pH = 2
Fill in the following blank with suitable words:
Alkalis have a pH.............. than 7.
How does an antacid work?
When a solution becomes more acidic, does the pH get higher or lower?
Explain why the pH in a person's mouth becomes lower after each meal.
How could the person change his eating habits to lessen chances of suffering from tooth decay?
