Advertisements
Advertisements
Question
Phenolphthalein is a synthetic indicator and its colours in acidic and basic solutions, respectively are ______.
Options
red and blue.
blue and red.
pink and colourless.
colourless and pink.
Advertisements
Solution
Phenolphthalein is a synthetic indicator and its colours in acidic and basic solutions, respectively are colourless and pink.
Explanation:
Phenolphthalein remains colourless in acidic solution and turns pink in basic solution.
APPEARS IN
RELATED QUESTIONS
What happens during a bee sting? What is its remedy?
The salt which will give a neutral solution on dissolving in water will be ______.
Write balanced equation to satisfy the following statement:
\[\ce{Acid + Sulphite or bisulphite -> Salt + water + sulphur dioxide}\]
Identify the following solutions, whether they are acid or base.
| Solution | Change in Indicator | Acid/Base | ||
| Litmus | Phenolphthalein | Methyl orange | ||
| 1. | -- | No change | -- | |
| 2. | -- | -- | Orange colour turns red | |
| 3. | Red litmus turns blue | -- | -- | |
Sulphuric acid has the highest importance in the chemical industry. Why?
Give the name and formula of two : Volatile acids
A farmer was unhappy because of his low crop yield. He discussed the problem with an agricultural scientist and realised that the soil of his field was either too acidic or too basic. What remedy would you suggest the farmer to neutralise the soil?
You are provided with four test tubes containing sugar solution, baking soda solution, tamarind solution, salt solution. Write down an activity to find the nature (acidic/basic/neutral) of each solution.
Write the important uses of hydrochloric acid and sulphuric acids.
Curd contains ______ acid.
