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प्रश्न
Phenolphthalein is a synthetic type of indicator.
पर्याय
True
False
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उत्तर
Phenolphthalein is a synthetic type of indicator - True
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संबंधित प्रश्न
Why should curd and sour substances not be kept in brass and copper vessels?
When acids react with metal, which gas is liberated?
How is the concentration of hydronium ions (H3O+) affected when the solution of an acid is diluted?
Complete and balance the following chemical equation:
\[\ce{Zn_{(s)} + HCl_{(aq)} ->}\]
Substances do not show their acidic properties without ______.
Name the gas evolved when zinc granules are treated/heated with:
Hydrochloric acid solution
What ions are present in the solution of the following substance? (write the symbols only)
Magnesium hydroxide
Wasp stings can be treated with ______.
Hydrochloric acid reacts with a metal X to form a gas Y which burns with a ‘pop’ sound. Sodium hydroxide solution also reacts with the same metal X (on heating) to form the same gas Y.
- Name X and Y.
- Write the chemical equation of the reaction of metal X with
- hydrochloric acid, and
- sodium hydroxide solution.
Is PbO2 a base or not? Comment.
What is a neutralization reaction? Give an example.
The table given below shows the reaction of a few elements with acids and bases to evolve Hydrogen gas.
| Element | Acid | Base |
| A |
✗
|
✗ |
| B |
✓
|
✓ |
| C | ✓ | ✗ |
| D | ✓ | ✓ |
Which of these elements form amphoteric oxides?
Which of the following salts does not contain any water of crystallisation?
Which of the following gives the correct increasing order of acidic strength?
If a few drops of a concentrated acid accidentally spills over the hand of a student, what should be done?
Which of the following substance will not give carbon dioxide on treatment with dilute acid?
Which acid is present in milk?
The formula of bleaching powder is ______.
Two salts 'X' and 'Y' are dissolved in water separately. When phenolphthalein is added to these two solutions, the solution 'X' turns pink and the solution 'Y' does not show any change in colour, therefore 'X' and 'Y' are:
