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प्रश्न
Distinguish between acid and alkali (other than indicators).
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उत्तर १
An acid is that substance which gives H+ ions when dissolved in water.
An alkali is that substance which gives OH− ions when dissolved in water.
उत्तर २
Acids: Have a sour taste.
Alkalis: They have a Sharp bitter taste, and they are soapy to the touch.
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संबंधित प्रश्न
What do you understand by an alkali?
Give one example in the following case:
A basic oxide which is insoluble in water.
Metal corrodes due to salts.
Salts are neutral.
Write the balanced equation for the reaction of:
A named acid and a named alkali.
When the soil is too basic, plants do not grow well in it. To improve its quality what must be added to the soil?
On adding phenolphthalein indicator to a colourless solution, no change is observed. What is the nature of this solution?
Look at figure which shows solutions taken in test tubes A, B, C and D. What colour is expected when a piece of red litmus paper is dropped in each test tube? Nature of the solutions is given in the table for your help.
| Test tube | Nature of Solution | Change in colour of red litmus |
| A | Neutral | |
| B | Basic | |
| C | Acidic | |
| D | Neutral |
Match the following:
| 1. | Wasp sting | a. | Milk of magnesia |
| 2. | Common salt | b. | Acetic acid |
| 3. | Organic acid | c. | Sodium chloride |
| 4. | Antacid | d. | Vinegar |
NaOH & KOH are strong bases.
