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प्रश्न
What do you understand by an alkali?
उत्तर
An alkali is a basic hydroxide which when dissolved in water produces hydroxyl ions (OH−) as the only negatively charged ions.
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संबंधित प्रश्न
Give one example in the following case:
A hydroxide which is insoluble in water.
Give one example in the following case:
A base which is not an alkali.
Give one example in the following case:
A base which does not contain a metal ion.
What is the term defined by the following?
A base which is soluble in water.
All bases are alkalis.
Look at Figure 5.1 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? The 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. | Sulphuric acid | a. | Weak base |
| 2. | Sodium hydroxide | b. | Strong acid |
| 3. | Acetic acid | c. | Strong base |
| 4. | Ammonium hydroxide | d. | Weak acid |
All bases are alkalis but all alkalis are not bases.
Name the base which is present in a window cleaner.
Which of the following solutions do not conduct electricity?
