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प्रश्न
What do you understand by an alkali?
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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
Oxides of metals are acidic in nature.
State the term defined by the following sentence:
A soluble base.
Bases are ______ in taste.
Wasp sting contains _______.
Match the important chemicals given in Column (A) with the chemical formulae given in Column (B)
| Column (A) | Column (B) |
| (a) Plaster of Paris | Ca(OH)2 |
| (b) Gypsum | CaSO4. 1/2 H2O |
| (c) Bleaching Powder | CaSO4.2H7O |
| (d) Slaked Lime | CaOCl2 |
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 |
Phenolphthalein gives ______ colour with lime water.
Water-soluble bases are called ______.
______ are bitter in taste.
The nature of toothpaste commonly used is ______ in nature.
