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प्रश्न
Phenolphthalein gives ______ colour with lime water.
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उत्तर
Phenolphthalein gives pink colour with lime water.
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संबंधित प्रश्न
Give one example in the following case:
A base which is not an alkali.
How would you obtain an alkali from a base.
Why indicator does not get affected by salt?
All bases are alkalis.
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 |
Water-soluble bases are called ______.
Sodium carbonate is commercially called ______.
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 |
Bases ionise in water to form ______ ions.
A small amount of copper oxide was taken in a beaker and dilute hydrochloric acid was added with continuous stirring of the solution. Name the compound formed and state the colour of its solution. Write the balanced chemical equation for the reaction that occurs. Based on the reaction, state the nature (acidic/basic) of copper oxide.
