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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 hydroxide which is insoluble in water.
Give one example in the following case:
An oxide which is a base.
How would you obtain an alkali from a base.
Main constituent of base is ______.
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 |
Boojho, Paheli and their friend Golu were provided with a test tube each containing China rose solution which was pink in colour. Boojho added two drops of solution ‘A’ in his test tube and got dark pink colour. Paheli added 2 drops of solution ‘B’ to her test tube and got green colour. Golu added 2 drops of solution ‘C’ but could not get any change in colour. Suggest the possible cause for the variation in their results.
Bases are chemical substances that are corrosive and ______ in taste.
All bases are alkalis but all alkalis are not bases.
What is the role of toothpaste in the prevention of tooth decay?
Which of the following pairs are weak bases?
