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प्रश्न
Write any four physical properties of base.
उत्तर
- Bases generally exist in solid state but some bases exist in liquid state also. E.g. Ammonium hydroxide, calcium hydroxide.
- Bases give soapy touch only in aqueous media not in dry nature.
- Bases are bitter in taste.
- Bases are corrosive in nature. When come in contact with the skin frequently they form painful blisters.
- Bases also change the colour of the indicators. Red litmus paper turns blue when . treated with bases. Similarly, they turn methyl orange yellow and phenolphthalein pink.
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संबंधित प्रश्न
What are the uses of bases?
Alkalis are ____________.
Assertion: Ammonium hydroxide is a weak base.
Reason: Phenolphthalein becomes pink in NH2OH.
Sodium hydrogencarbonate when added to acetic acid evolves a gas. Which of the following statements are true about the gas evolved?
- It turns lime water milky
- It extinguishes a burning splinter
- It dissolves in a solution of sodium hydroxide
- It has a pungent odour
When zinc metal is treated with a dilute solution of a strong acid, a gas is evolved which is utilised in the hydrogenation of oils. Name the gas evolved. Write the chemical equation of the reaction involved and also write a test to detect the gas formed.
The common salt is ______.
Match the following:
| 1. | Sodium chloride | a. | Detergents |
| 2. | Sodium carbonate | b. | Purification of water |
| 3. | Sodium bicarbonate | c. | Taste to food |
| 4. | Potash alum | d. | Antacids |
Assertion: A salt is produced when an acid is neutralized by a base.
Reason: A salt can be acidic, basic, or neutral.
Write the chemical equation for the reaction of bases with metal oxides.
What is Potash alum? Write its formula.
