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प्रश्न
Explain, all alkalis are bases but all bases are not alkalis.
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उत्तर
An alkali is a base which is soluble in water but all bases are not water soluble.
For example Ferric hydroxide [Fe(OH)3] and cupric hydroxide [ Cu(OH)2 ] are bases but these are not soluble in water but sodium hydroxide NaOH, calcium hydroxide Ca(OH)2 are bases and are also soluble in water.
Hence it is rightly said that all alkalis are bases but all bases are not alkalis.
Concept Insight : An alkali is a basic hydrooxide which when dissolved in water produces hydroxyl (OH-) ions as the only negatively charged ions.
Example : NaOH(aq) ⇌ Na+ + OH-
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संबंधित प्रश्न
What colour does phenolphthalein indicator turn when added to an alkali (such as sodium hydroxide)?
What happens when zinc granules are heated with sodium hydroxide solution? Write the equation of the reaction which takes place.
It has been found that rubbing vinegar on the stung area of the skin of a person gives him relief. The person has been stung by ______.
Give two examples of the following:
oxy-acid
What is the difference between an alkali and a base?
Give the name and formula of two : Weak dibasic acids
Fill in the missing data in the following table
| Name of the salt | Formula | Salt obtained from | ||
| Base | Acid | |||
| (i) | Ammonium chloride | NH4Cl | NH4OH | ______ |
| (ii) | Copper sulphate | ______ | ______ | H2SO4 |
| (iii) | Sodium chloride | NaCl | NaOH | ______ |
| (iv) | Magnesium nitrate | Mg(NO3)2 | ______ | HNO3 |
| (v) | Potassium sulphate | K2SO4 | ______ | ______ |
| (vi) |
Calcium nitrate | Ca(NO3)2 | Ca(OH)2 | ______ |
Which is the strongest acid in the following?
Explain the following:
H3PO3 is not a tribasic acid.
The acid which contains four hydrogen atoms ______.
