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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
Give two examples of organic acids.
What type of ions are formed?
When an acid is dissolved in water.
Give two examples of the following:
monobasic acid
Write the chemical name from the given formula.
H2SO4
What is the difference between : An alkali and a metal hydroxide?
Choosing the correct words given in brackets, complete the sentence given below:
A(n) ______ (acid/basic) salt is one in which the hydrogen of an acid has been partially replaced by a ______ (metal/non-metal).
Since metal carbonate and metal bicarbonate are basic, they react with acids to give salt and water with the liberation of ______.
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 | ______ |
Write the important uses of hydrochloric acid and sulphuric acids.
Consider the acidity of the carboxylic acids:
(1) PhCOOH
(2) o-NO2C6H4COOH
(3) p-NO2C6H4COOH
(4) m-NO2C6H4COOH
