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प्रश्न
Distinguish by a chemical test sodium carbonate and sodium sulphite.
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उत्तर
Sodium chloride reacts with H2SO4 to produce HCl gas, while sodium sulphite reacts with H2SO4 to produce sulphur dioxide gas.
\[\ce{Na2CO3 + H2SO4 -> Na2SO4 + H2O + CO2}\]
Sodium sulphite when added to a dilute solution. Sulphuric acid releases a colourless gas with a burning sulphur odour and changes acidified potassium dichromate paper from orange to green.
\[\ce{Na2SO3 + H2SO4 -> Na2SO4 + H2O + SO2}\]
\[\ce{\underset{(Orange)}{K2Cr2O7} + 3SO2 + H2SO4 -> K2SO4 + \underset{(Green)}{Cr2(SO4)3} + H2O}\]
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संबंधित प्रश्न
Identify the substance underlined, in the following case
A solid formed by reaction of two gases, one of which is acidic and the other basic in nature
The salt prepared by the method of direct combination is _______.
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\[\ce{NaCl + NH3 + H2O + CO2 ->}\]
Write the names, formulae and colours of any two hydrated salts.
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The aqueous solution of one of the following salts will turn red litmus to blue. This salt is:
Taking sodium carbonate as an example, give the meaning of the following terms:
Water of crystallization
Taking sodium carbonate as an example, give the meaning of the following terms:
Anhydrous
Name two carbonates which do not produce carbon dioxide on heating.
Copy and complete the following table which refers to the action of heat on some carbonates:
| Carbonate | Colour of residue on cooling |
| Zinc Carbonate | |
| Lead carbonate | |
| Copper carbonate |
