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प्रश्न
How will you differentiate between compounds containing sulphate and sulphite just by preliminary test?
फरक स्पष्ट करा
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उत्तर
| Sulphate | Sulphite |
|---|---|
| On adding dilute hydrochloric acid, no gas is evolved. | On adding dilute hydrochloric acid, sulphur dioxide (SO2) gas is evolved. |
| There is no effervescence. | Effervescence occurs and the gas has a pungent, choking smell. |
| Hence, the absence of gas indicates the possible presence of sulphate ion. | Hence, the evolution of SO2 indicates the presence of sulphite ion. |
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