Compound $X$ is tested and the results are shown in the table. Test Result Aqueous $NaOH$ is added, then heated gently. Gas given off which turns damp red litmus paper blue. Dilute $HCl$ is added. Effervescence, gas given off which turns lime water milky and acidified $K_2Cr_2O_7$ paper green.
Which ions are present in compound $X$?
| Test | Result |
| Aqueous $NaOH$ is added, then heated gently. | Gas given off which turns damp red litmus paper blue. |
| Dilute $HCl$ is added. | Effervescence, gas given off which turns lime water milky and acidified $K_2Cr_2O_7$ paper green. |
- AAmmonium ions and sulphite ions
- BAmmonium ions and carbonate ions
- CSodium ions and carbonate ions
- DAmmonium ions and sulphate ions
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