Practical Chemistry

Compound X is tested and the results are shown in the table.


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Test	Result
Aqueous sodium hydroxide is added, then heated gently. Dilute hydrochloric acid is added.	Gas given off which turns damp red litmus paper blue. Effervescence, gas given off which turns lime water milky and acidified \({K_2}C{r_2}{O_7}\) paper green.

Which ions are present in compound 'X'?