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(A) Test $1$: The reaction with aqueous $NaOH$ and gentle heating produces $NH_3$ gas (which turns damp red litmus blue),indicating the presence of am

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Ammonium ions and sulphite ions

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(A) Test $1$: The reaction with aqueous $NaOH$ and gentle heating produces $NH_3$ gas (which turns damp red litmus blue),indicating the presence of ammonium ions $(NH_4^+)$. Test $2$: The reaction with dilute $HCl$ produces $SO_2$ gas (which turns lime water milky and acidified $K_2Cr_2O_7$ paper green),indicating the presence of sulphite ions $(SO_3^{2-})$. Carbonate ions would turn lime water milky but would not change the color of acidified $K_2Cr_2O_7$. Therefore,compound $X$ contains ammonium and sulphite ions.

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.

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