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  4. A salt of textNaX overset textMgCl2 arrow white ppt. on boiling. Thus, anion X is:

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Q. A salt of $\text{NaX} \, \overset{\text{MgCl}_{2}}{ \rightarrow }$ white ppt. on boiling. Thus, anion $X$ is:

NTA AbhyasNTA Abhyas 2020

Solution:

Sodium bicarbonate with magnesium chloride solution gives magnesium bicarbonate which is water soluble. On heating bicarbonate decomposes to carbonate, white ppt.