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  • A sodium salt on reaction with gives white precipitate only on heating. The sodium salt is:

A sodium salt on reaction with \mathrm{MgCl}_2 gives white precipitate only on heating. The sodium salt is:

Option: 1

\mathrm{Na}_2 \mathrm{SO}_4


Option: 2

\mathrm{Na}_2 \mathrm{CO}_3


Option: 3

\mathrm{NaHCO}_3


Option: 4

\mathrm{NaNO}_3


Answers (1)

best_answer

\mathrm{MgCl}_2+2 \mathrm{NaHCO}_3 \rightarrow \mathrm{Mg}\left(\mathrm{HCO}_3\right)_2+2 \mathrm{NaCl}

\mathrm{Mg}\left(\mathrm{HCO}_3\right)_2 is soluble but on heating, it gives white colour precipitate.

\mathrm{Mg}\left(\mathrm{HCO}_3\right)_2+\text { Heat } \longrightarrow \mathrm{MgCO}_3(\text { white }) \downarrow+\mathrm{H}_2 \mathrm{O}+\mathrm{CO}_2

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Riya

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