Chemistry - Salt Analysis Question with Solution | TestHub

ChemistrySalt AnalysisTEST OF ANIONS CLASS A-SUBGROUP IIEasy2 minPYQ_2014

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The gas evolved on heating ${CaF}_{2}$ and ${SiO}_{2}$ with concentrated $H_{2} {SO}_{4}$ , on hydrolysis gives a white gelatinous precipitate. The precipitate is:

Options:

Answer:

Solution:

Reactions involved are
$\begin{matrix} {CaF}_{2} + H_{2} {SO}_{4} (Conc .) & \overset{Δ}{\to} & {CaSO}_{4} + 2 HF (g) \\ {SiO}_{2} + 4 HF (g) & \overset{Δ}{\to} & {SiF}_{4} (g) + 2 H_{2} O \\ 3 {SiF}_{4} + 2 H_{2} O & \to & 2 H_{2} {SiF}_{6} + {SiO}_{2} \end{matrix}$

The mixture after hydrolysis apperas as white gelatinous precipitate.

Stream:JEESubject:ChemistryTopic:Salt AnalysisSubtopic:TEST OF ANIONS CLASS A-SUBGROUP II

⏱ 2mℹ️ Source: PYQ_2014

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