Question

a water insoluble substance 'x' on reacting with dil. h2so4 releases a colourless gas accompanied by brisk effervesence . when the gas was passed through water, the solution obtained turns blue litmus red. identify 'x'.and write the chemical eq.involved

Answer 1

$$\begin{gathered} {\text{When calcium carbonate react with dil H}}_{\text{2}}{\text{SO}}_{\text{4}}\text{it results in the formation of calcium sulphate, water and carbon dioxide.} \\ \mathrm{When}\mathrm{carbon}\mathrm{dioxide}\mathrm{is}\mathrm{evolved}\mathrm{it}\mathrm{results}\mathrm{in}\mathrm{the}\mathrm{formation}\mathrm{of}\mathrm{effervesence}.\mathrm{The}\mathrm{solution}\mathrm{containing}\mathrm{carbon}\mathrm{dioxide}\mathrm{and}\mathrm{water}\mathrm{turns}\mathrm{blue}\mathrm{litmus}\mathrm{to}\mathrm{red}\mathrm{litmus}.\mathrm{It}\mathrm{shows}\mathrm{that}\mathrm{solution}\mathrm{is}\mathrm{acidic}\mathrm{in}\mathrm{nature}. \\ \mathrm{Reaction}:\hspace{0.17em}{\mathrm{CaCO}}_3+\hspace{0.17em}{\mathrm{H}}_{\text{2}}{\text{SO}}_{\text{4}}\to \mathrm{Ca}{\text{SO}}_{\text{4}}+\hspace{0.17em}{\mathrm{H}}_2\mathrm{O}+\hspace{0.17em}{\mathrm{CO}}_2 \\ \mathrm{X}\mathrm{is}{\mathrm{CaCO}}_3 \\ \mathrm{Regards} \end{gathered}$$Dear Student,