Convert (i) `NaHCO_(3)` (ii) `Na_(2)CO_(3)` to unstable carbonic acid by action with dil `H_(2)SO_(4)`.
State the reason why ammonia is evolved when an ammonium salt and alkali are heated

When oxalic acid is heated with concentrated H_(2) SO_(4) it produces

Assertion (A): Na_(2)S_(2)O_(3) is a salt of unstable acid. Reason (R) : H_(2)S_(2)O_(3) is a polyprotic acid.

When formic acid or oxalic acid is treated with conc. H_(2)SO_(4) , the gas evolved is

Which of the following salt on heating with concentrated H_(2)SO_(4) , coloured vapours do not evolve?

Which gas is evolved when formic acid is heated with conc. H_2 SO_4 ?

Sodium sulphite (Na_(2)SO_(3)) is added to meat as a preservative. The presence of Na_(2)SO_(4) can be detected by adding dil. H_(2)SO_(4) when the pungent smelling gas evolved turns the lime water milky. The gas evolved was detected as sulphur dioxide. The SO_(2) " to "SO_(4)^(2-) in titration. SO_(2)+2H_(2)O+I_(2) to 4H^(+)+SO_(4)^(2-)+2I^(-) In order to check the results of titration, excess barium chloride is added to the final solution. The resulting precipitate is collected and weighed. Q. Which of the following compounds is formed, when Na_(2)SO_(3) is boiled with sulphur.

Sodium sulphite (Na_(2)SO_(3)) is added to meat as a preservative. The presence of Na_(2)SO_(4) can be detected by adding dil. H_(2)SO_(4) when the pungent smelling gas evolved turns the lime water milky. The gas evolved was detected as sulphur dioxide. The SO_(2) " to "SO_(4)^(2-) in titration. SO_(2)+2H_(2)O+I_(2) to 4H^(+)+SO_(4)^(2-)+2I^(-) In order to check the results of titration, excess barium chloride is added to the final solution. The resulting precipitate is collected and weighed. Q. Which of the following compounds is formed, when Na_(2)SO_(3) is boiled with sulphur.

Sodium sulphite (Na_(2)SO_(3)) is added to meat as a preservative. The presence of Na_(2)SO_(3) can be detected by adding dil. H_(2)SO_(4) when the pungent smelling gas evolved turns the lime water milky. The gas evolved was detected as sulphur dioxide. The SO_(2) " to "SO_(4)^(2-) in titration. SO_(2)+2H_(2)O+I_(2) to 4H^(+)+SO_(4)^(2-)+2I^(-) In order to check the results of titration, excess barium chloride is added to the final solution. The resulting precipitate is collected and weighed. Q. SO_(2) gas is used as bleaching agent. Its bleaching action is :

The gas evolved on heating Na_(2)CO_(3) is

Sodium sulphite (Na_(2)SO_(3)) is added to meat as a preservative. The presence of Na_(2)SO_(4) can be detected by adding dil. H_(2)SO_(4) when the pungent smelling gas evolved turns the lime water milky. The gas evolved was detected as sulphur dioxide. The SO_(2) " to "SO_(4)^(2-) in titration. SO_(2)+2H_(2)O+I_(2) to 4H^(+)+SO_(4)^(2-)+2I^(-) In order to check the results of titration, excess barium chloride is added to the final solution. The resulting precipitate is collected and weighed. Q. SO_(2) gas is used as bleaching agent. Its bleaching action is :