1.

An inorganic salt when heated with concentrated H_(2)SO_(4) evolves a colourless pungent smelling gas but with concentrated H_(2)SO_(4) and MnO_(2) evolves a coloured pungent smelling gas which bleaches moist litmus paper.The coloured gas is:

Answer»

`NO_(2)`<BR>`Cl_(2)`
`Br_(2)`
`I_(2)`

SOLUTION :`Cl^(-)+H_(2)SO_(4) to HCl uarr ("colourless") +HSO_(4)^(-)`
`MnO(OH)_(2)+2H_(2)SO_(4)+2Cl^(-) to Mn^(2+) +Cl_(2) uarr ("yellowish green")+2SO_(4)^(2-)+3H_(2)O`
`Cl_(2)+H_(2)O to 2HCl+[O]`
`Cl_(2)` is a yellowish green gas which bleaches LITMUS paper by oxidation.


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