Question

A balck powder when heated with Conc. HCI gives a greenish yellow. Gas. The gas as an oxidising and bleaching agent. When it is passed over slake lime, a white poweder is formed which is a ready source of gas. The back powder and white powder respectively are
A. `KClO_(3) and NaClO_(3)`
B. `MnO_(2) and Ca(OCl)_(2)`
C. `MnO_(2) and KClO_(3)`
D. `MnCl_(4) and COCl_(2)`

Answer 1

Correct Answer - B
`underset("powder")underset("Black")(MnO_(2))+underset("(conc.)")(4HCl)rarrMnCl_(2)+2H_(2)O+underset("yellow gas")underset("Greenish")(Cl_(2))Cl_(2)+H_(2)Orarr2HCl+[O]" Coloured matter"+[O]rarr" Colourless matter "`
`underset("lime")underset("Slaked")(2Ca(OH)_(2))+2Cl_(2)rarrunderset("(white)")underset("powder")underset("Bleaching")(Ca(OCl)_(2))+CaCl_(2)+2H_(2)O`