question_answer

A black powder when heated with cone. HCl gives a greenish yellow gas. The gas acts as an oxidising and a bleaching agent. When it is passed over slaked lime, a white powder is formed which is a ready source of gas. The black powder and white powder respectively are

A) \[KCl{{O}_{3}}\]and \[NACl{{O}_{3}}\]

B) \[Mn{{O}_{2}}\] and \[Ca{{(OCl)}_{2}}\]

C) \[Mn{{O}_{2}}\] and \[KCl{{O}_{3}}\]

D) \[MnC{{l}_{4}}\]and \[COC{{l}_{2}}\]

Correct Answer: B

Solution :

\[C{{l}_{2}}+{{H}_{2}}O\to 2HCl+\left[ O \right]\] Coloured matter + [O]\[\to \] Colourless matter