1.

To an acidified solution, a pinch of Na_(2)O_(2) is added and shaken. What is observed?

Answer»

Blue colour
Orange colour changing to green
COPIOUS EVOLUTION of oxygen
Bluish-green precipitate

Solution :`underset("orange")(Cr_(2)O_(7)^(2-))+10H^(+)+2Na_(2)O_(2) to (##BLJ_VKJ_ORG_CHE_C08_E04_013_S01##) +8Na^(+)+5H_(2)O`
In the absence of ether or amyl ALCOHOL, `CrO_(3)` in acidic medium decomposes to `Cr^(3+)` with evolution ofoxygen.


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