1.

Which of the following properties is/are common to both K_2Cr_2O_7 & KMnO_4 ?

Answer»

Both on heating form an oxosalt, a metal oxide & oxygen gas.
Both have their colour because of charge transfer spectrum.
Both behave as primary titrants as well as self-indicators in redox titrations.
Both from a slightly coloured precipitate with hydrogen sulphide in ACIDIC MEDIUM.

Solution :(A)Both on heating form an o x osalt `(K_2CrO_4 & K_2MnO_4)`, a metal oxide `(Cr_2O_3 & MnO_2)` & oxygen gas.
(B)Both have their colour (ORANGE and purple RESPECTIVELY) because of charge transfer spectrum (since no unpaired electrons).
(C )Only `K_2Cr_2O_7` behaves as primary titrant, while `KMnO_4` behaves as secondary titrant.
(D)Both form a slightly coloured precipitate (S) with hydrogen sulphide in acidic medium.


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