Advertisements
Advertisements
प्रश्न
KMnO4 is coloured due to ______.
विकल्प
d-d transitions
charge transfer from ligand to metal
unpaired electrons in d orbital of Mn
charge transfer from metal to ligand
Advertisements
उत्तर
KMnO4 is coloured due to charge transfer from ligand to metal.
Explanation:
The Mn atom in KMnO4 has a +7 oxidation state with electron configuration [Ar]3d04s0. Since no unpaired electrons are present, d−d transitions are not possible. The molecule should, therefore, be colourless.
Its intense purple due to `"L"→"M"` (ligand to metal) charge transfer 2p(L) of O to 3d(M) of Mn.
APPEARS IN
संबंधित प्रश्न
Indicate the steps in the preparation of KMnO4 from pyrolusite ore.
Complete the following equations:
`2MnO_4^(-)+16H^++5S^(2-)rarr`
Complete the following equation :
Complete the following chemical equations :
Cu + H2SO4(conc.) →
E0 value for Mn3+ Mn2+ couple is much more positive than that for Cr3-/ Cr2-.
In the form of dichromate, \[\ce{Cr (VI)}\] is a strong oxidising agent in acidic medium but \[\ce{Mo (VI)}\] in \[\ce{MoO3}\] \[\ce{and W (VI)}\] in \[\ce{WO3}\] are not because:
(i) \[\ce{Cr(VI)}\] is more stable than \[\ce{Mo(VI)}\] and \[\ce{and W(VI)}\].
(ii) \[\ce{Mo(VI)}\] and \[\ce{and W(VI)}\] are more stable than \[\ce{Cr(VI)}\].
(iii) Higher oxidation states of heavier members of group-6 of transition series are more stable.
(iv) Lower oxidation states of heavier members of group-6 of transition series are more stable.
Potassium permanganate on heating at 513 K gives a product which is ______.
Potassium dichromate when heated with concentrated sulphuric acid and a soluble chloride, gives brown-red vapours of ______.
Indicate the steps in the preparation of \[\ce{K2Cr2O2}\] from chromite ore.
Indicate the steps in the preparation of \[\ce{K2Cr2O7}\] from chromite ore.
