The species that undergoes disproprotionation in an alkaline medium are
None of these
undergoes disproportionation, ie., oxidation and reduction of same element simultaneously, in the alkaline medium.
is stable in strong alkali solution and disproportionate into and MnO2 in less basic, acidic and neutral medium.
At pH = 4, exists as:
In acidic medium H2O2 changes K2Cr2O7 to CrO5 (deep violet solution in ether) having two peroxy linkage. Oxidation number of Cr in CrO5 is:
Hg2Cl2 ionises as ……... and cation has ……… unpaired electron (s).
Transition metals form alloys easily. The reason for this is
An inorganic compound on strong heating gave a blackish brown powder and two oxides of sulphur. The powder was dissolved in HCl when a yellow solution was obtained which gave a blood red coloured solution with thiocyanide ions. The inorganic compound may be
In industrial smog, Cu corrodes to
IE1 of Cu (3d10 4s1) is less than that of Zn (3d10 4s2) because it is easy to remove an electron from a half-filled s-orbital as compared to fully-filled s-orbital. However, in case of IE2, the electron is lost from 3d orbital of Cu and 4s orbital of Zn and loss of electron from 4s orbital is easier as compared to fully-filled 3d orbital.
An inorganic compound (A) gave the following reactions
(i) The compound on heating gave a residue and a gaseous mixture of NO2and O2.
(ii) The aqueous solution of (A) gave a white precipitate with sodium chloride solution. The precipitate dissolves in NH4OH. The compound (A) is
Silver nitrate produces a black strain on skin due to
A metal, M which is not affected by strong acids and strong bases but dissolves in aqua-regia forms MCl3 which is used for toning in photography. The metal M is