In Acidic Medium H2O2 changes K2Cr2O7 to CrO5 (deep Violet Solution In Ether) Having Two Peroxy Linkage. Oxidation Number Of Cr In CrO5 is:

At pH = 4,  exists as:

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

The species that undergoes disproprotionation in an alkaline medium are

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.