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.

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

The species that undergoes disproprotionation in an alkaline medium are

In industrial smog, Cu corrodes to

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

Transition elements exhibits variable valencies because they release electrons from the following orbits