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

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.

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

The transition elements are more metallic than the representative elements because they have