Transition metals form alloys easily. The reason for this is


Correct option is

Similar size

Transition metals are quite similar in atomic size. Therefore, the atoms of one metal can substitute the atoms of other metal in its crystal lattice. Thus, on cooling a mixture, solution of two or more transition metals, ie, smooth solid alloy, is formed.



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).


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.



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