Question

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

Solution

Correct option is

Au

 

Au is not affected by strong acids and strong bases. However, it dissolves in aqua-regia forming AuCl3 which is used for toning in photography. Thus, the metal, M is Au and the reaction are as follows :

                   

                 aqua-regia

                              

                                                       used in toning

                                                       in photography

SIMILAR QUESTIONS

Q1

Hg­2Cl2 ionises as ……... and cation has ……… unpaired electron (s).

Q2

Transition metals form alloys easily. The reason for this is

Q3

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

Q4

The species that undergoes disproprotionation in an alkaline medium are

Q5

In industrial smog, Cu corrodes to

Q6

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.

Q7

 

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

Q8

Silver nitrate produces a black strain on skin due to

Q9

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

Q10

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