Anhydrous ferric chloride is prepared by:
dissoving Fe(OH)3 in concentrated HCl
dissolving Fe(OH)3 in dilute HCl
passing dry HCl overheated iron scrap
passing dry Cl2 gas overheated iron scrap
When H2S gas is passed in a metal sulphate solution in presence of NH4OH, a white precipitate is produced. The metal is identified as:
Zn
Fe
Pb
Hg
Which of the following is philosopher's wool ?
ZnO
HgO
Ag2O
CuO
A.
ZnO
ZnO is known as philosopher's wool because it is very light, white, soft wooly powder.
84Rn219 is a member of actinium series. The other member of this series is-
89Ac225
90Th232
15P35
92U235