Explanation
German silver does not contain Ag at all.
(2) Electron alloy contains Mg (95%) + Zn (5%)
(1) Parke’s Process.
Fe and Pt donot form amalgams.
Ag is purified form Pb by heating impure silver in the presence of blast of air when Pb is oxidized to PbO which is blown away leaving only Ag.
(4) Silver
Steel contains Fe, Mn, C (manganese steel)
Bell metal is an alloy of Cu (80%), Sn (20%).
CuSO4 + Fe → FeSO4 + Cu (reduction of copper).
(4) Fe.
Slag is lighter, infusible (higher melting ) than the metal.
CuSO4.5H2O has the blue colour.
Cu(OH)2 + 4NH4OH → [Cu(NH3)](OH)2 + 4H2O
(3) Conc. KOH
Earlier coins contained Ag, Cu and Ni as their constituents.
Common oxidation states of Ti are + 3 and +4.
V4+ (d1 configuration) ion is coloured.
Actinides have variable valency due to very small difference in energies of 5f, 6d and 7s orbitals.
Coinage metals (Cu, Ag, Au ) show the properties of transitional elements as in their common oxidation states they posses partially filled d-subshells.
Common oxidation states of Sc( 3d1 4s2) are + 2 and + 3.
Argentile is Ag2S and cuprite is Cu2O.
Water is oxidised to O2 in biological process by Mn.
Addition of high proportion of Mn gives hardness to steel which is used for making rails of rail roads.
Mn shows the highest +7 oxidation state followed by Cr which shows +6 oxidation state.
Brass contains Cu and Zn.
FeCl3 + 3H2O → Fe(OH)3 + 3HCl
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