Which of the following contain $'Sn'$ metal
German Silver
Solder
Bauxite
Thomas-slage
An oxide of copper which is red in colour has the formula
A pink colored salt on dry heating becomes blue in colour. Salt may contain
In nitroprusside ion, the iron exists as $Fe^{2+}$ and $NO$ as $NO^+$ rather than $Fe^{3+}$ and $NO$ respectively. These forms of ions are established with the help of
Which of the following ions will exhibit colour in aqueous solutions?
Which of the following may be colourless