Which of the following pairs of elements cannot form an alloy
$Zn,\,Cu$
$Fe,\,Hg$
$Fe,\,C$
$Hg,\,Na$
Most stable compound among the following is
Metal used for making joints in jewellery is
The only cations present in a slightly acidic solutions are $Fe^{3+},\,Zn^{2+}$ and $Cu^{2+}$. The reagent that when added in excess to this solution would identify and separate $Fe^{3+}$ in one step is
Which of the following compounds show colour due to $d-d$ transition?
Coloured salts are formed by