Which of the following is used as white pigment
$Ti{O_2}$
${V_2}{O_5}$
$CuO$
$HgO$
Many transition metals form interstitial compounds. The characteristics of these interstitial compounds are
$(I)$ They have high melting points, higher than those of pure metals
$(II)$ They are very hard
$(III)$ They retain metallic conductivity
$(IV)$ They are chemically more reactive than the pure metals
Which of the following pair of elements cannot form an alloy
The metal ion which does not form coloured compound is
Which of the following is not correct about transition metals
Besides $Zn$ and $Cu$, german silver contains the metal