Which of the following compositions is found in dental amalgam alloys?

Write about the oxides and oxoanions of transition metals.

The spin only magnetic moment $(\mu)$ value $(B.M.)$ of the compound with strongest oxidising power among $Mn_2O_3$,$TiO$,and $VO$ is $....$ $B.M.$ (Nearest integer).

Choose the correct statements from the following:
$A$. $Mn_2O_7$ is an oil at room temperature.
$B$. $V_2O_4$ reacts with acid to give $VO^{2+}$ ions.
$C$. $CrO$ is a basic oxide.
$D$. $V_2O_5$ does not react with acid.
Choose the correct answer from the options given below:

Which Lanthanoid compound is used as a pigment?

The orange colour of $K_2Cr_2O_7$ and purple colour of $KMnO_4$ is due to