Amphoteric oxide$(s)$ of $Mn$ is/are:

Presence of $Cr$ in steel makes it

Stainless steel is an alloy of which of the following metals?

Which Lanthanoid compound is used as a pigment?

An acidified solution of potassium chromate was layered with an equal volume of amyl alcohol. When it was shaken after the addition of $1 \ mL$ of $3 \% \ H_2O_2$,a blue alcohol layer was obtained. The blue color is due to the formation of a chromium$(VI)$ compound '$X$'. What is the number of oxygen atoms bonded to chromium through only single bonds in a molecule of $X$ ?

$CoO \cdot Al_2O_3$ is called