The metal that does not give the borax bead test is

Which of the following statements is not true?

What is the color of $K_2MnO_4$?

The compounds formed when $KMnO_4$ is heated to $513 \ K$ are . . . . . .

$Cr_2O_7^{2-} / H^{\oplus}$ $\xrightarrow[200^{\circ}C]{H_2O_2} 'X'$ $\xrightarrow{\text{On Standing}} 'Y'_{(aq. sol)}$
Select the correct option for $'X'$ and $'Y'$

Which of the following oxides is amphoteric?