When sodium chloride is heated with concentrated $H_2SO_4$ and solid potassium dichromate,which compound containing $Cr$ in the $+6$ oxidation state is formed as a gas?

The compound called microcosmic salt is

The microcosmic salt is

If steel is heated to a temperature well below red heat and is then cooled slowly,the process is called

Which salt is used during the bead test in the qualitative analysis of inorganic substances?

$A$ chemistry student trying to detect the metallic ion in a salt,makes a paste on a clean platinum wire loop of the salt with concentrated $HCl$. When he takes a small amount of this paste and keeps it in a non-luminous Bunsen flame,the colour of the flame changes to grassy green. He should,therefore,conclude that the metal is