The metal that does not give the borax-bead test is

The products $A$ and $B$ formed in the following reactions are:
$CrO_2Cl_2 + 4NaOH \rightarrow A + 2NaCl + 2H_2O$
$A + 2HCl + 2H_2O_2 \rightarrow B + 3H_2O$

How is sodium chromate converted into sodium dichromate in the manufacture of potassium dichromate from chromite ore?

Which of the following compounds shows colour due to $d-d$ transition?

Which compound of zinc is white in the cold state and turns yellow in the hot state?

The green colour produced in the borax bead test of a chromium$(III)$ salt is due to formation of . . . . . . :