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

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?

Given below are two statements:
Statement $I$: Colourless cupric metaborate is reduced to cuprous metaborate in a luminous flame.
Statement $II$: Cuprous metaborate is obtained by heating boric anhydride and copper sulphate in a non-luminous flame.
In the light of the above statements,choose the most appropriate answer from the options given below.

Which pair of cations can be identified by the borax bead test?

Which of the following gives the chromyl chloride test?

Assign $A, B, C, D$ from the given type of reaction.
$MCrO_4 \downarrow (M^{2+} = Ba^{2+}, Pb^{2+}) + AcOH \longrightarrow$ No dissolution