Which of the following gives the chromyl chloride test?

Identify the type of precipitate formed in the following reaction: $(NH_4)_2SO_4 + Ba(OH)_2 \longrightarrow BaSO_4 \downarrow + 2NH_3 \uparrow$

Which of the following solid salt on heating with solid $K_2Cr_2O_7$ and conc. $H_2SO_4$ evolves orange-red vapours that turn an aqueous $NaOH$ solution yellow?

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

Which ion gives a violet-coloured bead in the borax bead test?

Starch paper is used to test for the presence of