Question

Substance C is a coloured, crystalline salt on heating decomposes leaving a black residue T. On addition of
Cu turnings and conc. H2SO4 to C a coloured acidic gas U is evolved on heating. A solution of C is added to
NaOH solution until in excess. A pale blue ppt. is obtained insoluble in excess of NaOH. A solution of C is then
added to NH4OH solution in excess to give an inky blue solution V. A solution of C is warmed and H2S gas is
passed through it. A black ppt W appears. Identify C, T, U, V, W

Answer 1

Answer:

c-CuSO4

w-CuS

p-Cu(OH)2

v-FeSO4

T-Cu2+