[" 11.When potassium dichromate crystals are heated with conce "],[(HCl)/(" (a) "O_(2))" is evolved "],[" (b) Chromyl chloride vapours are evolved "],[" (c) Cl_2 " is evolved " "],[" (d) No reaction takes place "],[" (d) No reaction takes place "],[" (d) No reaction takes place "],[" (d) No reaction takes place "],[" (d) No reaction takes place "]