**1. ନିମ୍ନ ପଦାର୍ଥମାନଙ୍କର ସଂକେତ ଲେଖ । ଭିନ୍ନ ସମୟରେ ଗୋଟିଏ ଲେଖାଏଁ ସେଟ୍ ର ସଂକେତ ଲେଖି, ନିଜ ଭୁଲକୁ ଯୋଜ୍ୟତା ସାରଣୀ ଦେଖି ବାହାର କର । ବାରମ୍ବାର ଯୋଜ୍ୟତା ସାରଣୀ ଦେଖ ।** ***Set I:*** calcium acetate, potassium manganate, magnesium hypochlorite, ferric sulphate, mercury(II) nitrate, ammonium bicarbonate, cuprous sulphide, aluminium bromide, zinc sulphite, nitrous acid, ***Set II:*** sodium chromate, magnesium chloride, potassium phosphate, calcium phosphide, tin(II)sulphide, plumbouscarbonate, ferrous nitrite, mercurous hydrogen carbonate, ammonium chlorate, hydrobromic acid ***Set III:*** sodium phosphate, calcium sulphate, potassium dichromate, magnesium chlorite, stannic chloride, aluminium carbide, silver nitrite, cobalt(II) sulphide, ferric sulphite, calcium manganate ***Set IV:*** magnesium bicarbonate, sodium cyanide, iron(II) sulphate, chromium(III) hydroxide, zinc thiosulphate, potassium ferrocyanide, ammonium dichromate, arsenous nitrate, cupricbicarbonate, hypochlorous acid ***Set V:*** strontium nitrate, potassium sulphite, cupric ferrocyanide, aluminium phosphide, plumbous acetate, cuprous carbonate, sodium bicarbonate, chromic oxide, magnesium perchlorate, phosphoric acid(orthophosphoric acid) ***Set VI:*** potassium hydrogen phosphite, sodium thiosulphate, ferrous phosphate, calcium ferricyanide, stannous oxide, lead(IV) oxide(lead dioxide), mercuric dichromate,