Some amount of ..20V..H_(2)O_(2) is mixed with excess of acidifeid solution KI. The iodine so liberated required 200ml of 0.IN Na_(2)S_(2)O_3for tritration. The mass of K_(2)Cr_(2)O_7 needed to oxidises the above volume of H_2O_2 solution :

Some amount of ..20V..H_(2)O_(2) is mixed with excess of acidifeid sol

1.	Some amount of ..20V..H_(2)O_(2) is mixed with excess of acidifeid solution KI. The iodine so liberated required 200ml of 0.IN Na_(2)S_(2)O_3for tritration. The mass of K_(2)Cr_(2)O_7 needed to oxidises the above volume of H_2O_2 solution :
Answer» 3.6 G 0.8 g 4.2 g 0.98 g SOLUTION :`W/(49) =(20xx5.6)/(5.6 xx1000)` WT of `K_2Cr_2O_7=0.98` g