1.

8.7 gm of a sample of MnO_2(molar mass = 87) is used in a chemical reaction with HCl to release Cl_2Released Cl_2is used to displace I_2from excess of KI solution. The iodine hence released is estimated using hypo and consumes 100 ml of hypo solution.12.5 ml of same hypo solution is required for complete reaction with 25 ml of 0.5 N I_2solution. Number of mili of iodine in the solution used with hypo are

Answer»

4.35
43
50
6.25

Solution :OXIDATION NUMBER of SODIUM in sodium AMALGAM is 0


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