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Na(2)O(2) + H(2)SO(4) to...

`Na_(2)O_(2) + H_(2)SO_(4) to`

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`Na_(2)O_(2) + H_(2)SO_(4) to Na_(2)SO_(4) + H_(2)O_(2)`
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To an acidified dichromate solution, a pinch of Na_(2)O_(2) is added and shaken. Na_(2)Cr_(2)O_(7) +4Na_(2)O_(2)+5H_(2)SO_(4) to 2(A)+5(B)+5H_(2)O . Compound (A) is blue coloured The sum of the total number of atoms in one molecule of (A) and (B) is

Na_(2)O_(2) + H_(2)O to

The equiv. wt. of hypo in the reaction Na_(2) S_(2) O_(3) + Cl_(2) + H_(2) O rarr Na_(2) SO_(4) + H_(2) SO_(4) + HCl is -

The equiv. wt. of hypo in the reaction Na_(2) S_(2) O_(3) + Cl_(2) + H_(2) O rarr Na_(2) SO_(4) + H_(2) SO_(4) + HCl is -

K_(2)Cr_(2)O_(7) is obtained in the following steps: 2FeCrO_(4)+2Na_(2)CO_(3)+OtoFe_(2)O_(3)+2Na_(2)CrO_(4)+2CO_(2) 2Na_(2)CrO_(4)+H_(2)SO_(4)toNa_(2)Cr_(2)O_(7)+H_(2)O+Na_(2)SO_(4) Na_(2)Cr_(2)O_(7)+2KCltoK_(2)Cr_(2)+2NaCl To get 0.25 " mol of " K_(2)Cr_(2)O_(7) , " mol of " 50% pure FeCrO_(4) required.

Potassium dichromate (K_(2)Cr_(2)O_(7)) is an orange coloured compound , very frequently used in laboratory as an oxidising agent as well as in a redox titration. It is generally prepared from chromite (FeCr_(2)O_(4)) ore according to the following reactions: (1) Fusion of chromite ore with sodium carbonate in excess of air. FeCr_(2)O_(4) + Na_(2)CO_(3) + O_(2) rarr Na_(2)CrO_(4)+Fe_(2)O_(3) +CO_(2) (2) Acidifing filtered sodium chromate solution with sulphuric acid. Na_(2)CrO_(4) + H_(2)SO_(4) rarr Na_(2)Cr_(2)O_(7) + Na_(2)SO_(4) + H_(2)O (3) Treating sodium dichormate with potassium choride . Na_(2)Cr_(2)O_(7) + KCl rarr K_(2)Cr_(2)O_(7) + NaCl If the number of moles of reactant available for reaction are : [FeCr_(2)O_(4)=0.25 "moles" , O_(2)=0.35 "moles", Na_(2)CO_(3)=0.60 "moles", H_(2)SO_(4)=0.2 "moles", KCl=0.4 "moles"] , then the maximum number of moles of K_(2)Cr_(2)O_(7) , that can be produced is :

Aniline on oxidation with Na_(2)Cr_(2)O_(7) and H_(2)SO_(4) gives