Na(2)CO(3)+Fe(2)O(3)rarr A+CO(2), what i...

`Na_(2)CO_(3)+Fe_(2)O_(3)rarr A+CO_(2)`, what is A in the reaction ?

`NaFeO_(2)`

`Na_(3)FeO_(3)`

`Fe_(3)O_(4)`

`Na_(2)FeO_(2)`

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A 2.0 g of mixture of Na_(2)CO_(3) and NaHCO_(3) loses 0.248 g when heated to 300^(@)C , the temperature at which NaHCO_(3) decomposes to Na_(2)CO_(3) , CO_(2) , the temperature at which NaHCO_(3) decomposes to Na_(2) CO_(3), CO_(3) and H_(2) O . What is the percentage of Na_(2) CO_(3) in mixture?

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 :

Na_(2)CO_(3)+H_(2)O+CO_(2)rarr(A). White crystalline powder (A) on reaction with phenolphthalein gives

Find Delta H_(f)^(@) of Fe_(2)O_(3)(s) if the standard heat reaction Fe_(2)O_(3)(s)+3CO(g)rarr 2Fe(s)+3CO_(2)(g) is -6.6 kcal. Given Delta H_(f)^(@)CO(g)=-26.4 kcal. Delta H_(f)^(@)CO_(2)(g)=-94 kcal .

NARAYNA-S-BLOCK ELEMENTS-Level V-(ONLY ONE ANSWER CORRECT )

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