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Potassium dichromate (K(2)Cr(2)O(7)) is ...

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 you are initially provided with 224 gm of pure chromite ore and 169.6 gm of sodium carbonate , the minimum volume of air required at 1 atm and 273 K to consume at least one of the reactant completely, if air contains 20% by volume of oxygen gas is :

A

156.8 L

B

196 L

C

28 L

D

152.4 L

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The correct Answer is:
A
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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 whole of the chormite ore given in the previous question gets consumed and sufficient amount of rest of the reactants are given, then the mass of K_(2)Cr_(2)O_(7) obtained is:

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)CrO_(4)+HCl to H_(2)Cr_(2)O_(7)+Na_(2)SO_(4)

FeCr_(2)O_(4)+Na_(2)CO_(3)+O_(2) to Fe_(2)O_(3)darr+Na_(2)CrO_(4)

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

GRB PUBLICATION-MOLE CONCEPT, STOICHIOMETRY & CONCENTRATION TERMS-Comprehension#105
  1. Potassium dichromate (K(2)Cr(2)O(7)) is an orange coloured compound , ...

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