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Which of the following reactions do not ...

Which of the following reactions do not result in the preparation of potassium dichromate?
(I) `4FeCr_2O_4+8 Na_2CO_3+7O_2to`
(II) `Na_2CrO_4+H_2SO_4 to `
(III) `Na_2Cr_2 O_7 + 2KCl to `

A

I and II

B

II and III

C

I and III

D

I, II, and III

Text Solution

Verified by Experts

The correct Answer is:
A
(I) `4FeCr_2O_4+8 Na_2CO_3+7O_2to 8Na_2CrO_4+2Fe_2O_3+8CO_2`
(II) `2Na_2CrO_4+H_2SO_4toNa_2Cr_2O_7+Na_2SO_4+H_2O`
(III) `Na_2Cr_2O_7+2KCl to K_2Cr_2O_7+2NaCl`
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Na_(2)O_(2) + H_(2)SO_(4) to

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 :

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 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 :

Write the preparation of following : (i) KMnO_4 from K_2MnO_4 (ii) Na_2CrO_4 from FeCr_2O_4 (iii) Cr_2O_(7)^(2-) from Cr_2O_(4)^(2-)

NCERT FINGERTIPS-THE D- AND F- BLOCK ELEMENTS -Some Important Compounds Of Transition Elements
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