Question

In the chemical reaction
kr2cr2o7 + aH2SO4 +bSO2 = KR2SO4 +cr2(SO4)3 +cH2O. a b and c are

1. 1,3,1

2. 4,1,4

3. 3,2,3

4. 2,1,2

Answer 1

K2Cr2VIO7 + 3 SIVO2 + H2SVIO4 → Cr2III(SVIO4)3 + K2SVIO4 + H2O .

This is an oxidation-reduction (redox) reaction:

3 SIV - 6 e- → 3 SVI (oxidation)

2 CrVI + 6 e- → 2 CrIII (reduction)

Change the oxidation states.

Answer 2

1. 1,3,1
It's just balancing