Multiple choice

Dichromate ion in acidic medium oxidise stannous ion as: xSn2+ + yCr2O72– + zH+ → aSn4+ + bCr3+ + cH2O for the above reaction,

  1. the value of x : y = 1 : 3

  2. the value of x + y + z = 18

  3. a : b = 2 : 3

  4. the value of z – c = 5

  5. none of these
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The reaction can be given as: Reduction half→Cr2O72– + 14H+ + 6e →  2Cr3+ + 7H2O Oxidation half→[Sn2+ – 2e → Sn4+]*3 So the balanced chemical equation is 3Sn2+ + Cr2O72– +14H+ = 3Sn4+ + 2Cr3+ + 7H2O therefore, x + y + z = 18, hence this is a correct option.  

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