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Highly selective Backlog Qs for JEE MainChemistryRedox Reactions

A compound contains three elements X, Y and Z. The oxidation number of X, Y and Z are + 3 , + 5 and - 2 respectively. The possible formula of the compound is

Options

  1. AX 2 Y Z
  2. BX Y Z 3
  3. CX 3 ( Y Z 4 ) 3
  4. DX 2 Y 2 Z

Correct answer

C. X 3 ( Y Z 4 ) 3

Step-by-step solution

The sum of all oxidation values must be equal to zero. Let, number of atoms of X, Y and Z are respectively a, b and c. Then, ( + 3 ) a + ( + 5 ) b + ( - 2 ) c = 0 Or 3 a + 5 b - 2 c = 0 Now, putting values of a, b and c for all the given options, which will give sum equal to zero, will be our formula. (a) For, X 2 Y Z a = 2 b = 1 c = 1 Thus, 3 a + 5 b - 2 c = 0 3 × 2 + 5 - 2 ≠ 0 (b) For, X Y Z 3 a = 1 , b = 1 , c = 3 3 a + 5 b - 2 c = 0 3 + 5 - 6 ≠ 0 (c) X 3 ( Y Z 4 ) 3 a = 3 , b = 3 , c = 12 3 a + 5 b - 2 c = 0 (

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