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NTA Abhyas JEE Main2020Chemistryp Block Elements (Group 15, 16, 17 & 18)Practice

Select the most ionic and most covalent compounds respectively from the following: CrO 5 , Mn 2 O 7 , PbO, Fe 2 O 3 , SnO 2

Options

  1. AC r O 5 , M n 2 O 7
  2. BP b O , M n 2 O 7
  3. CCrO 5 , Fe 2 O 3
  4. DC r O 5 , S n O 2

Correct answer

B. P b O , M n 2 O 7

Step-by-step solution

As anion is same, the covalent character in ionic compound will depend upon the size and charge on the cation. According to fajan's rule, Covalent nature ∝ charge on cation PbO is most ionic as it has P b 2 + and M n 2 O 7 is most covalent as it has M n + 7 .

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