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JEE Main202116 Mar 2021Morning ShiftChemistryp Block Elements (Group 15, 16, 17 & 18)Actual

Match List-I with List-II List-I List-II Name of oxo acid Oxidation state of ' P (a) Hypophosphorous acid (i) + 5 (b) Orthophosphoric acid (ii) + 4 (c) Hypophosphoric acid (iii) + 3 (d) Orthophosphorous acid (iv) + 2 (v) + 1 Choose the correct answer from the options given below :

Options

  1. A( a ) - ( v ) ,   ( b ) - ( i ) ,   ( c ) - ( ii ) ,   ( d ) - ( iii )
  2. B( a ) - ( iv ) ,   ( b ) - ( i ) ,   ( c ) - ( ii ) ,   ( d ) - ( iii )
  3. C( a ) - ( iv ) ,   ( b ) - ( v ) ,   ( c ) - ( ii ) ,   ( d ) - ( iii )
  4. D( a ) - ( v ) ,   ( b ) - ( iv ) ,   ( c ) - ( ii ) ,   ( d ) - ( iii )

Correct answer

A. ( a ) - ( v ) ,   ( b ) - ( i ) ,   ( c ) - ( ii ) ,   ( d ) - ( iii )

Step-by-step solution

(a) Hypophosphorus acid : H 3 P O 2 + 1 3 + x + - 2   2 = 0 x = + 1 (b) Orthophosphoric acid : H 3 P O 4 + 1 3 + x + - 2 4 = 0 x = + 5 (c) Hypophosphoric acid : H 4 P 2 O 6 + 1 4 + 2 x + - 2 6 = 0 x = + 4 (d) Orthophosphorous acid : H 3 P O 3 + 1 3 + x + - 2 3 = 0 x = + 3

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