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CBSE Class 12-science Answered

 1) which one of lPCl subscript 4 and PCl subscript 4 is not likely to exist ?

2) how does ammonia react with AgNstraight O subscript 3? Write it chemical reaction ?

3) give the disproportionation reaction of straight H subscript 3 PO subscript 3 

4) HYPOPHOSPHURUS acis is a good reducing agent . Justify with example 

5) give chemical equation in support of the statement that all bonds in PCl subscript 5 MOLECULE ARE NOT EQUIVALENT 

Asked by niharikapabba2605 | 04 Aug, 2018, 08:20: PM
Expert Answer
 
1) Which one among PCl4+ and PCl4- is not likely to exist?
Ans: PCl4+ exists more likely than PCl4-.
As we move down the group the stability of +5 oxidation state decreases and the stability of +3 oxidation state increases.
PCl4+ is more stable as it has +5 which is more stable.
 
2) AgNo subscript 3 space plus space straight H subscript 2 straight O space plus space 3 NH subscript 3 space rightwards arrow with blank on top space NH subscript 4 NO subscript 3 space plus space left square bracket Ag left parenthesis NH subscript 3 right parenthesis subscript 2 right square bracket OH
 
3)
  4 straight H subscript 3 PO subscript 3 space rightwards arrow with blank on top space 3 straight H subscript 3 PO subscript 4 space plus space PH subscript 3

Each space element space undergoes space oxidation space and space reduction space reaction colon
Oxidation space half space reaction colon
straight H subscript 3 PO subscript 3 space rightwards arrow with blank on top space straight H subscript 3 PO subscript 4

Reduction space half space rection colon
straight H subscript 3 PO subscript 3 space rightwards arrow with blank on top space PH subscript 3
 
 
4) In H3PO2, two hydrogen atoms are bonded directly to the phosphorous atom which imparts the reducing character to the acid.
 
5) PCl5 has trigonal pyramidal structure and the three equatorial P-Cl bonds re equivalent, while two axial bonds are different and longer then equatorial bonds.
On heating, PCl5 breaks down into phosphorous trichloride and chlorine gas, which shows that out of five P-Cl bonds three are equatorial and tightly bonded and two are axial which are weak bonds hence breaks.
PCl subscript 5 rightwards arrow with heat on top space PCl subscript 3 space plus space Cl subscript 2 space upwards arrow
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