The P Block Elements - Result Question 7

####7. Strong reducing behaviour of H3PO2 is due to [2015 RS]

(a) presence of one −OH group and two P−H bonds

(b) high electron gain enthalpy of phosphorus

(c) high oxidation state of phosphorus

(d) presence oftwo-OH groups and one P−H bond.

Show Answer

Solution:

  1. (a) The acids which contain P−H bond have strong reducing properties.

H3PO2 acid is good reducing agent as it contains two P-H bonds and reduces, for example, AgNO3 to metallic silver.

4AgNO3+2H2O+H3PO2⟶4Ag+4HNO3+H3PO4

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