question_answer

The equivalent weight of \[{{H}_{3}}P{{O}_{2}}\], when it disproportionates into \[P{{H}_{3}}\] and \[{{H}_{3}}P{{O}_{3}}\] is

A) \[82\]       

B)                        \[61.5\]

C)        \[41\]                   

D)        \[20.5\]

Correct Answer: B

Solution :

The reaction can be written as Molecular weight of \[{{H}_{3}}P{{O}_{2}}\] \[=3+31+48=82\] Equivalent weight \[=\frac{82}{4}+\frac{82}{2}=61.5\]