A) phosphorus is both oxidised and reduced.
B) only phosphorus is reduced.
C) phosphorus is not oxidized
D) none of these
Correct Answer: A
Solution :
\[4P\,+3KOH\,+3{{H}_{2}}O\,\,\to K{{H}_{2}}P{{O}_{2}}+P{{H}_{3}}\] \[\operatorname{O}.N\,\,of\,\,P=0\] in \[K{{H}_{2}}P{{O}_{2}}\] it is +1, in \[P{{H}_{3}}\] it is -3. Hence P is oxidised and reduced.
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