A) Argon
B) Potassium
C) Phosphorus
D) Sulphur
Correct Answer: C
Solution :
\[{{P}_{4}}+5{{O}_{2}}\,\to \,2{{P}_{2}}{{O}_{5}}\] \[{{P}_{2}}{{O}_{5}}+3{{H}_{2}}O\to 2{{H}_{3}}P{{O}_{4}}\]
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