A) Covalent character
B) Melting point
C) pH when mixed with water
D) Solubility in aqueous alkali
Correct Answer: C
Solution :
\[N{{a}_{2}}O\] is a basic oxide and reacts with water to give \[NaOH\] so that its pH is higher than both \[Si{{O}_{2}}\] and \[{{P}_{4}}{{O}_{10}}\]. Both \[Si{{O}_{2}}\] and \[{{P}_{4}}{{O}_{10}}\] are acidic oxides but \[Si{{O}_{2}}\] is insoluble while \[{{P}_{4}}{{O}_{10}}\] reacts with water to give \[{{H}_{3}}P{{O}_{4}}\]. Thus, for \[{{P}_{4}}{{O}_{10}}\], pH when mixed with water is lower than that of \[Si{{O}_{2}}\].
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