Which statement is correct?
1 )
Adding sodium oxide to water gives a lower pH solution than adding silicon oxide to water.
2 )
The oxidation state of sodium in its chloride is higher than the oxidation state of silicon in its chloride.
The atomic radius of sodium is larger than that of silicon.
4 )
The melting point of the chloride of sodium is lower than the melting point of the chloride of silicon.
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