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Q.

A solution of sodium sulfate contains \(92 \text {g of } \mathrm{Na}^{+}\) ions per kilogram of water. The molality of \(\mathrm{Na}^{+}\) ions in that solution in mol  \(kg^{-1}\) is :

(a) 16

(b) 8

(c) 4

(d) 12