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The solubility of $K_2SO_4$ in water is 16g at $50^{\large \circ}C$.The minimum amount of water required to dissolve $4g\;K_2SO_4$ is

$(a)\;10g\qquad(b)\;25g\qquad(c)\;50g\qquad(d)\;75g$

Solubility in the amount of solute in g per 100g solvent.
Hence (b) is the correct answer.