A:- Except D. NaHSO4 remaining all compounds
produce a basic aqueous solution, bacause NaHSO4 is dissolved in
water to form strong acid and strong base,
Balanced equation,
NaHSO4Â Â +Â Â H2O -------> NaOH +
H2SO4
                                    Â
strong base strong acid
The remaining compounds, when dissolved in water to form strong
base and weak acid, so a basic aqueous solution is produced by
these compounds.
Balanced chemical equations,
NaF Â Â +Â Â Â Â H2OÂ Â
--------> HF + Â Â NaOH
                                Â
  weak acid     strong
base
Na3PO4 + 3 H2O --------> H3PO4Â Â +Â Â 3
NaOH
                                Â
  weak acid     strong
base
NaNO2Â Â + H2OÂ Â -----------> HNO2
+Â Â NaOH
                                Â
  weak acid     strong
base