The conjugate base of a strong acid is a

Lemon gives a sour taste because of

Arrange the following species in the decreasing order of their basic strength: $(a) OH^{-}, (b) NH_2^{-}, (c) F^{-}$.

The pair of compounds which cannot exist together in aqueous solution is:
$I.$ $NaH_2PO_4$ and $NaHCO_3$
$II.$ $Na_2CO_3$ and $NaHCO_3$
$III.$ $NaOH$ and $NaH_2PO_2$
$IV.$ $NaHCO_3$ and $NaOH$

Which acid is not an Arrhenius acid?

The dissociation constants $(K_a)$ of four acids are given below. Which of these is the strongest acid?