An amphoteric anion is capable of both accepting and donating a proton in a suitable medium. Which of the following ions exhibits this property?

What is the enthalpy change in $kJ$ when $1$ gram-equivalent of a strong base reacts with an excess of a strong acid?

Which of the following oxides will not give $OH^{-}$ ions in aqueous solution?

Consider the following reaction involving two acids shown below: formic acid and $HF$.
$K^+F^- + HCOOH \rightleftharpoons HCOO^-K^+ + HF$
Given: $pK_a$ of $HCOOH = 3.8$ and $pK_a$ of $HF = 3.2$.
Which of the following statements about this reaction are true?
$(A)$ Formic acid is the strongest Bronsted acid in the reaction
$(B)$ $HF$ is the strongest Bronsted acid in the reaction
$(C)$ $KF$ is the strongest Bronsted base in the reaction
$(D)$ $KO_2CH$ is the strongest Bronsted base in the reaction
$(E)$ The equilibrium favours the reactants
$(F)$ The equilibrium favours the products
$(G)$ Formic acid has a weaker conjugate base
$(H)$ $HF$ has a weaker conjugate base

Which of the following can give $OH^{-}$ ions?

Which of the following is the strongest Lewis base?