Identify the conjugate base of $[Zn(H_2O)_4]^{2+}$ from the following:

Which of the following is a Lewis acid?

Ammonia is a Lewis base because it is

Which of the following is the strongest Lewis base?

According to the Brønsted-Lowry theory,an aqueous solution of $HNO_3$ will contain:

The first ionization constants ($pK_a$ values) for the following dicarboxylic acids are given:
Oxalic acid: $pK_1$
Malonic acid: $pK_2$
Heptanedioic acid: $pK_3$
Which of the following represents the incorrect order of their $pK_a$ values?