Which of the following statements is completely correct?
A) H2CO3 is a weak acid, and NaOH is a weak base (alkali).
B) H2CO3 is a strong acid, and NaOH is a strong base (alkali).
C) NH3 is a weak base (alkali), and H2CO3 is a strong acid.
D) NH3 is a weak base (alkali), and HCl is a strong acid.
E) NH3 is a strong base (alkali), and HCl is a weak acid.
Answer: D) NH3 is a weak base (alkali), and HCl is a strong acid.