Which of the given is used as an antacid

Which of the given is a strong base?

A strong acid:

Which one of the given is formed when sodium hydrogen carbonate reacts with hydrochloric acid?

Generally, when certain metals react with an acid they release _______ gas.

Most of the oxides of metals when react with acid, form____

Which one of the given is hydracid?

Acid present in apple is :

Which one of the given acids is used in the treatment of bone marrow and scurvy diseases?

Level of pH found in antacid solution