Which of the following compounds is used as a medicine?

The pair whose both species are used in antacid medicinal preparations is

Why should medicines not be taken without consulting doctors?

An organic compound that is commonly used for sanitizing surfaces is $.....$

Which of the following statements are correct?
$I$. Binding of inhibitor at allosteric site changes the shape of the active site.
$II$. Shape of the receptor does not change after attachment of chemical messenger to it.
$III$. $A$ chemical messenger gives message to the cell by entering it.
$IV$. Erythromycin is an example of bacteriostatic antibiotic.

Which of the following is not a general anesthetic?