Which of the following is a soap?

How are transparent soaps manufactured?

Identify the use of the given drug.

Which one of the following will improve the lathering property of soap?

Which of the following statements are not correct?
$a$) Antihistamine also functions as an antacid
$b$) The shape of an active site of an enzyme does not change when the drug binds to an allosteric site
$c$) Chemical messengers communicate the message between two neurons
$d$) Potassium soaps are hard,while sodium soaps are soft to skin
The correct answer is

$A$ neutral fertilizer among the following compounds is