Which pair of components is used in the preparation of medicinal antacids?

Which of the following statements is not true?

The use of chemicals for the treatment of diseases is called:

Which category of the synthetic detergents is used in toothpaste?

Consider the following structure. For codeine,$R$ stands for:

Given below are two statements:
Statement $I:$ Noradrenaline is a neurotransmitter.
Statement $II:$ Low level of noradrenaline is not the cause of depression in human.
In the light of the above statements,choose the correct answer from the options given below.