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

What is the use of the compound shown in the image?

Which one of the following is a non-narcotic analgesic?

Assertion $(A)$: Shape of the receptor changes after attachment of chemical messenger.
Reason $(R)$: Receptor does not regain original shape after removal of chemical messenger.
The correct answer is

Given below are two statements:
Statement $I:$ Aspirin and Paracetamol belong to the class of narcotic analgesics.
Statement $II:$ Morphine and Heroin are non-narcotic analgesics.
In the light of the above statements,choose the correct answer from the options given below.

Fill in the blanks:
$(i)$ ........ and ......... drugs are effective for the treatment of cancer.
$(ii)$ ............ is responsible for the depletion of ozone in the stratosphere.
$(iii)$ ......... is helpful for patients suffering from $AIDS$.
$(iv)$ The $SI$ unit of electric current is ...... .