To which class of dyes does Malachite green belong?

To which class of dyes does phenolphtalien belong?

To which class of drugs does salvarsan belong and for what disease it is used?

Based on theraupatic action, to which class of drug does ranitidine belong to?

The diagram alongside shows a lever in use : To which class of levers does it belong ?

The diagram below shows a lever in use : To which class of levers does it belong ?

What is salvarsan? To which class of drugs does it belong and for which disease is it used?

The diagram alongside shows a claw hammer used to remove a nail : To which class of lever does it belong?