Which of the following is an example of herbicide?

Which one of the following is used in the manufacture of soaps?

Which one of the following living organisms gives litmus?

Which one of the following substances is used in the preservation of food stuff?

A student studies that a soap molecule has two ends, one of which is an ionic end and the other is carbon chain. Which of the following option explains the interaction of soap molecule with oil?

The breath test conducted by police to check drunken driver has which one of the following on the filter paper?