Enzymes are sensitive to

Which of the following pairs of ions are colourless?

If $A, B$,and $C$ are three sets,then $A - (B \cup C)$ is equal to

The Thomson coefficient of a conductor is $10 \mu V/K$. The two ends of the conductor are maintained at $50^{\circ}C$ and $60^{\circ}C$,respectively. The amount of heat absorbed by the conductor when a charge of $10 C$ flows through it is:

Which is the most important cereal crop of temperate regions?

Fungal herbicides are produced by which of the following?