Answer : The correct option is, (d) to agitate a solution
Stir bars is a type tool which is used in the chemical laboratory for mixing the solute in the solvent.
Stir bars is a magnet which is covered with such type of material that does not react with any liquid it is immersed in. Its cover is not react for any type of liquids.
The stir bar magnet is placed in a container or flask. The stir bar magnet made to spin with an external magnetic field.
The stir bar magnet is used in the laboratory to agitate a solution.
Hence, the correct option is, (d) to agitate a solution
There is only a net gain of only two ATP molecules in glycolysis of one six-carbon glucose because it uses the other two to split the glucose.
are there any answer choices?
Look at the picture.
So on picture two resonance structures are shown. You can see that nitrogen's electron pair is not used in aromatic system and is planar to the ring.