Given scientific fact as input, generate the question from this fact such that it can be answered from the input.

You call a substance that is not an acid or a base neutral.
What do you call a substance that is not an acid or a base?

A 50 ml graduated cylinder of the following tools would give the most precise measurement of 15 milliliters of water.
Which of the following tools would give the most precise measurement of 15 milliliters of water?

Iron sulfide iron and sulfur are mixed together in a certain ratio and heated, what do they become.

When iron and sulfur are mixed together in a certain ratio and heated, what do they become?