Which is the purest form of iron?

Common house hold glass (i.e., soda-lime glass) is a/an ________ material?

Which of the following is a primary fuel?

Which of the following categories of gasoline has the highest lead susceptibility?

Mechanism of moisture removal in case of freeze drying of food stuff is by ________?

Furnace atmosphere for softening temperature determination of refractories (in which Seger Cones are placed) should be ________?