Quartz sand is an example of polymineralic rock while granite is an example of a monomineralic rock.

Which of the following statements about dynamite is not correct?

Smith’s test is used to find out ________

Pyrite is an oxide of iron.

Aston’s process is used to manufacture _____

Which of the following statements about electric precipitators is false?

Cordite is prepared from _______

Augite forms crystals of ____ shape.