Roasting is
A) forming metal parts using heat and small crystals of metal.
B) the process of heating an ore to drive off volatile compounds.
C) selectively dissolving a metal in strong acid to separate it from its ore.
D) heating an ore, in the presence of helium or another substance, in order to purify the ore and obtain the liquid metal.
E) heating an ore, in the presence of oxygen or another substance, in order to cause a chemical reaction that drives off newly formed volatile compounds.
Correct Answer:
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Q29: An interstitial alloy contains carbon in one-fourth
Q30: Calcination is
A) heating an ore, in the
Q31: Which of the following is NOT generally
Q32: Chromate,CrO4-,has a(n)_ shape.
A) octahedral
B) trigonal bipyramidal
C) trigonal
Q33: Which of the following is an example
Q35: Pyrometallurgy is the
A) refining of metal ores
Q36: Identify the ferromagnetic elements.
A) cobalt
B) iron
C) nickel
D)
Q37: Which of the following is an example
Q38: Which of the following is an example
Q39: Smelting is
A) heating an ore, in the
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