What are the most abundant minerals in the earth\'s crust? nitrates and phosphat

Question

What are the most abundant minerals in the earth's crust?

nitrates and phosphates

Which metal usually occurs as a sulfide in nature?

Which metal is matched correctly with the reduction process used to obtain the metal from its mineral form?

oxides and sulfides aluminosilicates and silicates chlorides and iodides

nitrates and phosphates

Which metal usually occurs as a sulfide in nature?

Cs Cr Ca Cd

Which metal is matched correctly with the reduction process used to obtain the metal from its mineral form?

Hg : electrolysis of mercury(II) chloride Li : electrolysis of molten lithium chloride Pt : roasting of platinum(IV) oxide Zn : none needed, occurs free in nature

Explanation / Answer

1. Aluminosilicates (i.e. Feldspar, about 40-60%) and silicates (i.e. quartz, about 30-50%)

2. Cadmium (electronegative transition metals), combines with sulfur, a less electronegative nonmetal, to form compounds with more covalent character.

Correct answer is Cd as CdS.

3. Lithium (Li) metal obtained by electrolysis of molten lithium chloride.

Anode reaction: 2 Cl- - 2 e- --> Cl2
Cathode reaction 2Li+ + 2e- --> 2Li

Overall reaction 2 LiCl --> 2 Li + Cl2

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