Occurrence and Extraction of Metals

Question 1

What are the disadvantages of using electrolysis in extracting metals

Answer 1

Electrolysis is an expensive process because a large amount of energy is needed to melt the oxides or chlorides into molten form, and a large amount of electricity is needed to decompose the compounds.

Question 2

What is the colour of anhydrous CuSO₄(s) and Hydrated CuSO₄(s)

Answer 2

anhydrous CuSO₄(s) : white
Hydrated CuSO₄(s)

Question 3

What is the extraction reaction equation of K ?

Answer 3

2KCl (l) –> 2K (l) + Cl2(s)

Question 4

What is the extraction reaction equation of Na ?

Answer 4

2NaCl (l) –> 2Na (l) + Cl2 (g)

Question 5

What is the extraction reaction equation of Ca ?

Answer 5

CaCl2 (l) –> Ca (l) + Cl2(g)

Question 6

What is the extraction reaction equation of Mg ?

Answer 6

MgCl2 (l) –> Mg (l) + Cl2(g)

Question 7

What is the extraction reaction equation of Al ?

Answer 7

2Al2O3 (l) –> 4Al (l) +3O2 (g)

Question 8

What is the extraction reaction equation of Zn ?

Answer 8

2ZnO (s) +C(s) –> 2Zn (s) + CO2 (g)

Question 9

What is the extraction reaction equation of Fe ?

Answer 9

2Fe2O3 (s) + 3C (s) –> 4Fe (s) + 3CO2 (g)

Question 10

What is the extraction reaction equation of Fe ?

Answer 10

2Fe2O3 (s) + 3C (s) –> 4Fe (s) + 3CO2 (g)

Question 11

What is the extraction reaction equation of Sn ?

Answer 11

2SnO (s) + C (s) –> 2Sn (s) + CO2 (g)

Question 12

What is the extraction reaction equation of Pb ?

Answer 12

2PbO (s) + C (s) –> 2Pb (s) + CO2 (g)

Question 13

What is the extraction reaction equation of Cu ?

Answer 13

2CuO (s) + C (s) –> 2Cu (s) + CO2 (g)

Question 14

What is the extraction reaction equation of Hg ?

Answer 14

2HgO (s) –> 2Hg (l) + O2 (g)

Question 15

What is the extraction reaction equation of Ag ?

Answer 15

2Ag2O (s) –> 4Ag (s) + O2 (g)