Extraction and uses of metals

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Question 18

Manganese can be extracted from its ores, rhodochrosite ( $MnCO3\text{MnCO}_3$ ) and alabandite ( $MnS\text{MnS}$ ).

Rhodochrosite decomposes on heating to produce manganese(II) oxide ( $MnO\text{MnO}$ ). The manganese oxide is then reduced by carbon in a furnace:

\text{MnO} + \text{C} \rightarrow \text{Mn} + \text{CO}

Identify which species is reduced in this reaction, and explain your choice in terms of oxygen transfer.

[1]

When alabandite ( $MnS\text{MnS}$ ) is roasted in air, sulfur dioxide ( $SO2\text{SO}_2$ ) is produced as a waste gas. Write a chemical equation to show how sulfur dioxide reacts with water to form an acidic solution, and state one harmful effect of acid rain on the environment.

[2]

A mining company processes a sample of rhodochrosite containing $g575\text{ g}$ of $MnCO3\text{MnCO}_3$ . Calculate the maximum mass of manganese ( $Mn\text{Mn}$ ) that can be obtained from this sample. (Relative atomic masses: $Mn=55\text{Mn} = 55$ , $C=12\text{C} = 12$ , $O=16\text{O} = 16$ )

[4]

Manganese can be extracted from its ores, rhodochrosite ( $MnCO3\text{MnCO}_3$ ) and alabandite ( $MnS\text{MnS}$ ).

Rhodochrosite decomposes on heating to produce manganese(II) oxide ( $MnO\text{MnO}$ ). The manganese oxide is then reduced by carbon in a furnace:

\text{MnO} + \text{C} \rightarrow \text{Mn} + \text{CO}

Identify which species is reduced in this reaction, and explain your choice in terms of oxygen transfer.

[2]

[4]

Extraction and uses of metals

Question 18

Markscheme

Extraction and uses of metals

Question 18

Markscheme

Extraction and uses of metals

Question 18

Extraction and uses of metals Questions

Extraction and uses of metals

Question 18

Extraction and uses of metals Questions