Extraction of Highly Reactive Metals

Q. A company finds smithsonite (ZnC$O_3$) in a digging area. Identify the final stage to extract the metal.

1. Reduction using coke
2. Refining of Zn
3. Roasting
4. Electrolytic reduction

Q. It is easier to extract least reactive metals like gold and platinum.

1. True
2. False

Q. Aluminium can be obtained by the electrolytic refining of aluminium oxide.

1. False
2. True

Q.

A metal which is highly reactive can't exist in the native state.

1. False

2. True

Q. Metals at the top of the reactivity series $K,Na,Ca$ are never found in nature as free elements.

1. True
2. False

Q. Based on activity series, which of the following elements can be extracted by the process of electrolysis?

1. Zinc
2. Gold
3. Calcium
4. Copper

Q. Which of these can be used to extract a metal from its oxide?

1. More reactive metal
2. Carbon
3. Oxidizing agent
4. Reducing agent

Q. The general process flow in metallurgy of zinc blende is:

1. Mining
2. Froth flotation
3. Roasting
4. Reduction
5. Refining

Q. Highly reactive metals like sodium and potassium are extracted from their ore by the process of:

1. roasting
2. reduction of metal oxide
3. electrolytic reduction
4. calcination

Q. Which of the following reactions are examples of calcination?

1. ${\mathrm{CaCO}}_3\left(s\right)\to \mathrm{CaO}\left(s\right)+{\mathrm{CO}}_2\left(g\right)$

2. $4{\mathrm{FeS}}_2\left(s\right)+11O_2\left(g\right)\to 2{\mathrm{Fe}}_2{O}_3\left(s\right)+8{\mathrm{SO}}_2\left(g\right)$

3. $$ 2\mathrm{Al}{\left(\mathrm{OH}\right)}_3\left(s\right)\to {\mathrm{Al}}_2{O}_3\left(s\right)+3H_{2}O\left(g\right)$\left(\right)$

4. $$ \mathrm{CuS}\left(s\right)+{\mathrm{CuSO}}_4\left(\mathrm{aq}\right)\to 2\mathrm{Cu}\left(s\right)+2{\mathrm{SO}}_2\left(g\right)$\left(\right)$