Extracting Metals Low in Reactivity Series

Q.

Name a metal that reacts with steam, but the reaction is reversible.

Q.

Van Arkel method is used for refining copper metal.

1. True

2. False

Q. (a) Name the ore from which aluminium is extracted.
(b) How is ore purified (give equations also)?
(c) How is aluminium obtained from pure ore?
(d) Which method of refining is used to get 99.8% pure aluminium?

Q.

The metal which can be extracted simply by heating the cinnabar ore in the air is:
(a) Zn (b) Cu (c) Al (d) Hg

Q.

Carbon cannot reduce the oxides of sodium, magnesium, and aluminium of their respective metals. Why? Where are these metals placed in the reactivity series? How are these elements obtained from their ores? Take an example to explain the process of extraction along with chemical equations.

Q.

How are the less reactive metals (which are quite low in the reactivity series) extracted? Explain with the help of an example.

Q.

The oxides of which of the following metals can be reduced to metals by heating:

1. Hg

2. Al

3. Zn

4. Na

Q.

How will you bring out the reduction of the following metal oxide?

$\mathrm{ZnO}$, $\mathrm{HgO}$, ${\mathrm{Ag}}_2\mathrm{O}$ and ${\mathrm{MnO}}_2$

Q.

Describe with one example, how moderately reactive metals (which are quite low in the reactivity series) are extracted.

Q.

Name the metal which is extracted from the ore called 'Rock salt'
(b) Name two ores of zinc. Write the names of the chemical compounds present in them and give their chemical formulae.
(c) Explain how, mercury is extracted from its sulphide ore (cinnabar). Give equation of the reactions involved.
(d) In the electrolytic refining of a metal M, what would you tak eas anode, cathode and electrolyte?
(e) Name any five metals which are purified by electrolytic refining method.

Q.

Copper metal $\left(\mathrm{Cu}\right)$ can displace Iron $\left(\mathrm{Fe}\right)$ from the solution of Ferrous Sulphate $\left({\mathrm{FeSO}}_4\right)$.

1. True
2. False

Q.

A metal which exists as a liquid at room temperature is obtained by heating its sulphide ore in the presence of air.
(a) Name the meta and write its chemical symbol.
(b) Write the name and formula of the sulphide ore.
(c) Give the equations of chemical reactions involved in the production of metal from its sulphide ore.
(d) Name a common device in which this metal is used.
(e) Can this metal displace copper from copper sulphate solution? Why

Q. Statement I: Alkali metals dissolve in liquid ammonia to give blue solutions.
Statement II: Alkali metals in liquid ammonia give solvated species of the type $\left[M\right(N{H}_3{)}_n{]}^{\oplus }$ (M = alkali metals).
(IIT-JEE, 2007)

1. Statement I is true; Statement II is true; Statement II is the correct explanation for Statement I.
2. Statement I is true; Statement II is true; Statement II is not the correct explanation for Statement I.
3. Statement I is false; Statement II is true.
4. Statement I is true; Statement II is false.

Q. Name the following:
(i) Two metals which are found in the free or native state.
(ii) The mixture of materials fed into a furnace to extract a metal.
(iii) The rocky impurities present in an ore.
(iv) The substance added to get rid of gangue in the extraction of metal.
(v) The process of heating a substance very strongly in such a way that it does not combine with oxygen.
(vi) The process in which an ore is heated in air so that oxygen gets added to it to form the oxides.
(vii) Ore of iron referred to as "fool's gold".
(viii) The most abundant metal in the crust of the earth.
(ix) The chief ore of aluminium.
(x) The substance added along with alumina in the Hall-Heroult's process.
(xi) The materials used as electrodes in the electrolytic extraction of aluminium.
(xii) The kind of welding in which aluminium powder is used.
(xiii) The chief metal present in magnalium and duralumin.
(xiv) Two metals which occur in nature in free state as well as in combined state.
(xv) Name two metals which are always found in combined state.

Q. Question 47
A metal that exists as a liquid at room temperature is obtained by heating its sulphide in the presence of air. Identify the metal and its ore and give the reaction involved.

Q.

The oxides of which of the following metals can be reduced to metals by heating:

1. Al

2. Zn

3. Na

Q. Aluminium is extracted from its chief ore, bauxite. The ore is first purified and then the metal is extracted from it by electrolytic reduction.
(a) Write three balanced equations for the purification of bauxite by Hall's process.
(b) Name a chemical used for dissolving aluminium oxide. In which state of sub-division is the chemical used?
(c) Write an equation for the reaction which takes place at the anode during the extraction of aluminium by the electrolytic process.
(d) Mention one reason for the use of aluminium in thermite welding. Which particular property of cast iron makes it unsuitable for the construction of bridges?

Q.

Question 62
(i) Given below are the steps for extraction of copper from its ore. Write the reaction involved.
(a) Roasting of copper (I) sulphide.
(b) Reduction of copper (I) oxide with copper (I) sulphide.
(c) Electrolytic refining.

(ii) Draw a neat and well-labelled diagram for electrolytic refining of copper.

Q.

The metal which is reduced to the corresponding metal by using Carbon is:

1. Copper

2. Mercury

3. Zinc

4. Sodium

Q.

Name a metal which is found abundantly in the earths crust.

Q.

(b) (i) Metals are generally solid at room temperature. Name the metal which is liquid at room
temperature (say 25° C).
(ii) Which element is the most reactive element of Group 1(IA) elements?

Q. Zinc oxide can be reduced to metal by heating with carbon but $C{r}_2{O}_3$ cannot be reduced by heating with carbon, why?

Q. Why can platinum be cut with a knife?

Q.

Given below are the symbols of some elements:

Mg, K, Zn, H, Ag, Cu, Al, Fe Chose from the above A metal that does not directly combine with oxygen (even on heating) to form the metal oxide.

Q. What are the steps involved in extraction of moderately reactive metals from their sulphide ores?
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Q. When $C{u}_{2}S$ is heated in air, the products obtained are _______ .

1. $C{u}_{2}O$ and $CuO$
2. $C{u}_{2}O$, $S{O}_2$ and $Cu$
3. $C{u}_{2}O$, $S{O}_3$ and $Cu$
4. $CuO$, $S{O}_2$, and $Cu$

Q.

${\text{Fe}}_2{\text{O}}_3\text{(aq)}$ + $\text{2Al(s)}$ $\to$ $\text{2Fe(s)}$ + ${\text{Al}}_2{\text{O}}_3\text{(aq)}$

Which type of reaction is this?

1. Displacement
2. Decomposition
3. Combination
4. Neutralization

Q.

Explain why the carbon cannot reduce the oxides of Na or Mg?

Q. Name the following metals:
A metal present in cryolite other than sodium.

Q. Cinnabar is _______ .

1. $HgS$
2. $HgO.HgCl$
3. $HgCl$
4. $HgO$