Extracting Metals in the Middle of Reactivity Series

Q.

Name a reducing agent that may be used to obtain manganese from manganese dioxide.

Q. The composition of the thermite mixture by mass is

1. Iron (III) oxide and aluminum powder in the ratio $1:3$
2. Aluminum powder and iron (III) oxide in the ratio $1:3$
3. Aluminum powder and barium peroxide in the ratio of $1:3$
4. Barium peroxide and aluminum powder in the ratio of $1:3$

Q.

What chemical process is used for obtaining a metal form its oxide?

Q.

How is manganese extracted from manganese dioxide, $Mn{O}_2$? Explain with the help of an equation.

Q.

What is alpha black phosphorus?

Q.

Give Reason: Carbonate and Sulphide Ores are usually converted into oxides during the process of Extraction.

Q.

Hydrogen reacts with metal oxides to give the corresponding metals.

1. True
2. False

Q.

Name one metal each which is extracted by:
(a) reduction with carbon. (b) electrolytic reduction.
(c) reduction with aluminium (d) reduction with heat alone.

Q.

Some metallic oxides can be reduced by hydrogen, carbon and carbon monoxide and some cannot.Explain.

Q.

Calcination is 'Heating of ore to high temperatures in limited supply of air or oxygen

1. False

2. True

Q.

A black metal oxide $X{O}_2$ is used as a catalyst in the preparation of oxygen gas from potassium chlorate. The oxide $X{O}_2$ is also used in ordinary dry cells. The metal oxide $X{O}_2$ cannot be reduced satisfactorily with carbon to form meteal X.
(a) Name the metal X.
(b) Name the metal oxide $X{O}_2$
(c) Which reducing agent can be used to reduce $X{O}_2$ to obtain metal X?
(d) Name another metal which can also be extracted by the reduction of its oxide with the above reducing agent.

Q.

Which of the following Phosphorus is the most reactive?

1. Red Phosphorus

2. White Phosphorus

3. Violet Phosphorus

4. Scarlet Phosphorus

Q. What are the properties of amorphous silicon?

1. It is a brown powder
2. It is a good conductor of electricity at low temperature.
3. More reactive than crystalline silicon
4. When heated in air, it oxidises at surface level and catches fire

Q.

In the extraction of metallic zinc from zinc oxide, the reducing agent used is __.

Q.

(a) Name two metal s which occur in nature in free state as well as in combined state
(b) Name one ore of manganese. Which compound of manganese is present in this ore? Also write its chemical formula.
(c) A zinc ore on heating in air forms sulphur dioxide. Describe briefly any two stages involved in the conversion of this concentrated ore into zinc metal.

Q.

(a) Which metal is extracted from bauxite ore?
(b) Give the name of one ore of iron. Which iron compound is present in this ore? Write its chemical formula.
(c) Describe the extraction of zinc metal from its sulphide ore (zinc blende). Write an equation of the reactions involved.
(d) Explain why, the galvanised iron article is protected against rusting even if the zinc layer is broken.
(e) Name a common metal which is highly resistant to corrosion.

Q.

(a) For the reduction of a metal oxide, suggest a reducing agent other than carbon.
(b) Explain why an aqueous solution of sodium chloride is not used for the electrolytic extraction of sodium metal.

Q.

In the redox reaction

$\mathrm{Fe}\left(\mathrm{s}\right)+{\mathrm{Cu}}^{2+}\left(\mathrm{aq}\right)\to \mathrm{Cu}\left(\mathrm{s}\right)+{\mathrm{Fe}}^{2+}$

Which one of Cu and Fe is more reactive?

Q. Complete and balance the following equations:
(i) Al + O₂ $\stackrel{}{\to }$
(ii) Al + N₂ $\stackrel{}{\to }$
(iii) Al + KOH + H₂O $\stackrel{}{\to }$
(iv) Fe₂O₃ + ______ $\stackrel{}{\to }$ Al₂O₃ + _______.
(v) Fe₂O₃ + CO $\stackrel{}{\to }$

Q. The common name of the Goldschmidt Aluminothermic Reduction process is:

1. Smelting
2. Amalgamation
3. Thermite Process
4. Corrosion

Q. Which of the following metal is reacted with iron oxide in thermite process?

1. $\text{Cu}$
2. $\text{Co}$
3. $\text{Al}$
4. $\text{Na}$

Q.

Magnese metal is extracted from manganese dioxide by a reduction process by making use of :
(a) carbon (b) hydrogen (c) electrolysis (d) aluminium

Q.

Give the reason for the following:
Carbonate and sulphide ores are usually converted into oxides during the process of extraction of metals.

Q. Which of the following elements is preferred to be stored in kerosene oil?

1. Iron
2. Sodium
3. Silver
4. Carbon

Q. Which of the following options can be used as a reducing agent in smelting?

1. Carbon
2. Coke
3. Carbon monoxide
4. All of the above.

Q.

The ore from which aluminum is extracted must first be treated with so that pure aluminum oxides can be obtained.

Q.

From which of the following ores, metals cannot be extracted using calcination process?

1. ${\mathrm{CaCO}}_3$

2. ${\mathrm{Al}}_2{O}_3.2H_{2}O$

3. ${\mathrm{CaCO}}_3.\mathrm{Ca}(\mathrm{OH}{)}_2$

4. $\mathrm{ZnS}$

Q. When manganese dioxide is heated with aluminium powder, the products obtained are:

1. Mn, $A{l}_2{O}_3$ and heat
2. MnO and $A{l}_2{O}_3$
3. MnO, $A{l}_2{O}_3$ and heat
4. Mn, and $A{l}_2{O}_3$

Q.

Write the chemical equation for the following reactions:

• Reaction of iron with steam

Q.

Question 60
Give the steps involved in the extraction of metals of low and medium reactivity from their respective sulphide ores.