METAL AND NON-METAL

CLASS WORKSHEET-4 SIKANDAR

GURJAR
X Topic – Metallurgy (PGT CHMEISTRY)
Tutorial –VI Last Date

S.No Questions YEAR

Metallurgy, Minerals and Ores
01. Define the following terms:
(i) Mineral (ii) Ore (iii) Gangue
02. Name two metals which are found in nature in the free state.
03. Why are metals not generally found in their free state ? 2010
Enrichment of Ores
01.
Extraction of Metal – Low in Activity series
01. A metal that exist as a liquid at room temperature is obtained by heating its
sulphide ore in presence of air. Identify the metal and its ore and give the
reaction involved.
02. a) Name two metals which are obtained from their ores by simple 2019
heating.
b) Differentiate between Calcination and roasting, taking examples of
Zinc ores.
c) What is thermit reaction ? State its significane.
03. Name the ore of mercury. With the help of balanced chemical equations 2019
explain the process of extraction of mercury from its ore.
04. What happens when :
a) ZnCO3 is heated in the absence of oxygen ?
b) A mixture of Cu2O and Cu2S is heated.
05. Give the steps involved in the extraction of metals of low and medium
reactivity from their respective sulphide ores.
06. (i) Given below are the steps for extraction of copper from its ore. 2019
Write the Chemical equations of the reaction involved in each
case. .
(a) Roasting of copper(I) sulphide ore.
(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.

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07. (a) Copper reacts with a moist gas ‘A’ in the air and slowly loses its 2023
shiny brown surface. It turns green. Identify ‘A’ and the substance of
the green coating formed on the surface of copper.
(b) How is copper obtained from its sulphide ore ? Write the chemical
equations for the reaction involved in the extraction.
08. Name an ore of mercury and state the form in which Mercury is present in 2023
it.
09. Describe briefly the method to obtain mercury from cinnabar. Write the 2023
chemical equation for the reactions involved in the process.

10. State giving reason the reduction process to obtain the following metals 2024
from their compounds :
(i) Mercury
(ii) Copper and
(iii) Sodium
11. Name the ore of mercury and state the form in which it is found in nature. 2024
Write the chemical equation along with the condition required for the
reactions involved in the extraction of mercury from its ore.
12. Write balanced chemical equations to explain what happens when : 2020
(i) Mercuric oxide is heated
(ii) Mixture of Cuprous oxide and cuprous sulphide is heated.
(iii) Aluminium is reacted with manganese dioxide.
(iv) Ferric oxide is reduced with aluminium.
(v) Zinc Carbonate undergoes calcinations.
13. Write chemical equations for the following reactions : 2019
(i) Calcium metal reacts with water.
(ii) Cinnabar is heated in the presence of air.
(iii) Manganese dioxide is heated with aluminium powder.
14. a) How will you show experimentally that metals are good conductors 2019
of heat ?
b) Describe the extraction of Mercury metal from its ore Cinnabar(HgS).
15. In an activity, Aishu was given two substances; Copper Sulphide (Cu2S) and 2025
Copper Oxide(Cu2O) to obtain copper from these compounds. She was able SP
to extract copper successfully . Illustrate with the help of chemical equations
how Aishu might have completed the activity.
16. A metal M found in nature as sulphide ore (M2S) is one of the good 2011
conductor of heat and electricity and is used in making electrical wires :
i) Identify the metal M

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 ii) Write the balanced chemical equation involved in the process of
extraction of metal.
iii) Draw a labelled diagram for the electrolytic refining of the metal.
Extraction of Metal – Middle of the Activity series
01. What chemical process is used for obtaining a metal from its oxide ?
02. Give reasons : Carbonates and sulphide ores are usually converted into
oxides during the process of extraction.
03. Why should the metal sulphides and carbonates be converted to metal
oxides in the process of extraction of metal ?
04. Give the reaction involved during extraction of Zinc from its ore by
(a) Roasting of zinc ore
(b) Calcinations of zinc ore
05. Two ores A and B were taken. On heating ore A gives CO2 whereas ore B
gives SO2. What steps will you take to convert them into metal ?
06. With the help of suitable chemical equations, list the two main differences 2023
between roasting and calcination. How is metal reduced from the product
obtained after roasting/calcinations of the ore ? Write the chemical equation
for the reaction involved ?
07. With the help of chemical equations differentiate between roasting and 2024
calcinations. How is metal reduced from the product obtained after
roasting/calcinations of the ore ? Write the chemical equation for the
reaction involved.
08. What happens to zinc carbonate when it is heated strongly in a limited 2023
supply of air ?
09. Differentiate between roasting and calcinations giving chemical equation for 2023
each.
10. a) Where is iron placed in the reacrtivity series of metals ? Write the 2023
form/forms in which its ores are found in nature.
b) Differentiate between roasting and calcinations.
c) Expalin any two methods that are employed to prevent
rusting/corrosion of iron.
d) Why is aluminium used to join railway tracks or cracked machines
parts of ‘iron’ ? Write a balanced chemical equation for the reaction
which occurs.
11. (i) Write the name of two metals of moderate reactivity. Which one 2024
of the two is more reactive ? How can this fact be demonstrated
experimentally in a school laboratory ?
(ii) Some metals of moderate reactivity are also found in the Earth’s
crust in the form of their carbonates. Name the process involved in

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 the extraction of metal from them, giving chemical equation for
the reaction that occurs.
12. Two ores X and Y were taken. On heating these ores it was observed that 2020
a) Ore X gives CO2 gas and,
b) Ore Y gives SO2 gas.
Write steps to convert these ores into metals, giving chemical equation of
the reactions that take place.
13. Give reason : 2019
(a) Carbonate and sulphide ores are usually converted into oxides during
the process of extraction.
(b) Aluminium is a highly reactive metal, still it is widely used in making
cooking utensils.
14. An ore on treatment with dilute hydrochloric acid produces brisk 2019
effervescences. Name the type of ore with one example. What steps will be
required to obtain metal from the enriched ore ? Also, write the chemical
equations for the reactions involved in the process.
15. a) Write the steps involved in the extraction of pure metals in the middle 2018
of the acitivity series from their carbonate ores ?
b) How is Copper extracted from its sulphide ore ? Explain the various
steps supported by chemical equations. Draw labelled diagram for the
electrolytic refining of copper.
16. Metal X is found in nature as its sulphide XS. It is used in the galvanisation 2020
of iron articles. Identify the metal X. How will you convert this sulphide ore SP
into the metal ? Explain with equation.
17. a) What is reactivity series ? How does the reactivity series of metals
help in predicting the relative activities of various metals ?
b) Suggest different chemical processes used for obtaining a metal from
its oxides for metals in the middle of the reactivity series and metals
towards the top of the reactivity series. Support your answer with one
example each.
18. Name a metal of medium reactivity and write three main steps in the 2019
extraction of this metal from its sulphide ore.
19. An ore on treatment with dilute hydrochloric acid produces brisk 2014
effervescence. Which type of ore is this ?
20. Write balanced chemical equation for the reaction taking place when 2010
a) Zinc carbonate is calcinated
b) Zinc sulphide is roasted or heated in air
c) Zinc oxide is reduced to zinc.
Thermite reaction

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01. Compound X and almunium are used to join railway tracks.
(a) Identify the compound X.
(b) Name the reaction
(c) Write down its reaction.
02. A metal X, which is used in thermit process, when heated with oxygen gives 2019
an oxide Y which is amphoteric in nature. Identify X and Y. Write balanced
chemical equations of the reactions of oxide Y with hydrochloric acid and
sodium sulphate.
03. The following reaction takes place when aluminium powder is heated with
MnO2
3 MnO2 (s) + 4 Al(s) → 3 Mn(l) + 2 Al2O3(l) + Heat
(a) Is aluminium getting reduced ?
(b) Is MnO2 getting oxidised ?
04. The reaction of a metal A with Fe2O3 is highly exothermic and is used to 2023
join railway tracks.
(I) Identify the metal A and name the reaction taking place.
(II) Write the chemical equation for the reaction of metal A with
Fe2O3.
05. Name the chemical reaction that occurs between iron(III) oxide and 2024
aluminium metal. Write its balanced chemical equation. Why is this reaction
called displacement reaction ? Give one use of this reaction.
06. a) What is thermit process ? Where is this process used ? Write balanced 2020
chemical equation for the reaction involved.
b) Where does the metal aluminium, used in the process, occurs in the
reactivity series of metals ?
c) Name the substances that are getting oxidised and reduced in the
process.
07. Give reasons for the following : 2019
(i) Most metals conduct electricity well.
(ii) The reaction of Iron(III) oxide [Fe2O3] with heated aluminium is
used to join cracked machine parts.
08. The reaction of metal ‘X’ with Fe2O3 is highly exothermic and is used to 2016
join railway tracks. Identify the metal ‘X’. Write chemical equation for the
reaction.
09. The oxide X2O3 is unaffected by water. Name a method by which metal X 2015
can be obtained form its ore. Give one reason as to why have you have
chosen this method.
10. How is aluminium used to join railway track ? Explain the process by 2014
chemical equation.

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 11. a) Write the balanced chemical equation for the chemical reaction 2010
between manganese dioxide and aluminium powder. What happens if
manganese powder is heated with aluminium oxide ?
Extraction of Metal – Top of the activity series
01. Explain the following :
a) Carbon cannot reduce the oxide of Na or Mg.
b) Metals like Na, K, Ca and Mg are never found in their free state in
nature.
02. An element A burns with golden flame in air. It reacts with another element
B, atomic number 17 to give a product C. An aqueous solution of product C
on electrolysis gives a compound D and liberates hydrogen. Identify A, B, C
and D. Also write down the equation for the reaction involved.
03. We cannot use carbon to obtain sodium from sodium oxide. Why ? 2023
State the reaction taking place at cathode and anode during electrolytic
reduction of sodium chloride.
04. a) Name the process of reduction used for a metal that gives vigorous 2023
reaction with air and water both.
b) Carbon cannot be used as a reducing agent to obtain aluminium from
its oxide.
05. A metal exists in the nature in the form of common salt. Name the metal. 2024
Give reason why this metal cannot be obtained from its compound by
heating with carbon. Name the method by which it is obtained from its
compound.
06. a) “Carbon cannot be used to reduce metal oxides of sodium, 2024
magnesium , Calcium and aluminium to respective metals.
b) These metals are obtained by electrolytic reduction of their molten
chloride. Write the reactions that occur at the anode and cathode
during the electrolytic reduction of molten sodium chloride.
c) Illustrate with the help of a chemical equation reduction of manganese
dioxide with aluminium powder.
07. Carbon cannot reduce the oxides of sodium, magnesium and aluminium to 2020
their respective metals. Why ? Wherein the reactivity series these metals are
placed ? How are these metals obtained from their ores ? Take an example
to explain the process of extraction along with chemical equation.
08. How is the method of extraction of metals high up in the reactivity series 2020
different from that for metals in the middle ? Why cannot the same process 2019
be applied for them ? Name and explain the process of extraction of sodium.
Refining of Metal

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01. In the electrolytic refining of metal M, what would you take as the anode,
the cathode and the electrolyte ?
02. During extraction of metal, electrolytic refining is used to obtain pure
metals.
(a) Which material will be used as anode and cathode for refining of
silver metal by this process ?
(b) Suggest a suitable electrolyte also.
(c) In this electrolyte cell, where do we get pure silver after passing
electric current ?
03. (i) What is the cathode and anode made of in the refining of copper 2024
by this process ?
(ii) Name the solution used in the above process and write its formula.
(iii) How copper gets refined when electric current is passed in the
electrolytic cell ?
(iv) You have two beakers ‘A’ and ‘B’ containing copper sulphate
solution. What would you observe after 2 hours if you dip a strip
of Zinc in beaker ‘A’ and a strip of silver in beaker ‘B’ ? Give
reason for you observations in each case.
04. Draw a labelled diagram to show electrolytic refining of copper. State what 2024
happens when electric current is passed through the electrolyte taken in this
case.
05. (a) With the help of a diagram explain the method of refining of copper 2020
by electrolysis.
(b) How are broken railway tracks joined ? Give the name of the process
and the chemical equation of the reaction involved.
06. Name and explain the most widely used method for refining impure metals. 2024
07. A reddish brown metal ‘X’ when heated in air, gives a black compound ‘Y’, 2024
which when heated in presence of H2 gas gives ‘X’ back. ‘X’ is refined by SP
the process of electrolysis; this refined form of ‘X’ is used in electrical
wiring.
Identfy ‘X’ and ‘Y’. Draw a well-labelled diagram to represent the process
of refining ‘X’.
08. Draw a labelled diagram of electrolytic refining of copper. 2020
09. Explain with the help of a diagram, how copper metal can be refined. Label 2011
the important arrangement in the experimental set up. 2010