Ores and Metallurgy MCQ Questions & Answers in Inorganic Chemistry | Chemistry
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121.
In the extraction of chlorine by electrolysis of brine ________.
A
oxidation of $$C{l^ - }$$ ion to chlorine gas occurs
B
reduction of $$C{l^ - }$$ ion to chlorine gas occurs
C
for overall reaction $$\Delta {G^ \circ }$$ has negative value
D
a displacement reaction takes place
Answer :
oxidation of $$C{l^ - }$$ ion to chlorine gas occurs
No explanation is given for this question. Let's discuss the answer together.
122.
In the cyanide extraction process of silver from argentite ore, the oxidising and reducing agents used are
A
$${O_{2\,}}$$ and $$CO$$ respectively
B
$${O_{2\,}}$$ and $$Zn$$ dust respectively
C
$$HN{O_3}$$ and $$Zn$$ dust respectively
D
$$HN{O_3}$$ and $$CO$$ respectively
Answer :
$${O_{2\,}}$$ and $$Zn$$ dust respectively
123.
Which of the following are main requirements for vapour phase refining?
(i) Metal should form a volatile compound with the reagent.
(ii) The volatile compound should be easily decomposable to give back pure metal.
(iii) Metal should be very reactive and form a stable compound with the reagent.
A
(i), (ii) and (iii)
B
(i) and (ii)
C
(ii) and (iii)
D
(i) and (iii)
Answer :
(i) and (ii)
No explanation is given for this question. Let's discuss the answer together.
124.
Which one of the following ores is known as Malachite :
A
$$C{u_2}O$$
B
$$C{u_2}S$$
C
$$CuFe{S_2}$$
D
$$Cu{\left( {OH} \right)_2}.CuC{O_3}$$
Answer :
$$Cu{\left( {OH} \right)_2}.CuC{O_3}$$
Malachite is a copper carbonate hydroxide mineral with the formula $$Cu{\left( {OH} \right)_2}.CuC{O_3}.$$
125.
Select the correct statements.
(i) Based on reactivity series, occurrence of certain elements takes place in native state
(ii) Cresol and aniline are called froth stabilizers in froth floatation process
(iii) Due to basic nature of oxides alkali metal oxides can not be reduced by carbon
(iv) Sulphide ores of $$Cu,Ag,Zn$$ are concentrated by hydraulic washing
A
(i) and (ii)
B
(ii) and (iii)
C
(i) and (iv)
D
(iii) and (iv)
Answer :
(i) and (ii)
No explanation is given for this question. Let's discuss the answer together.
126.
In the extraction of copper from its sulphide ore, the metal finally obtained by the reduction of cuprous oxide with
A
iron (II) sulphide
B
carbon monoxide
C
copper (I) sulphide
D
sulphur dioxide
Answer :
iron (II) sulphide
Highly electropositive metals like $$Al, K, Na$$ etc. are extracted by the electrolytic reduction.
zone refining method is used for obtaining metals of high purity e.g. $$Ge$$
Froth flotation process is suitable for sulphide ores
Cyanide process is used for the extraction of gold.
127.
Sulphide ores of metals are usually concentrated by froth flotation process. Which one of the following sulphide ores offer an exception and is concentrated by chemical leaching ?
A
Galena
B
Copper pyrite
C
Sphalerite
D
Argentite
Answer :
Argentite
Leaching is the selective dissolution of the desired mineral leaving behind the impurities
in a suitable dissolving agent e.g.,
Argentitie or Silver glance, $$A{g_2}S$$ is an ore of silver. Silver is extracted from argentite by the mac-Arthur and Forest process ( leaching process ).
$$A{g_2}S + 4NaCN \to $$ $$2Na\left[ {Ag{{\left( {CN} \right)}_2}} \right] + N{a_2}S$$
$$4Au + 8KCN + 2{H_2}O + {O_2} \to $$ $$4K\left[ {Au{{\left( {CN} \right)}_2}} \right] + 4KOH$$
128.
Which of the following statement(s) is/are correct ?
(i) Cast iron is used in the manufacture of railway sleepers
(ii) Wrought iron is used in the manufacture of anchors, bolts, chains etc.
(iii) Nickel steel is used in making pendulums.
A
Only (i)
B
(i) and (ii)
C
(i), (ii) and (iii)
D
Only (iii)
Answer :
(i), (ii) and (iii)
All three statements are correct
129.
Which of the following ores cannot be concentrated by magnetic separation?
A
Haematite
B
Malachite
C
Magnetite
D
Siderite
Answer :
Malachite
Malachite is not a magnetic ore. It is $$CuC{O_3} \cdot Cu{\left( {OH} \right)_2}.$$
130.
In blast furnace iron oxide is reduced by
A
silica
B
carbon monoxide
C
carbon
D
lime stone
Answer :
carbon monoxide
In blast furnace, $$F{e_2}{O_3}$$ is reduced to $$Fe$$ by $$CO.$$
$$F{e_2}{O_3} + 3CO \to 2Fe + 3C{O_2} \uparrow $$