Match the column I with column II and mark the appropriate choice. Column I Column II (A) Van Arkel (i) $$Ni$$ (B) Zone refining (ii) $$Ti$$ (C) Mond process (iii) $$Ag$$ (D) Cupellation (iv) $$Ge$$

(A) $$\rightarrow$$(ii), (B)$$\rightarrow$$(iv), (C)$$\rightarrow$$(i), (D) $$\rightarrow$$ (iii)

(A) $$\rightarrow$$(i), (B)$$\rightarrow$$(ii), (C)$$\rightarrow$$(iii), (D) $$\rightarrow$$ (iv)

(A) $$\rightarrow$$(iii), (B)$$\rightarrow$$(i), (C)$$\rightarrow$$(ii), (D) $$\rightarrow$$ (iv)

(A) $$\rightarrow$$(iv), (B)$$\rightarrow$$(iii), (C)$$\rightarrow$$(i), (D) $$\rightarrow$$ (ii)

Match the refining methods (Column I) with metals (Column II). Column I (Refining methods) Column II (Metals) (I) Liquation (a) Zr (II) Zone Refining (b) Ni (III) Mond Process (c) Sn (IV) Van Arkel Method (d) Ga

(I) - (c); (II) - (d); (III) - (b); (IV) - (a)

(I) - (b); (II) - (c); (III) - (d); (IV) - (a)

(I) - (b); (II) - (d); (III) - (a); (IV) - (c)

(I) - (c); (II) - (a); (III) - (b); (IV) - (d)

Match the following: (i) Biodegradable polymer (p) 3-Hydroxybutanoic acid (ii) Bakelite (q) Phenol (iii) Neoprene (r) 2-chlorobuta-1, 3-diene (iv) Glyptal (s) phthalic acid

$$i - p, ii - q, iii - r, iv - s$$

$$i - q, ii - p, iii - r, iv - s$$

$$i - p, ii - q, iii - s, iv - r$$

$$i - s, ii - r, iii - p, iv - q$$

MCQ Questions for Class 12 Engineering Chemistry General Principles And Processes Of Isolation Of Elements Quiz 8

Ellingham diagram represents change of:

0%
$\Delta G$ with temperature
0%
$\Delta H$ with temperature
0%
$\Delta G$ with pressure
0%
( $\Delta G-T\Delta S$ ) with temperature

Explanation

Ellingham Diagram is diagrams which help us in predicting the feasibility of thermal reduction of ore.

Ellingham diagram normally consists of plots of

$\Delta G$ vs

$T$ for the formation of oxides of common metals and reducing agents i.e., for the reaction shown below,

$2xM{(s)}+O_2(g) \rightarrow 2M_xO$

Hence, options A is the correct answer.

Which of the following statements is correct?
(i) Copper is extracted by hydrometallurgy from low-grade ores.
(ii) In the electrolytic reduction of alumina, graphite is acting as an anode and steel vessel with the lining of carbon acts as an anode.
(iii) In Hall-Heroult process, aluminium is obtained at anode and CO and

$CO_2$ are produced at the cathode.

0%
(i) only
0%
(i) and (ii) only
0%
(ii) and (iii) only
0%
All of these

Explanation

$(i)$ Copper is extracted by hydrometallurgy from low-grade ores. It is leached out using acid or bacteria. The solution containing

$Cu^{2+}$ is treated with scrap iron or

$H_2$ .

$Cu^{2+} (aq)+H_2 (g)\longrightarrow Cu (s)+2H^+ (aq)$

$(ii)$ In the electrolytic reduction of alumina. The graphite act as anode and steel with a lining of carbon acts as an anode.

$(iii)$ The process of extracting Aluminium from Alumina

$(Al_2O_3)$ by electrolysis is called Hall-Heroult process. In this process Aluminium is produced at cathode which is obtained by outlet, oxygen is released at an anode. It reacts with carbon of anode producing

$CO$ and

$CO_2$ .

Which of the following is used as a method of purification for silicon?

0%
Electrolytic refining
0%
Liquation
0%
Zone refining
0%
Distillation

Four metals and their methods of refinement are given
(i)

$Ni,\ Cu,\ Zr,\ Ga$
(ii) Electrolysis, van Arkel process, zone refining, Mond's process
Choose the right method for each:

0%
$Ni:$ Electrolysis, $Cu:$ van Arkel process, $Zr:$ Zone refining, $Ga:$ Mond's process
0%
$Ni:$ Mond's process, $Cu:$ Electrolysis, $Zn:$ van Arkel process, $Ga:$ Zone refining
0%
$Ni:$ Mond's process, $Cu:$ van Arkel process, $Zr:$ Zone refining, $Ga:$ Electrolysis
0%
$Ni:$ Electrolysis, $Cu:$ Zone refining, $Zr:$ van Arkel process, $Ga:$ Mond's process

Explanation

$Ni$ is refined by Mond's process.

$Cu$ is refined by Electrolysis.

$Zn$ is refined by Van Arkel process.

$Ga$ is refined by Zone refining.

In this method, a low melting metal like tin can be made to flow on a sloping surface. In this way it is separated from higher melting impurities. The method is known as:

0%
distillation
0%
vapour phase refining
0%
liquation
0%
zone refining

A number of elements are available in earth's crust but most abundant elements are _______.

0%
$Al$ and $Fe$
0%
$Fe$ and $Cu$
0%
$Cu$ and $Ag$
0%
none of these

Match the column I with column II and mark the appropriate choice.

	Column I		Column II
(A)	Van Arkel	(i)	$Ni$
(B)	Zone refining	(ii)	$Ti$
(C)	Mond process	(iii)	$Ag$
(D)	Cupellation	(iv)	$Ge$

0%
(A) $\rightarrow$ (i), (B) $\rightarrow$ (ii), (C) $\rightarrow$ (iii), (D) $\rightarrow$ (iv)
0%
(A) $\rightarrow$ (iii), (B) $\rightarrow$ (i), (C) $\rightarrow$ (ii), (D) $\rightarrow$ (iv)
0%
(A) $\rightarrow$ (ii), (B) $\rightarrow$ (iv), (C) $\rightarrow$ (i), (D) $\rightarrow$ (iii)
0%
(A) $\rightarrow$ (iv), (B) $\rightarrow$ (iii), (C) $\rightarrow$ (i), (D) $\rightarrow$ (ii)

Explanation

Van Arkel process for refining

$Zr, Ti$ .

Zone refining for semiconductor like

$Ge$ .

Mond process for refining

$Ni$ .

Cupellation for refining noble metals like

$Ag, Au$ .

Zone refining is based on the principle that________.

0%
impurities of low boiling metals can be separated by distillation
0%
impurities are more soluble in molten metal than in solid metal
0%
different component of a mixture are differently adsorbed on an adsorbent
0%
vapours of volatile compound can be decomposed in pure metal

Explanation

Zone refining is based on the difference in solubility of impurities in molten and solid state of the metal. Semi conductors like

$Si,Ge$ and

$Ga$ are purified by this method.

The method of zone refining of metals is based on the principle of:

0%
greater mobility of pure metal than that of impurity.
0%
higher melting point of the impurity than that of pure metal
0%
all above are correct
0%
greater solubility of the impurity in the molten state than in the solid.

Explanation

Zone refining is based on the difference in solubility of impurities in molten and solid state of the metal. Semiconductor like

$Si,Ge$ and

$Ga$ are purified by this method.

Identify the oxide ore among the following :

0%
Copper pyrites
0%
Copper glance
0%
Siderite
0%
Limonite

Explanation

Formula of Limonite is

$F_eO(OH)\cdot nH_2O$ . It is an oxide ore.

In case of Hall's process applied on reduction of

$Al_2O_3$ to Al can be done by using:

0%
Cathode - Al, Anode - Graphite
0%
Cathode - Graphite, Anode - Graphite
0%
Cathode - Graphite, Anode - Steel
0%
Cathode - Steel, Anode - Graphite

What is the main composition of matte?

0%
$CuS$
0%
$CuO$
0%
$Cu_{2}S$
0%
$Cu_{2}O$

Explanation

Copper matte is a combination of copper sulphide and a small amount of iron sulphide. In the process of copper extraction matte is the stage subsequent to the final reduction process which involves converting it to crude copper.

The composition of copper in copper matte is:

Copper sulphide

$Cu_2S$ ,

$80-95$ %

The method of zone refining of metals is based on the principal of:

0%
Greater mobility of the pure metal than that of the impurity
0%
Higher melting point of the impurity than that of the pure metal
0%
Greater noble character of the solid metal than that of the impurity
0%
Greater solubility of the impurity in the molten state than in the solid

Explanation

Zone refining is based on the difference in solubility of impurities in molten and solid-state of the metal. Semi-conductor like

$Si, Ge$ and

$Ga$ are purified by this method.

Hence, the correct option is

$D$

Which of the following compound is used as froth stabliser?

0%
Fatty acid
0%
Aniline
0%
Xanthates
0%
Phosphoric acid

The mass of carbon anode consumed (giving of carbon dioxide) in the production of

$270 \ kg$ aluminium metal bum bauxite by Hall process is: (Atomic mass

$Al = 27$ )

0%
$180$ kg
0%
$270$ kg
0%
$540$ kg
0%
$90$ kg

Explanation

The chemical reaction for the Hall process is given by

$2Al_2O_3+3C\rightarrow 4Al+3CO_2$

Moles of aluminium produced

$=\dfrac{270000}{27}=10000$

According to the reaction,

$10000 \; kg$ moles of aluminium can be produced by consuming

$2500\times3=7500 \ moles$ of Carbon

Hence mass of carbon=

$12\times 7500=90000\ g=90\ kg$

Therefore, D is the correct answer

Froth flotation process is based upon :

0%
Magnetic property of gangue
0%
Specific gravity of ore particle
0%
Preferential wetting of ore particle by oil
0%
Preferential wetting of gangue particle by oil

Which of the following statements is correct wrt the following graph?

0%
Below 1623 K, Mg reduces $Al_2O_3$
0%
Above 1623 K, Al reduces MgO
0%
Both (a) and (b) are correct
0%
Both (a) and (b) are wrong

Aluminothermy used for the spot welding of large iron structure is based on the fact that-

0%
reaction between iron and oxygen is endothermic
0%
as compared to to Al, Fe has greater affinity for oxygen
0%
as compared to iron, Al has great affinity for oxygen
0%
reaction between Al and oxygen is endothermic

The process of carrying out the reduction of metal oxides by heating with coke is termed as :

0%
Roasting
0%
Smelting
0%
Zone refining
0%
Ore dressing

Which of the following is colour blue ?

0%
$CuF_2$
0%
$CuF$
0%
$ZnF_2$
0%
$ZnCl_2$

Explanation

Colour of

$CuF_2$ = White crystalline hygroscopic solid.

Colour of

$CuF$ =White crystalline

Colour of

$ZnF2$ =white

Colour of

$ZnCl2$ =colourless or white. Copper hydroxide have blue colour

The electrolytes usually used in the electroplating of gold and silver, respectively are:

0%
$[Au(OH)_4]^- and [Ag(OH)_2]^-$
0%
$[Au(CN)_2]^- and [Ag(cl_2]^-$
0%
$[Au(NH)_3)_2]^+ and [Ag(CN)_2]^-$
0%
$[Au(CN)_2]^- and [Ag(CN)_2]^-$

Explanation

The Anode is a bar of silver metal, and the electrolyte (the liquid in between the electrodes) is a solution of Silver cyanide, ${[Ag{({CN})}_{2}]}^{-}$ , in water.

Gold plating is done in much the same way, using a gold anode and an electrolyte containing Gold cyanide, ${[Au{({CN})}_{2}]}^{-}$ .

Option D is correct

Identify

$x,\ y \ and \ z$ for the following metallurgical process :

$Metal\ sulphide\overset { x }{ \rightarrow } Metal\ oxide\overset { y }{ \rightarrow } Impure\ metal$

$x,\ y$ and

$z$ are respectively :

0%
roasting, smelting, electrolysis
0%
roasting, calcination, smelting
0%
calcination, auto-reduction, basemerisation
0%
None of the above

Explanation

Roasting

$\rightarrow$ It is a process in metallurgy

in which sulphide are is heated in

air and transforms into oxides.

Smelting

$\rightarrow$ It is a process of extracting

a base metal from corresponding

metal oxides.

electrolysis

$\rightarrow$ It is used in metallurgical

process, such as in extraction or purification

of metals from ores or compounds.

Therefore, the correct option is A.

Which of the following is NOT calcination?

0%
$Fe(OH)_3.xH_2O\rightarrow Fe_2O_3+H_2O$
0%
$CuCO_3.Cu(OH)_2\rightarrow^ 2CuO+CO_2+H_2O$
0%
$CaCO_3\rightarrow^ CaO+CO_2$
0%
$(NH_4)_2CO_3\rightarrow^ 2NH_3+CO_2+H_2O$

Explanation

Calcination is a process of heating to high temperature in air or oxygen, however calcination is also used to mean a thermal treatment process in the absence or limited supply of air or oxygen.

$(NH_4)_2CO_3$ is not an ore.so, it do not undergo calcination.

Which compound is used to separate two metal sulphide in forth flotation process :

0%
$Na_2CO_3$
0%
KCI
0%
NaCN
0%
$(SCN)_2$

The combined state of metals are called:

0%
Mineral
0%
Gangue
0%
Flux
0%
Native form

Explanation

The metal found in nature occur in the free or combined state it is generally known as pure metals. A native metal is a metal found in metallic state naturally. It can be in the pure form or in the form of an alloy.

$Mineral:$ Minerals are substances that are formed naturally in the earth. Minerals are usually solid, inorganic, have a crystal structure, and are formed naturally by geological process.

$Gangue:$ It is sand, rock and other impurities surrounding the minerals of interest in an ore. It is the combined state of the metal.

$Flux:$ It is a chemical cleaning, flowing or purifying agent. It is the substance added to the molten metals to bond with impurities that can be removed.

$Native form:$ Native element, any number of chemical elements that may occur in nature uncombined with other elements.

Hence, the correct option is B.

The above process is:

$HgS\xrightarrow{O_2}HgS.HgO$

$\downarrow\Delta$

$Hg$

0%
auto oxidation
0%
self reduction
0%
thermal reduction
0%
none of the above

Explanation

Cinnabar (

$HgS$ ), when heated with a current of

$O_2$ gets reduced to

$Hg$ without the need of any additional reducing agent. The process involved is known as self reduction

Tetrabromoethane on treatment with Zn gives :

0%
ethyl bromide
0%
ethane
0%
ethene
0%
ethyne

All of the following statements are true about Ellingham diagram, except:

0%
the graph for the formation of $CO_2$ from $CO$ and $O_2$ is a straight line with upward slope.
0%
the graph for the formation of $CO$ from carbon and oxygen is straight line almost parallel to temperature axis.
0%
the graph for the formation of $ZnO$ shows sudden change with positive slope.
0%
the graph for the formation of $Ag_2O$ is at upper part.

In the Hall-Heroult process, aluminium is formed at the cathode. The cathode is made out of:

0%
platinum
0%
carbon
0%
pure aluminium
0%
copper

Explanation

The hall-heroult process is used for smelting of aluminium.

In the Hall-Heroult process, the cathode is made of carbon. Also, here anode is also made up of carbon.

Hence, the correct option is

$\text{B}$

1142287_1331596_ans_a0b35c1c1b734149bd7210e32b6372ae.jpg

The bodies of aircraft are often made using aluminium.
Which two properties of aluminium make it suitable for this use?

0%
property 1 - good conductor of electricity ; property 2- good conductor of heat
0%
property 1 - good conductor of electricity ; property 2- strong
0%
property 1 - good conductor of heat ; property 2- low density
0%
property 1 - strong ; property 2 - low density

Explanation

$\text{It is more important that metal used in aircraft is strong enough and lighter too hence aluminium is used rather than iron in aircraft.}$

Distillation under reduced pressure is used to purify liquids which:

0%
are highly volatile
0%
have high boiling points
0%
are explosives
0%
decomposes below their boiling points

In simple distillation of liquids, it involves simultaneously.

0%
Vaporisation and condensation
0%
Heating and sublimation
0%
Vaporisation and sublimation
0%
Boiling and filtration

Match the refining methods (Column I) with metals (Column II).

	Column I (Refining methods)		Column II (Metals)
(I)	Liquation	(a)	Zr
(II)	Zone Refining	(b)	Ni
(III)	Mond Process	(c)	Sn
(IV)	Van Arkel Method	(d)	Ga

0%
(I) - (b); (II) - (c); (III) - (d); (IV) - (a)
0%
(I) - (b); (II) - (d); (III) - (a); (IV) - (c)
0%
(I) - (c); (II) - (a); (III) - (b); (IV) - (d)
0%
(I) - (c); (II) - (d); (III) - (b); (IV) - (a)

Match the following:

(i)	Biodegradable polymer	(p)	3-Hydroxybutanoic acid
(ii)	Bakelite	(q)	Phenol
(iii)	Neoprene	(r)	2-chlorobuta-1, 3-diene
(iv)	Glyptal	(s)	phthalic acid

0%
$i - p, ii - q, iii - r, iv - s$
0%
$i - q, ii - p, iii - r, iv - s$
0%
$i - p, ii - q, iii - s, iv - r$
0%
$i - s, ii - r, iii - p, iv - q$

Explanation

(i) PHBV (3-Hydroxybutanoic acid + 4-Hydroxypentanoic acid) is a biodegradable polymer.

(ii) Bakelite is synthesized from the monomer Phenol & Formaldehyde

(iii) 2-chlorobuta-1,3-diene is the monomer of Neoprene.

(iv) Glyptal is synthesized from the condensation polymerization of Phthalic acid & Ethylene glycol.

Hence, the correct option is

$\text{A}$

A copper coin was electroplated with Zn and then heated at high temperature until there is a change in colour. What will be the resulting colour ?

0%
White
0%
Black
0%
Silver
0%
Golden

Explanation

Copper coin when electroplated with

$Zn$ and then heated to high temperature, it forms brass.

Brass have golden colour.

Which represent incorrect matching of metals with their ores?

0%
Mg - Chloride
Na - Chloride
Cu - Sulphide
Al - Silicate
0%
Mg - Carbonate
Na - Chloride
Cu - Sulphide
Al - Oxide
0%
Mg - Carbonate
Na - Carbonate
Cu - Oxide
Al - Phosphate
0%
Mg - Oxide,
Na - Chloride
Cu - Sulphide
Al - Oxide.

Which of the following term is not related to Al extraction?

0%
Serpek's process
0%
Hall-Heroult process
0%
Thermite process
0%
Hoop's process

Explanation

Hoop process: A molten alloy of copper, crude aluminium and silicon is used as the anode. It forms the lowermost layer in the cell.

Hall-Heroult process: This is the major industrial process of smelting aluminium.

Serperk process: The powdered bauxite is mixed with carbon and heated up to

$1800^oC$ and a current of nitrogen is passed, aluminum nitride is obtained. Silica is converted in to silicon (Si).

Aluminium is used as a reducing agent in thermite process.

Find the correct match:

0%
Azurite : $CuCO_3. 2Cu(OH)_2$
0%
Malachite : $Cu(OH)_2. CuCO_3$
0%
Anglesite : $PbSO_4$
0%
Chalcocite : $Cu_2S$

Explanation

Azurite is a copper carbonate hydroxide mineral with a chemical composition of

$Cu_3(CO_3)_2(OH)_2$ .

The function of fractionating column is:

0%
to separate the two components
0%
to provide greater, cooling surface to the vapours
0%
to kept the vapour pressure constant
0%
to avoid mixing of the vapours of two components

Froth flotation process is used for the

0%
Oxide ores
0%
Sulphide ores
0%
Chloride ores
0%
All of these

The ore that is concentrated by froth flotation process is:

0%
Cinnabar
0%
Bauxite
0%
Malachite
0%
Zincite

Which of the following ores is/are sulphide ore(s)?

0%
Galena
0%
Cinnabar
0%
Tinstone
0%
Copper pyrites

Explanation

Explanation: The sulphide minerals are compounds of the metals with sulphur. Some ot the examples are:

Galena- ore of lead Formula is

$PbS$

Cinnabar-ore of mercury Formula is

$HgS$

Copper pyrites-ore of copper. formula is

$CuFeS_2$

Hence option A,B,D are correct.

Select the correct statements for Ellingham diagram:

0%
The slope of the curves of the formation of metal oxide is +ve because $\Delta G^0$ becomes less negative or increases with the rise in temperature.
0%
Each curve is a straight line except when some change takes place in phase ( $s\rightarrow l \ or \ l \rightarrow g$ )
0%
Each curve is not a straight line except when some change takes place in phase ( $s \rightarrow l \ or \ l \rightarrow g$ )
0%
The slope of the curves of the formation of metal oxide is -ve because $\Delta G^0$ becomes less negative or increases with the rise in temperature.

For the reaction of FeO at the temperature corresponding to point D, which of the following statement is correct?

0%
$\Delta G$ value for overall reduction reaction with carbon monoxide is zero.
0%
$\Delta G$ value for overall reduction reaction with a mixture of 1 mol of carbon and 1 mol of oxygen is positive
0%
$\Delta G$ value for overall reduction reaction with a mixture of 2 mol of carbon and 1 mol of oxygen is positive
0%
$\Delta G$ value for overall reduction reaction with carbon monoxide is negative

Which of the following statements is correct about the role of substances added in the froth floatation process?

0%
Collectors enhance the non-wettability of the mineral particles.
0%
Collectors enhance the wettability of gangue particles.
0%
By using depressants in the process, two sulphide ores can be separated.
0%
Froth stabilizers decrease the wettability of gangue.

Explanation

Froth floatation method is used for the concentration of sulphide ores. The process is based on the preferential wetting properties with the frothing agent and water.

Sodium ethyl xanthate (collector) is added to enhance the non-wettability of sulphide ore particles, and depressants are used to prevent certain types of particles from forming froth with the bubbles.

In the concentration of galena ore, sodium cyanide is added as a depressant for zinc sulphide

$(ZnS)$ .

$NaCN$ forms a layer of zinc complex and deposits on the surface of

$ZnS$ which prevents it from the formation of froth while

$PbS$ forms a froth. Thus, by using depressants, two sulphide ores can be separated.

Hence, the correct statements are given in options (A) and (C).

Which of the following statements are correct?

0%
A depressant prevents certain type of particle to come to the froth
0%
Copper matte contains $Cu_2S$ and $ZnS$
0%
The solidified copper obtained from reverberatory furnace has blistered appearance due to evolution of $SO_2$ during the extraction
0%
Zinc can be extracted by self-reduction

Explanation

Froth floatation method is used for the concentration of sulphide ores. Depressants are used to prevent certain type of particles from forming the froth with the bubbles.

In the concentration of galena ore, sodium cyanide is added as a depressant for zinc sulphide

$(ZnS)$ .

$NaCN$ forms a layer of zinc complex and deposits on the surface of

$ZnS$ while prevents it for the formation of froth while

$PbS$ forms a froth. Thus, by using depressants two sulphide ores can be separated.

The solidified copper obtained from reverberatory furnace has blistered appearance due to evolution of

$SO_2$ during the extraction. Therefore, it is called blistered copper.

Zinc is extracted first by roasting and then by reduction with carbon.

Copper matte contains copper sulfide and iron sulfide.

Hence, the correct options are (A) and (C).

In the froth floatation process, zinc sulphide and lead sulphide can be separated by ____.

0%
Using collectors
0%
Adjusting the proportion of oil to water
0%
Using depressant
0%
Using froth stabilizers

Explanation

Froth floatation method is used for the concentration of sulphide ores. The process is based on the preferential wetting properties with the frothing agent and water.

In the concentration of galena ore

$(PbS)$ , sodium cyanide is added as a depressant for zinc sulphide

$(ZnS)$ .

$NaCN$ forms a layer of zinc complex and deposits on the surface of

$ZnS$ while prevents it for the formation of froth while

$PbS$ forms a froth. Thus, by using depressants two sulphide ores can be separated.

Therefore,

$ZnS$ and

$PbS$ can be separated by using depressant and adjusting the proportion of oil to water.

Hence, the correct options are (B) and (C).

Which of the following ores are concentrated by froth floatation?

0%
Haematite
0%
Galena
0%
Copper pyrites
0%
Magnetite

Explanation

Froth floatation is a physical method of separating minerals from the gangue. This method is used for concentration of sulphide ores. The method is based on the preferential wetting properties with the frothing agent and water.

This method is used to concentrate ores such as Zinc blende

$(ZnS)$ , galena

$(PbS)$ and copper pyrites

$(CuFeS_2)$ .

Hence, the correct options are (B) and (C).

Pyrolusite is a/an :

0%
oxide ore
0%
sulphide ore
0%
carbide ore
0%
not an ore

Explanation

Pyrolusite is an oxide ore of manganese. It is the most common manganese mineral with chemical formula

$MnO_{2}$ .

Hence, option (A) is correct.

Cassiterite is an ore of :

0%
$Mn$
0%
$Ni$
0%
$Sb$
0%
$Sn$

Explanation

Cassiterite is a tin oxide mineral,

$SnO_{2}$ . It is the world's primary ore of tin. It is colourless when pure, but brown or black when iron impurities are present.

Hence, the correct option is (D).

CBSE Questions for Class 12 Engineering Chemistry General Principles And Processes Of Isolation Of Elements Quiz 8 - MCQExams.com

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Practice Class 12 Engineering Chemistry Quiz Questions and Answers

CBSE Questions for Class 12 Engineering Chemistry General Principles And Processes Of Isolation Of Elements Quiz 8 - MCQExams.com

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Practice Class 12 Engineering Chemistry Quiz Questions and Answers

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