Matte — 98 % C u 2 S + 2 % F e S

Thomas slag — Raw material for cement industry

Chemistry - General Principles Processes Isolation Elements - Quiz-3

Poling process is used for:

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The removal of $C u_{2} O$ from Cu
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The removal of $A l_{2} O_{3}$ from Al
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The removal of $F e_{2} O_{3}$ from Fe
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All of these

AgCl on fusion with sodium carbonate, gives:

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$A g_{2} C O_{3}$
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$A g_{2} O$
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$A g$
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$A g_{2} C_{2}$

$X C l_{2} (e x c e s s) + Y C l_{2} \to X C l_{4} + Y ↓;$

$Y O \to_{> 400 °}^{∆} \frac{1}{2} O_{2} + Y,$

Ore of Y would be:

(a) Siderite

(b) Cinnabar

(d) Hornsilver

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Leaching of $A g_{2} S$ is carried out by heating it with a dilute solution of:

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NaCN only
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HCl
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NaOH
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NaCN in presence of $O_{2}$

Leaching is commercially carried out for in the concentration of:

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Galena
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Argentite
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Copper pyrites
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tin stone

NaCN is sometimes added in the froth flotation process as depressant when ZnS and PbS minerals are expected because:

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$P b {(C N)}_{2}$ is precipitated while no effect on ZnS
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ZnS forms soluble complex $N a_{2} [Z n {(C N)}_{4}]$ while PbS forms froth
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PbS forms soluble complex $N a_{2} [P b {(C N)}_{4}]$ while ZnS forms froth
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NaCN is never added in froth floatation process

Give the correct order of initials T or F for following statements. Use T if statement is true and F if it is false.

(i) In Gold schmidt thermite process aluminium acts as a reducing agent.

(ii) Mg is extracted by electrolysis of aq. solution of $M g C l_{2}$

(iii) Extraction of Pb is possible by carbon reduction method

(iv) Red Bauxite is purified by Serpeck's process

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TTTF
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TFFT
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FTTT
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TFTF

A substance that can act as collector in the froth floatation method is -

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Sodium xenate.
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Sodium pyrophosphate.
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Sodium nitroprusside.
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Sodium ethyl xanthate.

$F e C r_{2} O_{4}$ (chromite) is converted to Cr by following steps :

$C h r o m i t e \overset{I}{\to} N a C r O_{4} \overset{I I}{\to} C r_{2} O_{3} \overset{I I I}{\to} C r$

Reagents in I, II and III step might be:

I-Step II-Step III-Step

(a) $N a_{2} C o_{3} / a i r, ∆$ C C

(b)NaOH/air, $∆$ C, $∆$ Al, $∆$

(d)conc. $H_{2} S O_{4}, ∆$ $N H_{4} C l, ∆$ $C, ∆$

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The anode mud in the electrolytic refining of silver contains :

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Zn, Cu, Ag, Au
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Zn, Ag, Au
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Cu, Ag, Au
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Au only

Incorrect statement in the electrolysis of ${Al}_{2} O_{3}$ by Hall-Heroult process is:

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Cryolite ${Na}_{3} [{AlF}_{6}]$ lower the m.pt. of ${Al}_{2} O_{3}$ , and increase its electrical conductivity.
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Al is obtained at the cathode, and ${CO}_{2}$ at the anode.
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${Li}_{2} {CO}_{3}$ can be used in place of cryolite ( ${Na}_{3} {AIF}_{6}$ )
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${MgF}_{2}$ can be used in place of fluorspar $({CaF}_{2})$

Correct match is:

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Bayer's method $—$ $N a_{2} C O_{3}$
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Matte $—$ $98 % C u_{2} S + 2 % F e S$
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van Arkel method $—$ $A g I$
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Thomas slag $—$ Raw material for cement industry

In the purification of impure nickel by Mond's process, metal is purified by:

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Electrolytic reduction
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Vapour phase thermal decomposition
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Thermite reduction
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Carbon reduction

The reduction of an oxide by aluminium is called:

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Bayer's process
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Goldschmidt's aluminothermite process
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Hall's process
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van Arkel process

Match the column (I) and (II) and select the correct answer using the codes given below.

Column-I Column-II

(a) Argentite (1) Halide ore

(b) Cuprite (2) Carbonate ore

(d) Carnallite (4) Sulphide ore

Codes :

a b c d a b c d

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() 4 3 2 1
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() 1 2 3 4
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() 2 3 4 1
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() 3 4 1 2

Correct statement among the following is:

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In the decomposition of oxide into oxygen and gaseous metal, entropy increases.
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Decomposition of oxide is an endothermic change.
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To make $∆ G °$ negative, the temperature should be high enough so that $T ∆ S ° > ∆ H °$ .
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All of the above.

Which does not represent the correct method?

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() $T i C l_{2} + 2 M g \to T i + 2 M g C l_{2}$ : Kroll
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() $N i {(C O)}_{4} \to N i + 4 C O$ : Mond
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() $A g_{2} C O_{3} \to 2 A g c + C O_{2} + \frac{1}{2} O_{2}$ : Van Arkel
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() $Z r I_{4} \to Z r + 2 I_{2}$ : Van Arkel

Main source of lead is galena (PbS). It is converted to Pb by:

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(A) PbS →∆airPbO+SO2 ↪C Pb+CO2
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(B)&nsp; $PbS \to_{∆}^{air} PbO + Pbs ↪ Pb + {SO}_{2}$
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(A) A (B) B
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(C) both (D) none

For which of the following metals Bessemerisation process is important?

I : Fe, II : Cu, III : Al, IV : Silver :

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I, II
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II, III
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I, III
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all

The chemical processes in the production of steel from haematite ore involve:

(A) Reduction (B) Oxidation

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The chemical composition of "slag" formed during the smelting process in the extraction of copper is-

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${Cu}_{2} + FeS$
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FeSiO₃
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CuFeS
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${Cu}_{2} S + FeO$

Which of the following statement is incorrect about the extractive metallurgy of copper?

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Matte chiefly consists of cuprous sulfide and some ferrous sulphide.
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Most of the impurity of iron sulphide is removed as fusible slag during roasting.
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The copper pyrites is concentrated by froth floatation process.
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self reduction and electrolysis respectively.

Match column (I) with column (II) and select the correct answer using codes given below in the lists.

Column - I Column - II

(i) Cynide process (a) Extraction of Al

(ii) Self reduction (b) Extraction of Ag

(iii) Electrolytic reduction (c) Extraction of Cu

(iv) Carbon reduction (d) Extraction of Sn

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(i)-(b), (ii)-(c), (iii)-(a), (iv)-(d)
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(i)-(b), (ii)-(d), (iii)-(a), (iv)-(c)
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(i)-(d), (ii)-(a), (iii)-(c), (iv)-(b)
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(i)-(c), (ii)-(b), (iii)-(d), (iv)-(a)

Assertion : The reduction of a metal oxide is easier if the metal formed is in liquid state
at the temperature of reduction.

Reason : The value of entropy change +S of the reduction process is more on +ve side when the metal formed is in liquid state and the metal oxide being reduced is in solid state. Thus the value of $∆_{f} G^{°}$ becomes more on negative side.

If both the assertion and the reason are true and the reason is a correct explanation of the assertion
If both the assertion and reason are true but the reason is not a correct explanation of the assertion
If the assertion is true but the reason is false
If both the assertion and reason are false

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Assertion : Extraction of gold from its native ore involves leaching the metal with dilute
solution of NaCN in presence of air.

Reason : This is an oxidation reaction and leads to the formation of a soluble complex.

If both the assertion and the reason are true and the reason is a correct explanation of the assertion
If both the assertion and reason are true but the reason is not a correct explanation of the assertion
If the assertion is true but the reason is false
If both the assertion and reason are false

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Assertion : Silica is added as a flux in reverberatory furnace, in the extraction of copper from copper pyrites.

Reason : Silica decreases the melting point of the ore and remove the impurity of lead sulphide as $P b S i O_{3} .$

If both the assertion and the reason are true and the reason is a correct explanation of the assertion
If both the assertion and reason are true but the reason is not a correct explanation of the assertion
If the assertion is true but the reason is false
If both the assertion and reason are false

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Assertion : Cast iron is different from pig iron.

Reason : Cast iron is made by melting pig iron with scrap iron and coke using hot air blast and has about 3% carbon content.

If both the assertion and the reason are true and the reason is a correct explanation of the assertion
If both the assertion and reason are true but the reason is not a correct explanation of the assertion
If the assertion is true but the reason is false
If both the assertion and reason are false

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Assertion : In the Hoop’s process of aluminium purification, the fused materials remain in three different layers. These layers remain intact even in electrolytic reduction.

Reason : This is an oxidation reaction and leads to the formation of a soluble complex.

If both the assertion and the reason are true and the reason is a correct explanation of the assertion
If both the assertion and reason are true but the reason is not a correct explanation of the assertion
If the assertion is true but the reason is false
If both the assertion and reason are false

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A mixture of Mn²⁺ & Zn²⁺ can be separated by using an excess of

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NH₄OH
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NaOH
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H₂SO₄
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HNO₃

Considering Ellingham diagram, which of the following metals can be used to reduce alumina?

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Fe.
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Zn
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Mg
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Cu

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Practice Chemistry Quiz Questions and Answers

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Practice Chemistry Quiz Questions and Answers

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