( i ) Zr + 2 I 2 → 870 K Zr I 4 → 2075 K Zr + 2 I 2 ( ii ) Ni + 4 CO → 330 K Ni ( CO ) 4 → 450 K Ni + 4 CO ( pure ) The respective (ii) and (i) processes are :

Mond's process; Van Arkel process

Van Arkel process; Mond's process

Goldschmidt process; Mond's process

Mond's process; Goldschmidt process

Consider the following metallurgical process Sulphide → ∆ oxide → ∆ impure metal → ∆ pure metal The various processes A, B, and C respectively

Roasting, smelting, and electrolysis

Calcination, smelting, and electrolysis

Calcination, auto reduction, and bassemetisation

Roasting, aluminothermic reduction, electrolysis

ln the process of extraction of silver : silver ore + CN - + H 2 O → O 2 [ X ] + OH - [X] + Zn → [Y] + Ag [X], and [Y] in the above mentioned reaction is:

X= [Ag(CN) 2 ] - ; Y = [Zn(CN) 4 ] -2

X= [Ag(CN) 2 ] -3 '; Y=[Zn(CN) 4 ] -2

X= [Ag(CN) 2 ] - ;Y=[Zn(CN) 6 ] -

X=[Ag(CN) 4 ] - ;Y= [Zn(CN) 4 ] - 2

Chemistry - General Principles Processes Isolation Elements - Quiz-4

"Metals are usually not found as nitrates in their ores". Out of the following two (I and II)

reasons which is/are true for the above observation?

I . Metal nitrates are highly unstable.

II. Metal nitrates are highly soluble in water.

0%

I and II are true
0%
I and II are false
0%
I is false but II is true
0%
I is true but II is false

Roasting of sulphides gives the gas X as a by-product. This is a colorless gas with choking smell of burnt sulphur and caused great damage to respiratory organs as a result of acid rain. Its aqueous solution is acidic, acts as a oxidizing agent and its acid has never been isolated. The gas X is:

0%

SO₂
0%

CO₂
0%

SO₃
0%

H₂S

Which one of the following is a mineral of iron?

0%

Malachite
0%

Cassiterite
0%

Pyrolusite
0%

Magnetite

An interstitial compound among the following is -

0%

Bronze
0%

Invar
0%

Steel
0%

Bell metal

Which of the following elements is present as the impurity to the maximum extent in the pig Iron?

0%

Carbon
0%

Silicon
0%

Phosphorus
0%

Manganese

Sulphide ores of metals are usually concentrated by froth flotation process. Which one of the following sulphide ores offers an exception and is concentrated by chemical leaching?

0%

Argentite
0%

Galena
0%

Copper pyrite
0%

Sphalerite

Which one is malachite from the following?

0%

${CuCO}_{3} . Cu {(OH)}_{2}$
0%

${CuFeS}_{2}$
0%

$Cu {(OH)}_{2}$
0%

${Fe}_{3} O_{4}$

Extraction of metal from the ore cassiterite involves

0%

Carbon reduction of an oxide ore
0%

Self-reduction of a sulphide ore
0%

Removal of copper impurity
0%

Removal of iron impurity

Iron is removed from chalcopyrite as :

1. FeO

2. FeS

$3 . {Fe}_{2} O_{3} 4 . {FeSiO}_{3}$

0%
1
0%
2
0%
3
0%
4

$(i) Zr + 2 I_{2} \overset{870 K}{\to} Zr I_{4} \overset{2075 K}{\to} Zr + 2 I_{2} (ii) Ni + 4 CO \overset{330 K}{\to} Ni {(CO)}_{4} \overset{450 K}{\to} Ni + 4 CO (pure)$

The respective (ii) and (i) processes are :

0%

Mond's process; Van Arkel process
0%

Van Arkel process; Mond's process
0%

Goldschmidt process; Mond's process
0%

Mond's process; Goldschmidt process

The metal that can be purified by Zone refining is-

0%

Ni
0%

Zr
0%

In
0%

Fe

Identify the incorrect statement

0%

The scientific and technological process used for isolation of the metal from its ore is known as metallurgy
0%

Minerals are naturally occurring chemical substances in the earth's crust
0%

Ores are minerals that may contain a metal
0%

Gangue is an ore contaminated with undesired materials

The basic principle of froth floatation is :

0%

Impurities and metal ore have different wetting properties.
0%

Impurities and metal ore have different solubility.
0%

Impurities and metal ore have different diversity.
0%

Impurities and metal ore have different compressing power.

Identify incorrect match -

0%

$Kaolinite - {Al}_{2} {(OH)}_{4} {Si}_{2} O_{5}$
0%

$Cuprite - {Cu}_{2} O$
0%

$Siderite - {FeCO}_{3}$
0%

$Calamine - {ZnSO}_{4}$

Which among the following is not an oxide ore?

0%

Malachite
0%

Cuprite
0%

Zincite
0%

Bauxite

Mg in the Kroll process acts as

0%

Reducing agent
0%

Oxidizing agent
0%

Oxidizing agent at low temperature
0%

Reducing agent at low temperature

The process of converting hydrated alumina into anhydrous alumina is called

0%

Roasting
0%

Smelting
0%

Dressing
0%

Calcination

Identify the metal M, which has the following extraction principle.

$MS + O_{2} \overset{}{\to} MO +SO2 MO + MS \overset{}{\to} 2 M + 2 {SO}_{2}$

0%

Mg
0%

Pb
0%

Sn
0%

Fe

Compound (D) is

0%

${NaAlO}_{2}$
0%

$Al {(OH)}_{3}$
0%

${Al}_{2} O_{3}$
0%

${Na}_{2} O$

Consider the following metallurgical process

$Sulphide \overset{∆}{\to} oxide \overset{∆}{\to} impure metal \overset{∆}{\to} pure metal$

The various processes A, B, and C respectively

0%
Calcination, smelting, and electrolysis
0%

Roasting, smelting, and electrolysis
0%

Calcination, auto reduction, and bassemetisation
0%

Roasting, aluminothermic reduction, electrolysis

NaCN is used as depresant to-

0%
Separate PbS from ZnS by forming a complex with PbS.
0%
Separate PbS from ZnS by forming a complex with ZnS.
0%
Form froth.
0%
Used as the collector.

Ellingham's diagram for the formation of ${CO}_{2}$ is a straight line in the given graph. This is due to :

0%

Increase in entropy during ${CO}_{2}$ formation.
0%

Decrease in entropy during ${CO}_{2}$ formation.
0%

Entropy remains constant during ${CO}_{2}$ formation.
0%

Can not be predicted.

Which of the following statements is correct regarding the slag obtained during the

extraction of a metal like copper or iron?

0%

The slag is lighter and has a lower melting point than the metal
0%

The slag is heavier and has a lower melting point than the metal
0%

The slag is lighter and has a higher melting point than the metal
0%

The slag is heavier and has a higher melting point than the metal

The process of bringing the metal or its ore into solution by the action of a suitable

chemical reagent followed by extraction of the metal either by electrolysis or by a

the suitable precipitating agent is called

0%
Electrometallurgy
0%

Hydrometallurgy
0%

Electrorefining
0%

Zone refining

Roasting is important in the metallurgy of iron because -

0%

FeO gets oxidized to ${Fe}_{2} O_{3}$ which does not combine with acidic ${SiO}_{2}$
0%

${SiO}_{2}$ is an acidic oxide which can combine with metallic oxides i.e. FeO, and ${Fe}_{2} O_{3}$
0%

FeO when roasted get oxidized to more basic ${Fe}_{2} O_{3}$
0%

None of the above.

ln the process of extraction of silver :

silver ore + ${CN}^{-} + H_{2} O \overset{O_{2}}{\to} [X] + {OH}_{}^{-}$

[X] + Zn $\to$ [Y] + Ag

[X], and [Y] in the above mentioned reaction is:

0%

X= [Ag(CN) $_{2}$ ]^$-$ ; Y = [Zn(CN) $_{4}$ ]^-2
0%

X= [Ag(CN) $_{2}$ ]^-3 '; Y=[Zn(CN) $_{4}$ ]^-2
0%

X= [Ag(CN) $_{2}$ ]^$-$ ;Y=[Zn(CN) $_{6}$ ]^$-$
0%

X=[Ag(CN) $_{4}$ ]^$-$ ;Y= [Zn(CN) $_{4}$ ]^{$-$ 2}

The correct statement among the following is :

0%

Blister copper has blistered appearance due to evolution of ${CO}_{2}$
0%

Vapour phase refining is carried out for Nickel by Van Arkel method.
0%

Pig iron can be moulded into a variety of shapes.
0%

Wrought iron is impure iron with 4% carbon.

Which process does not involved a catalyst?

0%

Haber's process
0%

Thermite process
0%

Ostwald's process
0%

Contact process

Element that is present as the impurity to the maximum extent in the pig iron :

0%

Phosphorus
0%

Manganese
0%

Carbon
0%

Silicon

Electrochemical process is used to extract-

0%

Iron
0%

Lead
0%

Sodium
0%

Silver

0:0:1

Practice Chemistry Quiz Questions and Answers

0:0:1

Practice Chemistry Quiz Questions and Answers

Support mcqexams.com by disabling your adblocker.