Consider the following reactions at 1000 ° C . ( I ) Zn s + 1 / 2 O 2 g → ∆ ZnO g ; ∆ G ° = - 360 kJ mol - 1 ( II ) C s + 1 / 2 O 2 g → ∆ CO g ; ∆ G ° = - 460 kJ mol - 1 and choose the correct statement at 1000 ° C :

ZnO, and CO are formed at an equal rate

ZnO can not be reduced to Zn by C

() Purification of Al :Baeyer's method

() polling :Reduction of C u 2 O

(C) F e C r 2 O 4 (hromite ore) : NaOH/N a 2 C O 3

() Ag: Mac Arthur cyanideprocess

Nickel is purified by thermal decomposition of its:

0%

Hydride
0%

Chloride
0%

Azide
0%

Carbonyl

In Serpek's process , by product obtained in the purification of bauxite is:

0%

Al₂O₃
0%

N₂
0%

NH₃
0%

none

CO is used in the metallurgy of:

0%

Cu
0%

Ni
0%

Cr
0%

Pt

In the cyanide extraction process of silver from argentite ore, the oxidizing and reducing agents used for:

0%

O₂ and CO respectively
0%

O₂ and Zn dust respectively
0%

HNO₃ and Zn dust respectiely
0%

HNO₃ and CO respectively

Name the metal M which is extracted on the basis of following reactions,

4M+8CN^-+2H₂O+O₂ $\to$ 4[M(CN)₂]^-+4OH^-

2[M(CN)₂]^-+Zn $\to$ [Zn(CN)₄]^2-+2M

0%

nickel
0%

silver
0%

copper
0%

mercury

Impurities present in the ore which react to form fusible substance are known as

0%

Flux
0%

Gangue
0%

Mugget
0%

Mineral

Serpek's method involves the heating of bauxite with

0%

NaOH
0%

Na₂CO₃
0%

N₂ + C
0%

CaCO₃

In the metallurgy of copper, the slag is -

0%

FeSiO₃
0%

CaCO₃
0%

CaSiO₃
0%

CaO

Galena contains ZnS with PbS. Which of the following is used as depressant to stop ZnS to come with foam?

0%

NaCN
0%

Aniline
0%

Pine Oil
0%

H₂O

Which of the following is leached with NaCN?

0%

Ore of Al
0%

Ore of Cu
0%

Ore of Ag
0%

Ore of Zn

Vapour phase refining can be carried out in case of

0%

Ni
0%

Zr
0%

Ti
0%

All of these

Out of the following which metal can be purified by the Van Arkel method?

0%

Ti
0%

Zr
0%

Hf
0%

All of these

Which of the following has a negative slope?

0%

C $\to$ CO
0%

Fe $\to$ Fe₂O₃
0%

Mg $\to$ MgO
0%

All of the above

Aluminium is used as a reducing agent in the reduction of :-

0%

Cr₂O₃
0%

SnO₂
0%

ZnO
0%

HgO

Percentage of silver in the alloy, German Silver is:-

0%

0%
0%

2.5%
0%

1.5%
0%

10%

Mond's process is used for

0%

Ni
0%

Al
0%

Fe
0%

Cu

Extraction of gold and silver involves leaching with CN^- ion. Silver is later recovered by

0%

liquation
0%

distillation
0%

zone refining
0%

displacement with Zn

Match items of Column I with the items of Column II and assign the correct code.
Column l Column II
A. Cyanide process 1. Ultrapure Ge
B. Froth floatation process 2. Dressing of ZnS
C. Electrolytic reduction 3. Extraction of Al
5. Purification of Ni
Codes
A B C D
(a) 2 3 1 5

0%
(b) 1 2 3 4
0%
(d) 4 2 3 1
0%
(c) 3 4 5 1
0%
D. Zone refining 4. Extraction of Au

Aluminium is extracted from alumina (Al₂O₃) by electrolysis of a molten mixture of :

0%

Al₂O₃+ HF + NaAlF₄
0%

Al₂O₃ + CaF₂ + NaAlF₄
0%

Al₂O₃ + Na₃AlF₆ + CaF₂
0%

Al₂O₃ + KF +Na₃AlF₆

Copper is obtained during extraction by the reduction of cuprous oxide with :

0%

Cu₂S
0%

SO₂
0%

FeS
0%

CO

A pair of metals among the following can be purified by van Arkel method is -

0%

Zr, and Ti
0%

Ag, and Au
0%

Ni, and Fe
0%

Ga, and In

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

0%

Galena
0%

Copper pyrite
0%

Sphalerite
0%

Argentite.

Pb and Sn are extracted from their chief ore by:

0%

carbon reduction and self-reduction respectively.
0%

self-reduction and carbon reduction respectively.
0%

electrolysis and self-reduction respectively.
0%

self-reduction and self-reduction respectively.

Which of the following process is used in the extractive metallurgy of magnesium?

0%

Fused salt electrolysis
0%

Self reduction
0%

Aqueous solution electrolysis
0%

Thermite process.

White bauxite is purified by:

0%

Baeyer's process
0%

Hoop's process
0%

Serpeck's process
0%

Hall's process

Consider the following reactions at $1000 ° C .$

$(I) Zn (s) + 1 / 2 O_{2} (g) \overset{∆}{\to} ZnO (g); ∆ G ° = - 360 kJ {mol}^{- 1} (II) C (s) + 1 / 2 O_{2} (g) \overset{∆}{\to} CO (g); ∆ G ° = - 460 kJ {mol}^{- 1}$

and choose the correct statement at $1000 ° C$ :

0%

ZnO is more stable than CO
0%

ZnO can be reduced to Zn by C
0%

ZnO, and CO are formed at an equal rate
0%

ZnO can not be reduced to Zn by C

Chromium is obtained by reducing concentrated chromite ore with :

0%

Red hot coke
0%

Gaseous hydrogen
0%

Aluminium powder
0%

Carbon monoxide

Which is not correctly matched:

0%

spieglesian : Mn+Fe+C
0%

Dow's sea water process : $M g {(O H)}_{2}$
0%

parke's process :Ag
0%

liquation spelter(Impure Zn

Incorrect match is :

0%

() Purification of Al :Baeyer's method
0%

() polling :Reduction of $C u_{2} O$
0%

(C) $F e C r_{2} O_{4}$ (hromite ore) : NaOH/N $a_{2}$ $C O_{3}$
0%

() Ag: Mac Arthur cyanideprocess

Aluminium metal is purified by:

0%

Hoope's process
0%

Hall's process
0%

Serpeck's process
0%

Baeyer's process

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

0:0:1

Practice Chemistry Quiz Questions and Answers

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

0:0:1

Practice Chemistry Quiz Questions and Answers

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