Bottom of Pyramid - Test # 32 - MetallurgyContact Number: 8527521718Bottom of Pyramid - Test # 32 - MetallurgyContact Number: 8527521718High purity copper metal is obtained by:
1. Carbon reduction
2. Hydrogen reduction
3. Electrolytic reduction
4. Thermite process
Thomas slag is:
1. calcium silicate
2. calcium phosphate
3. tricalcium phosphate and calcium silicate
4. calcium ammonium phosphate
Heating of carbonate ores to remove carbon is called as:
1. Roasting
2. Calcination
3. Smelting
4. Fluxing
Sulphide ores are common for the metals:
1. Ag, Cu and Pb
2. Ag, Cu and Sn
3. Ag, Mg and Pb
4. Al, Cu and Pb
Which element occurs freely in nature?
1. Iodine
2. Sulphur
3. Phosphorus
4. Magnesium
The metal used in storage batteries is:
1. Cu
2. Sn
3. Pb
4. Ni
Silver obtained by argentiferrous lead is purified by:
1. distillation
2. froth floatation
3. cupellation
4. reacting with KCN
Which process is not used in purification of bauxite?
1. Hall's method
2. Baeyer's method
3. Serpek's method
4. Frankland's method
Chloride ore among the following is:
1. malachite
2. magnesite
3. magnetite
4. Karnalite
Chalcogens are:
1. hydrocarbons
2. ore forming elements
3. oxide forming elements
4. those having ability to catenate
Which pair of elements can form alloy?
1. Zn and Cu
2. Fe and Hg
3. Fe and C
4. C and Pt
Cupellation process is used in the metallurgy of:
1. copper
2. silver
3. lead
4. iron
Liquation is used to purify:
1. Pb
2. Sn
3. Bi
4. All
Blood haemoglobin contains:
1. Al
2. Mg
3. Cu
4. Fe
Wolframite ore contains:
1. Zn
2. W
3. Hf
4. Au
The process in which ore is heated in limited supply of air below its melting point is known as:
1. Roasting
2. Calcination
3. Reduction
4. Distillation
Iron is made inactive or passive by:
1. H3PO4
2. conc. HNO3
3. conc. H2SO4
4. dil. HNO3
The inner lining of a blast furnace is made up of:
1. graphite bricks
2. silica bricks
3. fire clay bricks
4. basic bricks
Plumbo-solvency refers to:
1. oxidation of lead to lead oxide
2. oxidation of lead to red lead
3. dissolution of lead in water containing air
4. making lead wires by forcing heated metal through a die
Rutile is an ore of:
1. Ti
2. Zr
3. Mn
4. V
Which is not a mineral?
1. Mica
2. Peat
3. Quartz
4. Felspar
In the Hall's process for concentration of bauxite , the ore is fused with:
1. NaHCO3
2. Na2CO3
3. NaF
4. Na3AIF6
Alloy is an example of:
1. gel
2. aerosol
3. solid sol
4. emulsion
The second most common element on the earth is:
1. silicon
2. hydrogen
3. nitrogen
4. oxygen
Nickel is purified by thermal decomposition of its:
1. Hydride
2. Chloride
3. Azide
4. Carbonyl
In Serpek's process , by product obtained in the purification of bauxite is:
1. Al2O3
2. N2
3. NH3
4. none
In the metallurgy of copper, the slag is -
1. FeSiO3
2. CaCO3
3. CaSiO3
4. CaO
Galena contains ZnS with PbS. Which of the following is used as depressant to stop ZnS to come with foam?
1. NaCN
2. Aniline
3. Pine Oil
4. H2O
Vapour phase refining can be carried out in case of
1. Ni
2. Zr
3. Ti
4. All of these
Percentage of silver in the alloy, German Silver is:-
1. 2.5%
2. 1.5%
3. 10%
4. 0%
Extraction of gold and silver involves leaching with CN- ion. Silver is later recovered by
(1) liquation
(2) distillation
(3) zone refining
(4) displacement with Zn
Aluminium is extracted from alumina (Al2O3) by electrolysis of a molten mixture of :
1. Al2O3 + HF + NaAlF4
2. Al2O3 + CaF2 + NaAlF4
3. Al2O3 + Na3AlF6 + CaF2
4. Al2O3 + KF +Na3AlF6
Consider the following reactions at 1000 oC.
(I) ZnS + 1/2O2(g) \(\xrightarrow[]{\Delta }\) ZnO(g); ∆Go = -360 kJ mol-1
(II) Cs + 1/2O2(g) \(\xrightarrow[]{\Delta }\) CO(g); ∆Go = -460 kJ mol-1
Choose the correct statement about the above reactions at 1000 oC:
1. ZnO is more stable than CO
2. ZnO can be reduced to Zn by C
3. ZnO, and CO are formed at an equal rate
4. ZnO can not be reduced to Zn by C
Incorrect match is :
(a) Purification of Al :Baeyer's method
(b) polling :Reduction of
(C) (chromite ore) : NaOH/N
(d) Ag: Mac Arthur cyanideprocess
AgCl on fusion with sodium carbonate, gives:
1.
2.
3.
4.
A substance that can act as collector in the froth floatation method is -
1. Sodium xenate.
2. Sodium pyrophosphate.
3. Sodium nitroprusside.
4. Sodium ethyl xanthate.
What is the composition of the anode mud used in the electrolytic refining of silver?
1. Zn, Cu, Ag, Au
2. Zn, Ag, Au
3. Cu, Ag, Au
4. Au only
In the purification of impure nickel by Mond's process, metal is purified by:
(1) Electrolytic reduction
(2) Vapour phase thermal decomposition
(3) Thermite reduction
(4) Carbon reduction
The reduction of an oxide by aluminium is called:
(1) Bayer's process
(2) Goldschmidt's aluminothermite process
(3) Hall's process
(4) van Arkel process
Which is not correctly matched:
(a) spieglesian : Mn+Fe+C
(b) Dow's sea water process :
(c) parke's process :Ag
(d) liquation spelter(Impure Zn
For which of the following metals Bessemerisation process is important?
I : Fe, II : Cu, III : Al, IV : Silver :
(1) I, II
(2) II, III
(3) I, III
(4) all
The chemical composition of "slag" formed during the smelting process in the extraction of copper is:
1. Cu2 + FeS
2. FeSiO3
3. CuFeS
4. Cu2S + FeO
Which of the following statement is incorrect about the extractive metallurgy of copper?
(1) Matte chiefly consists of cuprous sulfide and some ferrous sulphide.
(2) Most of the impurity of iron sulphide is removed as fusible slag during roasting.
(3) The copper pyrites is concentrated by froth floatation process.
(4) self reduction and electrolysis respectively.
Which of the following process is used in the extractive metallurgy of magnesium?
1. Fused salt electrolysis
2. Self reduction
3. Aqueous solution electrolysis
4. Thermite process.
White bauxite is purified by:
(1) Baeyer's process
(2) Hoop's process
(3) Serpeck's process
(4) Hall's process