# Metallurgical Operations Test 4

Total Questions:50 Total Time: 75 Min

Remaining:

## Questions 1 of 50

Question:The most abundant element on earth crust is

Hydrogen

Oxygen

Silicon

Carbon

## Questions 2 of 50

Question:Naturally occurring substances from which a metal can be profitably (or economically) extracted are called

Minerals

Ores

Gangue

Salts

## Questions 3 of 50

Question:Titanium containing mineral found in our country is

Bauxite

Dolomite

Chalcopyrites

Elmanite

## Questions 4 of 50

Question:Which of the following substances consists of only one element

Marble

Sand

Diamond

Glass

## Questions 5 of 50

Question:Which of the following minerals is not an ore of aluminum

Bauxite

Gypsum

Cryolite

Corundum

## Questions 6 of 50

Question:An example of halide ore is

Galena

Bauxite

Cinnabar

Cryolite

## Questions 7 of 50

Question:Which of the following is not an ore

Bauxite

Malachite

Zinc blende

Pig iron

## Questions 8 of 50

Question:Formula of magnetite is

$$F{e_2}{O_3}$$

$$Fe{S_2}$$

$$FeC{O_3}$$

$$F{e_3}{O_4}$$

## Questions 9 of 50

Question:Which of the following is ferrous alloy

Invar

Solder

Magnalium

Type metal

## Questions 10 of 50

Question:Which of the following ores does not represent the ore of iron

Haematite

Magnetite

Cassiterite

Limonite

## Questions 11 of 50

Question:The formula of haematite is

$$F{e_3}{O_4}$$

$$F{e_2}{O_3}$$

$$FeC{O_3}$$

$$Fe{S_2}$$

## Questions 12 of 50

Question:An example of an oxide ore is

Bauxite

Malachite

Zinc blende

Felspar

## Questions 13 of 50

Question:Cryolite is an ore of

Iron

Silver

Zinc

Aluminium

## Questions 14 of 50

Question:Cassiterite is an ore of

$$Mn$$

$$Ni$$

$$Sb$$

$$Sn$$

## Questions 15 of 50

Question:Which one of the following is the most abundant element in the universe

Nitrogen

Hydrogen

Oxygen

Silicon

## Questions 16 of 50

Question:Which of the following is not a mineral of iron ?

Magnetite

Siderite

Smithsonite

Limonite

Haematite

## Questions 17 of 50

Question:The ore carnalite is represented by structure:

$$N{a_2}A{l_2}{O_3}$$

$$N{a_3}Al{F_6}$$

$$KCl.MgC{l_2}6{H_2}O$$

$$F{e_3}{O_4}$$

## Questions 18 of 50

Question:Which of the following metal is sometimes found native in nature

$$Al$$

$$Cu$$

$$Fe$$

$$Mg$$

## Questions 19 of 50

Question:The most abundant metal in the earth crust is

$$Na$$

$$Mg$$

$$Al$$

$$Fe$$

## Questions 20 of 50

Question:Froth floatation process for the concentration of ores is an illustration of the practical application of

Absorption

Coagulation

Sedimentation

## Questions 21 of 50

Question:Iron ore is concentrated by

Froth floatation

Electrolysis

Roasting

Magnetic treatment

## Questions 22 of 50

Question:An ore of tin containing $$FeCr{O_4}$$ is concentrated by

Magnetic separation

Froth floatation

Electrostatic method

Gravity separation

## Questions 23 of 50

Question:One of the following metals forms a volatile compound and this property is taken advantage for its extraction. This metal is

Iron

Nickel

Cobalt

Tungsten

## Questions 24 of 50

Question:Roasting is generally done in case of the following

Oxide ores

Silicate ores

Sulphide ores

Carbonate ores

## Questions 25 of 50

Question:Heating of pyrites in air for oxidation of sulphur is called

Roasting

Calcination

Smelting

Slagging

## Questions 26 of 50

Question:Which is not basic flux

$$CaC{O_3}$$

Lime

$$Si{O_2}$$

$$CaO$$

## Questions 27 of 50

Question:A substance which reacts with gangue to form fusible material is called

Flux

Catalyst

Ore

Slag

## Questions 28 of 50

Question:Calcination is the process of heating the ore

In a blast furnace

In absence of air

In presence of air

None of these

## Questions 29 of 50

Question:Smelting is termed to the process in which

The ore is heated in the absence of air

Ore is cold

The ore is heated in the presence of air

Ore is melted

## Questions 30 of 50

Question:The metallurgical process in which a metal is obtained in a fused state is called

Smelting

Roasting

Calcination

Froth floatation

## Questions 31 of 50

Question:Which of the following processes involves smelting

$$ZnC{O_3} \to ZnO + C{O_2}$$

$$F{e_2}{O_3} + 3C \to 2Fe + 3CO$$

$$2PbS + 3{O_2} \to 2PbO + 2S{O_2}$$

$$A{l_2}{O_3}.2{H_2}O \to A{l_2}{O_3} + 2{H_2}O$$

## Questions 32 of 50

Question:The impurties associated with minerals used in metallurgy are collectively called

Slag

Flux

Gangue

Ore

## Questions 33 of 50

Question:When a metal is to be extracted from its ore, if the gangue associated with the ore is silica, then

An acidic flux is needed

A basic flux is needed

Both acidic and basic flux are needed

Neither of them is needed

## Questions 34 of 50

Question:Which statement is correct

Gangues are carefully chosen to combine with the slag present in the ore to produce easily fusible flux to carry away the impurities

Slags are carefully chosen to combine with the flux present in the ore to produce easily fusible gangue to carry away the impurities

Gangues are carefully chosen to combine with the flux present in the ore to produce easily fusible slag to carry away the impurities

Fluxes are carefully chosen to combine with the gangue present in the ore to produce easily fusible slag to carry away the impurities

## Questions 35 of 50

Question:Roasting of copper pyrites ores is for the following purposes

To burn off sulphur, arsenic, antimony etc. as oxides and convert all the iron and copper to their oxides

To burn off arsenic, antimony etc. as oxides and burn off sulphur so that enough of it remains to combine with all the copper

To burn off sulphur partially to leave enough to combine with arsenic, antimony etc. and to convert all the iron and copper to oxides

To melt arsenic and antimony sulphides etc. and remove them by liquation and to burn off sulphur partially to leave enough to combine with copper and iron

## Questions 36 of 50

Question:Refractory metals are used in construction of furnaces because

They can withstand high temperature

They are chemically inert

Their melting point is high

None of these

## Questions 37 of 50

Question:$$C{N^ - }$$solution used in extraction of which metal

$$Ag$$

$$Ti$$

$$Zn$$

$$Sn$$

## Questions 38 of 50

Question:In a line kiln, to get higher yield of $$C{O_2}$$, the measure that can be taken is

To remove $$CaO$$

To add more $$CaC{O_3}$$

To maintain high temperature

To pump out $$C{O_2}$$

## Questions 39 of 50

Question:The substance used in the thermite process of reducing metal ores is

Aluminium

Thorium

Heated Pt gauge

Carbon

## Questions 40 of 50

Question:The electrolytic method of reduction is employed for the preparation of metals that

Are weakly electropositive

Are moderately electropositive

Are strongly electropositive

Form oxides

## Questions 41 of 50

Question:Which of the following metals cannot be extracted by carbon reduction process

$$Pb$$

$$Al$$

$$Hg$$

$$Zn$$

## Questions 42 of 50

Question:Carbon reduction process is used for the extraction of

$$Hg$$

$$Zn$$

$$Cr$$

$$Fe$$

## Questions 43 of 50

Question:Iron is obtained on a large scale from $$F{e_2}{O_3}$$ by

Reduction with $$Al$$

Reduction with $$CO$$

Reduction with $${H_2}$$

Reduction with sodium

## Questions 44 of 50

Question:After partial roasting, the sulphide of copper is reduced by

Reduction by carbon

Electrolysis

Self–reduction

Cyanide process

## Questions 45 of 50

Question:High purity copper metal is obtained by

Carbon reduction

Hydrogen reduction

Electrolytic reduction

Thermite reduction

## Questions 46 of 50

Question:In the metallurgical extraction of zinc from $$ZnO$$ the reducing agent used is

Carbon monoxide

Sulphur dioxide

Carbon dioxide

Nitric oxide

## Questions 47 of 50

Question:Metals are

Electropositive

Electronegative

Acceptor of electrons

None of these

## Questions 48 of 50

Question:The cyanide process is used for obtaining

$$Na$$

$$Ag$$

$$Cu$$

$$Zn$$

## Questions 49 of 50

Question:In electrolytic refining, the impure metal is made is used to make

Cathode

Anode

Electrolytic bath

None of these

## Questions 50 of 50

Question:Of the following, which cannot be obtained by electrolysis of the aqueous solution of their salts

$$Ag$$
$$Mg$$ and $$Al$$
$$Cu$$
$$Cr$$