Chalcogens are: 

  • hydrocarbons 

  • ore forming elements 

  • oxide forming elements

  • those having ability to catenate

Which process is not used in purification of bauxite?

  • Hall's method

  • Baeyer's method

  • Serpek's method

  • Frankland's method

Chloride ore among the following is:

  • malachite

  • magnesite

  • magnetite

  • Karnalite

Corundum is:

 

  • SrO2

  • Al2O3

  • CaCl2

  • Cu2Cl2

Heating of carbonate ores to remove carbon is called as:

  • Roasting

  • Calcination

  • Smelting

  • Fluxing

Sulphide ores are common for the metals:

  • Ag, Cu and Pb

  • Ag, Cu and Sn

  • Ag, Mg and Pb

  • Al, Cu and Pb

Which element occurs freely in nature?

  • Iodine

  • Sulphur

  • Phosphorus

  • Magnesium

Silver obtained by argentiferrous lead is purified by:

  • distillation

  • froth floatation

  • cupellation

  • reacting with KCN

High purity copper metal is obtained by:

  • Carbon reduction

  • Hydrogen reduction

  • Electrolytic reduction

  • Thermite process

Aluminothermic process is used for the extraction of metals, whose oxides are:

  • fusible

  • not easily reduced  by carbon

  • not easily reduced by hydrogen

  • strongly basic

Purest form of iron is:

  • cast iron

  • hard steel

  • stainless steel

  • wrought iron

Thomas slag is:

  • calcium silicate

  • calcium  phosphate

  • tricalcium phosphate and calcium silicate

  • calcium ammonium phosphate

The following equation represents a method of purification of nickel by,

Ni + 2CO →320KNi(CO)4 →420KNi +4CO this method is:

impure                                 pure

  • Cupellation

  • Mond's process

  • Van Arkel method

  • Zone refining

Which pair of elements can form alloy?

  • Zn and Cu

  • Fe and Hg

  • Fe and C

  • C and Pt

Cupellation process is used in the metallurgy of:

  • copper

  • silver

  • lead

  • iron

Chile saltpetre is the ore of:

  • Mg

  • K

  • Na

  • Ca

Blast furnace is used in the metallurgy of:

  • Al

  • Fe

  • gold

  • Ag

Liquation is used to purify:

  • Pb

  • Sn

  • Bi

  • All

Wolframite ore contains:

  • Zn

  • W

  • Hf

  • Au

The process in which ore is  heated in limited supply of air below its melting point  is known as:

  • Roasting

  • Calcination

  • Reduction

  • Distillation

Iron is made inactive or passive by:

  • H3PO4

  • conc. HNO3

  • conc. H2SO4

  • dil. HNO3

The inner lining of a blast furnace is  made up of:

  • graphite bricks

  • silica  bricks

  • fire clay bricks

  • basic bricks

Froth floatation process for the concentration of ores is a practical application of:

  • adsorption

  • absorption

  • coagulation

  • sedimentation

Roasting is generally carried out in case of :

  • Oxide ores

  • Sulphide ores

  • Silicate ores

  • Carbonate ores

Which substance is used as basic refractory material in furnace?

  • Al2O3

  • SiO2

  • CaO

  • Fe2O3

Rutile is an ore of:

  • Ti

  • Zr

  • Mn

  • V

Which is not a mineral?

  • Mica

  • Peat

  • Quartz

  • Felspar

Which element is purified by Zone refining?

  • Ge

  • Ge and Si

  • Si

  • None

Alloy is an example of:

  • gel

  • aerosol

  • solid sol

  • emulsion

The second most common element on the earth is:

  • silicon

  • hydrogen

  • nitrogen

  • oxygen

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