The ultrapure metal is obtained by - (1) Calcination (2) Sublimation (3) zone refining (4) None of these

The ultrapure metal is obtained by - (1) Calcination (2) Sublimation (3) zone refining (4) None of these
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(3) zone refining Explanation: The principal stages in the production of ultrapure metals are the preparation of pure chemical compounds, the reduction of the compounds to the elementary state and further purification.
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Ultrapure elements are obtained in the following method of mental refining

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Metals of high purity are obtained by zone refining. Impurities are more soluble in melt in pure metal.

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Heating of a ore below its melting point in the absence of air is known as – (1) Refining (2) Calcination (3) Roasting (4) Smelting

Description : Heating of a ore below its melting point in the absence of air is known as – (1) Refining (2) Calcination (3) Roasting (4) Smelting

Last Answer : (2) Calcination Explanation: Calcination involves simple decomposition of ore on heating below its melting point usually in absence of air to produce new compounds having higher percentage of ... as removing the moisture, organic matter and volatile impurities. Calcination makes the ore porous.

Heating of a ore below its melting point in the absence of air is known as (1) Refining (2) Calcination (3) Roasting (4) Smelting

Description : Heating of a ore below its melting point in the absence of air is known as (1) Refining (2) Calcination (3) Roasting (4) Smelting

Last Answer : Calcination

Explain the process of zone refining. Name one metal refined by this method.

Description : Explain the process of zone refining. Name one metal refined by this method.

Last Answer : The apparatus used for zone refining consists of a circular heater fitted around the rod of impure metal at one end. The circular heater is slowly moved to the other end. At the heated zone, ... in solid metal passes into the adjacent molten part. A metal refined by zone refining is germanium.

Copper is refined by - (1) roasting (2) oxidation (3) electrolysis (4) zone refining

Description : Copper is refined by - (1) roasting (2) oxidation (3) electrolysis (4) zone refining

Last Answer : (1) roasting Explanation: Copper is refined by the method of roasting. In the roaster, the copper concentrate is partially oxidised to produce "calcine" and sulfur dioxide gas. In roasting, the ... ore concentrate is treated with very hot air. This process is generally applied to sulphide minerals.

What is the Principle of Zone refining ?

Description : What is the Principle of Zone refining ?

Last Answer : Ans. : When the molten solution of an impure metal is allowed to cool, the pure metal crystallizes out while the impurities remains in the solution.

Copper is refined by (1) roasting (2) oxidation (3) electrolysis (4) zone refining

Description : Copper is refined by (1) roasting (2) oxidation (3) electrolysis (4) zone refining

Last Answer : roasting

How much temperature is maintained during quicklime manufacture in the calcination zone of the vertical shaft kiln? (A) 500°C (B) 750°C (C) 1000°C (D) 1500°C

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Quick lime (or caustic lime) (A) Is obtained by the calcination of pure lime stone (B) Has great affinity to moisture (C) Is amorphous (D) All the abov

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Hydraulic lime is obtained by (A) Burning of lime stone (B) Burning of kankar (C) Adding water to quick lime (D) Calcination of pure clay

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The ultrapure glass used to manufacture optical fibers is approximately ___pure ∙ a. 99.9 % ∙ b. 99.99 % ∙ c. 99.999 % ∙ d. 99.9999 %

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Zone refining is based on the principle of

Description : Zone refining is based on the principle of

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Assertion : Zone refining method is very useful for producing semiconductors. Reason : Semiconductors are of high purity.

Description : Assertion : Zone refining method is very useful for producing semiconductors. Reason : Semiconductors are of high purity.

Last Answer : Assertion : Zone refining method is very useful for producing semiconductors. Reason : Semiconductors are of high purity.

Zone refining is based on the principle that

Description : Zone refining is based on the principle that

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The method of zone refining of metals is based on the principle of :

Description : The method of zone refining of metals is based on the principle of :

Last Answer : The method of zone refining of metals is based on the principle of : A. Greater mobility of the ... the impurity in the molten state than in the solid

Zone refining is a method to obtain

Description : Zone refining is a method to obtain

Last Answer : Zone refining is a method to obtain A. very high temperature B. ultra pure Al C. ultra pure metals D. ultra pure oxides

Zone refining method is used for refining

Description : Zone refining method is used for refining

Last Answer : Zone refining method is used for refining A. Al B. Ge C. Cu D. Fe

Zone refining is used for the purification of?

Description : Zone refining is used for the purification of?

Last Answer : Ge

What is meant by zone refining or fractional crystallization?

Description : What is meant by zone refining or fractional crystallization?

Last Answer : Zone refining is a technique of obtaining ultra pure metal. It is based on the principle of differences in solubility of impurities in liquid and solid states of the metal.

By which process copper is refined ------? A. Roasting (Answer) B. Oxidation C. Zone Refining D. Electrolysis

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In electro-refining, the pure metal is deposited on – (1) vessel (2) electrolyte (3) cathode (4) anode

Description : In electro-refining, the pure metal is deposited on – (1) vessel (2) electrolyte (3) cathode (4) anode

Last Answer : (3) cathode Explanation: In electro-refining, the anodes consist of unrefined impure metal, and as the current passes through the acidic electrolyte the anodes are corroded into the solution so ... pure metal onto the cathodes. Electrolytic refining is used to extract impurities from crude metals.

In electro-refining, the pure metal is deposited on (1) vessel (2) electrolyte (3) cathode (4) anode

Description : In electro-refining, the pure metal is deposited on (1) vessel (2) electrolyte (3) cathode (4) anode

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How many of the following statement is /are ture for calcination of metal ore ?

Description : How many of the following statement is /are ture for calcination of metal ore ?

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In extraction of metal how many of the following ores calcination process is involved . (i) Dolomite (ii) Malachite (iii) Calcite (iv) Copper pyrities

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Common salt is obtained from sea water by the process of (a) sublimation (b) evaporation (c) crystallisation (d) filtration

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Refining process of impure metals depends upon the differences in properties of the metal. Extraction of Al is usually carried out from its bauxite or

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Refining process of impure metals depends upon the differences in properties of the metal. Extraction of Al is usually carried out from its bauxite or

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During electro refining, Pure Metal is collected at

Description : During electro refining, Pure Metal is collected at

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The correct sequence of steps involved in extraction of metal from its ore is a) removal of impurities, purify metal, reduction of ore b) purify metal, removal of impurities, reduction of metal ore . c) concentration of ore , refining of metal , reduction d) removal of impurities from ore , reduction of ore , refining of metal

Description : The correct sequence of steps involved in extraction of metal from its ore is a) removal of impurities, purify metal, reduction of ore b) purify metal, removal of impurities, reduction of metal ore . c ... of metal , reduction d) removal of impurities from ore , reduction of ore , refining of metal

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.Identify the physical and chemical changes from the following (i)Burning of magnesium in air (ii)Electrolysis of water (iii)Tarnishing of silver spoon (iv)Sublimation of iodine -Chemistry

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What is meant by sublimation ? What is subtraction ?

Description : What is meant by sublimation ? What is subtraction ?

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Sodium vapour lamps glow with yellow colour. This is due to - (1) sublimation of sodium to emit yellow colour (2) the emission of excess energy absorbed by sodium atoms, in the yellow region of the spectrum (3) the low ionisation energy of sodium (4) its ability to absorb all other colours except yellow

Description : Sodium vapour lamps glow with yellow colour. This is due to - (1) sublimation of sodium to emit yellow colour (2) the emission of excess energy absorbed by sodium atoms, in the yellow region of the ... (3) the low ionisation energy of sodium (4) its ability to absorb all other colours except yellow

Last Answer : (2) the emission of excess energy absorbed by sodium atoms, in the yellow region of the spectrum Explanation: Sodium Vapour Lamps glow with yellow colour due to the emission of excess energy absorbed by sodium atoms, in the yellow region of the spectrum.

Iron is prevented from rusting by coating with zinc. This process is called as – (1) Galvanisation (2) Corrosion (3) Sublimation (4) Reduction

Description : Iron is prevented from rusting by coating with zinc. This process is called as – (1) Galvanisation (2) Corrosion (3) Sublimation (4) Reduction

Last Answer : (1) Galvanisation Explanation: Galvanization is the process of applying a protective zinc coating to steel or iron, in order to prevent rusting. The term is derived from the name of Italian scientist Luigi ... is hot-dip galvanization, in which steel parts are sub-merged in a bath of molten zinc.

The process of dissolving an acid or a base in water is a highly - (1) Exothermic reaction (2) Endothermic reaction (3) Sublimation reaction (4) Redux reaction

Description : The process of dissolving an acid or a base in water is a highly - (1) Exothermic reaction (2) Endothermic reaction (3) Sublimation reaction (4) Redux reaction

Last Answer : (1) Exothermic reaction Explanation: The process of dissolving an acid or a base in water is a highly exothermic one. This is why care must be taken while mixing concentrated nitric acid or sulphuric acid with water.

Iron filings can be separated from a heterogenous mixture using the technique of (1) Sublimation (2) Magnetization (3) Sedimentation (4) Evaporation

Description : Iron filings can be separated from a heterogenous mixture using the technique of (1) Sublimation (2) Magnetization (3) Sedimentation (4) Evaporation

Last Answer : (2) Magnetization Explanation: The method of separation using magnets is used when one of the components is magnetic. So the heterogeneous mixture of iron filings and some other material (such as sulphur ... by using magnets. Similarly, a mixture of sand and iron filings can be separated by magnet.

Iodine can be separated from a mixture of Iodine and Potassium Chloride by - (1) Filtration (2) Sublimation (3) Distillation (4) Sedimentation

Description : Iodine can be separated from a mixture of Iodine and Potassium Chloride by - (1) Filtration (2) Sublimation (3) Distillation (4) Sedimentation

Last Answer : (2) Sublimation Explanation: Iodine can be separated from a mixture of Iodine and Potassium Chloride by Sublimation. Sublimation is the transition of a substance directly from the solid to the gas phase, without passing through the intermediate liquid phase.

Iodine can be separated from a mixture of Iodine and Potassium Chloride by – (1) sedimentation (2) filtration (3) sublimation (4) distillation

Description : Iodine can be separated from a mixture of Iodine and Potassium Chloride by – (1) sedimentation (2) filtration (3) sublimation (4) distillation

Last Answer : (3) sublimation Explanation: Iodine is well known to sublime (change from solid to gas without becoming liquid in between) when heated. However sodium chloride has a melting point much higher ... by using a sublimation apparatus, with solid iodine collected by condensation on a cold surface.

Water can be separated from alcohol water mixture by – (1) decantation (2) evaporation (3) distillation (4) sublimation

Description : Water can be separated from alcohol water mixture by – (1) decantation (2) evaporation (3) distillation (4) sublimation

Last Answer : (3) distillation Explanation: Distillation is a method of separating mixtures based on differences in volatilities of components in a boiling liquid mixture. Distillation is a unit operation, or a ... is distilled to separate its components- notably oxygen, nitrogen, and argon- for industrial use.

Which of the following is a physical change? (1) oxidation (2) reduction (3) sublimation (4) decomposition

Description : Which of the following is a physical change? (1) oxidation (2) reduction (3) sublimation (4) decomposition

Last Answer : (3) sublimation Explanation: Sublimation is a type of phase transition, or a change in a state of matter, just like melting, freezing, and evaporation.

What is sublimation? What kind of organic compounds can be purified by this technique?

Description : What is sublimation? What kind of organic compounds can be purified by this technique?

Last Answer : Process of change of solid substance directly into vapour phase without the intermediate liquid state is called sublimation. This technique is used to separate sublimable compounds.Like camphor ,ammonium chloride.

Which type of intermolecular forces are effected in each of the following process: (i)Sublimation of iodine. (ii)Evaporation of water.

Description : Which type of intermolecular forces are effected in each of the following process: (i)Sublimation of iodine. (ii)Evaporation of water.

Last Answer : Ans. (i) Sublimation of iodine : Dispersion forces. (ii)Evaporation of water : Hydrogen bond.

Define the following : Sublimation , Melting Point , Fusion , Evaporations , Boiling Point , Vapourization , Condensation , Deposition.

Description : Define the following : Sublimation , Melting Point , Fusion , Evaporations , Boiling Point , Vapourization , Condensation , Deposition.

Last Answer : Ans : Sublimation : Sublimation is the process in which some solids upon heating instead of changing into liquid state are converted directly into gaseous (vapour) state. Example : Ammonium Chloride ... happens from the gaseous phase into the solid phase directly, the change is called deposition.

The process of a solid converting directly into a gas is called: w) fusion x) sublimation y) condensation z) distillation

Description : The process of a solid converting directly into a gas is called: w) fusion x) sublimation y) condensation z) distillation

Last Answer : ANSWER: X -- SUBLIMATION 

The bubbling off of carbon dioxide when a bottle of carbonated beverage is opened is a good example of: w) deliquescence x) effervescence y) condensation z) sublimation

Description : The bubbling off of carbon dioxide when a bottle of carbonated beverage is opened is a good example of: w) deliquescence x) effervescence y) condensation z) sublimation

Last Answer : ANSWER: EFFERVESCENCE

Copper is refined commercially by a process of: w) smelting x) electrolysis y) sublimation z) roasting

Description : Copper is refined commercially by a process of: w) smelting x) electrolysis y) sublimation z) roasting

Last Answer : ANSWER: X -- ELECTROLYSIS

Iron filings can be separated from a heterogenous mixture using the technique of : (1) Sublimation (2) Magnetization (3) Sedimentation (4) Evaporation

Description : Iron filings can be separated from a heterogenous mixture using the technique of : (1) Sublimation (2) Magnetization (3) Sedimentation (4) Evaporation

Last Answer : Magnetization

Iron is prevented from rusting by coating with zinc. This process is called as (1) Galvanisation (2) Corrosion (3) Sublimation (4) Reduction

Description : Iron is prevented from rusting by coating with zinc. This process is called as (1) Galvanisation (2) Corrosion (3) Sublimation (4) Reduction

Last Answer : Galvanisation

Sodium vapour lamps glow with yellow colour. This is due to (1) sublimation of sodium to emit yellow colour (2) the emission of excess energy absorbed by sodium atoms, in the yellow region of the spectrum (3) the low ionisation energy of sodium (4) its ability to absorb all other colours except yellow

Description : Sodium vapour lamps glow with yellow colour. This is due to (1) sublimation of sodium to emit yellow colour (2) the emission of excess energy absorbed by sodium atoms, in the yellow region of the ... (3) the low ionisation energy of sodium (4) its ability to absorb all other colours except yellow

Last Answer : the emission of excess energy absorbed by sodium atoms, in the yellow region of the spectrum

Iodine can be separated from a mixture of Iodine and Potassium Chloride by (1) sedimentation (2) filtration (3) sublimation (4) distillation

Description : Iodine can be separated from a mixture of Iodine and Potassium Chloride by (1) sedimentation (2) filtration (3) sublimation (4) distillation

Last Answer : sublimation