Ultra purification of a metal is done by (1) slugging (2) zone melting (3) smelting (4) leaching

Ultra purification of a metal is done by (1) slugging (2) zone melting (3) smelting (4) leaching
by

1 Answer

Answer :

(2) zone melting Explanation: When metals are required in a ultra pure state, the zone refining method is used. The principleemployed states that the impurities, which lower the melting point of a metal remain preferentially dissolved in the liquid phase and purer metal will emerge in the solid phase.
by
selected

Related questions

Ultra purification of a metal is done by : (1) slugging (2) zone melting (3) smelting (4) leaching

Description : Ultra purification of a metal is done by : (1) slugging (2) zone melting (3) smelting (4) leaching

Last Answer : zone melting

Ultra purification of a Metal is done by–

Description : Ultra purification of a Metal is done by–

Last Answer : Zone Melting

Uranium is recovered from its ore (pitchblende) by (A) Froth floatation technique (B) Leaching with sulphuric acid (C) Smelting in a furnace (D) Dissolving in water

Description : Uranium is recovered from its ore (pitchblende) by (A) Froth floatation technique (B) Leaching with sulphuric acid (C) Smelting in a furnace (D) Dissolving in water

Last Answer : (B) Leaching with sulphuric acid

The leaching solvent used in Baeyer's process for the purification of bauxite is (A) Ammonium hydroxide (B) Sodium carbonate (C) Sodium hydroxide (D) Ammonium carbonate

Description : The leaching solvent used in Baeyer's process for the purification of bauxite is (A) Ammonium hydroxide (B) Sodium carbonate (C) Sodium hydroxide (D) Ammonium carbonate

Last Answer : Option B

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

__________ is the process used for setting up compressive stresses in the surface of a metal to improve its fatigue strength. (A) Lancing (B) Shot peening (C) Slugging (D) Spinning

Description : __________ is the process used for setting up compressive stresses in the surface of a metal to improve its fatigue strength. (A) Lancing (B) Shot peening (C) Slugging (D) Spinning

Last Answer : (B) Shot peening

Flux addition during smelting of ore is done to (A) Remove impurities/gangue (B) Enhance rate of reaction (C) Accelerate reduction of ore (D) Separate slag from metal

Description : Flux addition during smelting of ore is done to (A) Remove impurities/gangue (B) Enhance rate of reaction (C) Accelerate reduction of ore (D) Separate slag from metal

Last Answer : (A) Remove impurities/gangue

Which one of the following reactions occur during smelting in the reduction zone at lower temperature(in iron metallurgy)?

Description : Which one of the following reactions occur during smelting in the reduction zone at lower temperature(in iron metallurgy)?

Last Answer : Which one of the following reactions occur during smelting in the reduction zone at lower temperature(in iron ... CO` D. `CO_(2)+C rarr 2CO`

Zone refining is used for the purification of?

Description : Zone refining is used for the purification of?

Last Answer : Ge

Reclamation of saline soil which of the following practice is followed ? — a. Adequate drainage b. By good quality irrigation water c. Leaching of salts below root zone d. All of these

Description : Reclamation of saline soil which of the following practice is followed ? — a. Adequate drainage b. By good quality irrigation water c. Leaching of salts below root zone d. All of these

Last Answer : d. All of these

Pick out the wrong statement. (A) Polymeric fibres are never produced by addition polymerisation (B) Property of tackiness is exhibited by uncured rubber (C) Sharp melting point is not observed in thermoplastic polymers (D) Polythene generally has an excellent resistance to ultra violet rays

Description : Pick out the wrong statement. (A) Polymeric fibres are never produced by addition polymerisation (B) Property of tackiness is exhibited by uncured rubber (C) Sharp melting point is not observed in thermoplastic polymers (D) Polythene generally has an excellent resistance to ultra violet rays

Last Answer : (A) Polymeric fibres are never produced by addition polymerisation

Slugging in a fluidised bed can be avoided by using (A) Tall narrow vessel (B) Deep bed of solids (C) Shallow beds of solids and proper choice of particle size (D) Very large particles

Description : Slugging in a fluidised bed can be avoided by using (A) Tall narrow vessel (B) Deep bed of solids (C) Shallow beds of solids and proper choice of particle size (D) Very large particles

Last Answer : (C) Shallow beds of solids and proper choice of particle size

Slugging occurs in a fluidised bed, if the bed is (A) Narrow (B) Deep (C) Both (A) & (B) (D) Neither (A) nor (B)

Description : Slugging occurs in a fluidised bed, if the bed is (A) Narrow (B) Deep (C) Both (A) & (B) (D) Neither (A) nor (B)

Last Answer : (C) Both (A) & (B)

List the steps involved in slugging process

Description : List the steps involved in slugging process

Last Answer : i) Sieving ii) Weighing iii) Blending iv) Slugging v) Screening vi) Blending vii) Compression Or. Drug + Excipients → Blending → Slugging(formation of big size tablet) → Screening → Blending → Compression.

The metallurgical process in which a metal is obtained in a fused state is called - (1) roasting (2) calcinations (3) smelting (4) froth floatation

Description : The metallurgical process in which a metal is obtained in a fused state is called - (1) roasting (2) calcinations (3) smelting (4) froth floatation

Last Answer : (3) smelting Explanation: The metallurgical process in which a metal is obtained in a fused state is called smelting.

Concentration of sulphide ores is done usually by (A) Roasting (B) Smelting (C) Froth floatation (D) Electromagnetic separation

Description : Concentration of sulphide ores is done usually by (A) Roasting (B) Smelting (C) Froth floatation (D) Electromagnetic separation

Last Answer : (C) Froth floatation

Van Arkel method of purification of metals involves converting the metal to

Description : Van Arkel method of purification of metals involves converting the metal to

Last Answer : Van Arkel method of purification of metals involves converting the metal to A. Volatile ... stable compound D. non-volatile unstable compound

Van Arkel method of purification of metals involves converting the metal to

Description : Van Arkel method of purification of metals involves converting the metal to

Last Answer : Van Arkel method of purification of metals involves converting the metal to A. Volatile stable ... . Volatile unstable compound D. None of these

In which of the following method of purification metal is converted to its volatile compound which is decomposed to give pure metal?

Description : In which of the following method of purification metal is converted to its volatile compound which is decomposed to give pure metal?

Last Answer : In which of the following method of purification metal is converted to its volatile compound ... Heating with iodine C. Liquidation D. Distillation

If a metal has low oxygen affinity then the purification of metal may be carried out by :

Description : If a metal has low oxygen affinity then the purification of metal may be carried out by :

Last Answer : If a metal has low oxygen affinity then the purification of metal may be carried out by : A. liquation B. distillation C. zone refining D. cupellation

If the impurity in a metal has a greater affinity for oxygen and is more easily oxidised than the metal, then the purification of metal may be carried

Description : If the impurity in a metal has a greater affinity for oxygen and is more easily oxidised than the metal, then the purification of metal may be carried

Last Answer : If the impurity in a metal has a greater affinity for oxygen and is more easily oxidised than ... B. electrorefining C. Zone refining D. POILING

Statement-1: Extraction of gold from its native ore involves leaching the metal wih dilute solution of NaCN in presence of air. Statement-2:This is an

Description : Statement-1: Extraction of gold from its native ore involves leaching the metal wih dilute solution of NaCN in presence of air. Statement-2:This is an

Last Answer : Statement-1: Extraction of gold from its native ore involves leaching the metal wih dilute solution of ... -1 is false but Statement -2 is true

The metal extracted by leaching with cyanide is

Description : The metal extracted by leaching with cyanide is

Last Answer : The metal extracted by leaching with cyanide is A. Mg B. Ag C. Cu D. Na

Extraction of gold and silver involves leaching the metal with `CN^(-)` ion. The metal is recovered by _______

Description : Extraction of gold and silver involves leaching the metal with `CN^(-)` ion. The metal is recovered by _______

Last Answer : Extraction of gold and silver involves leaching the metal with `CN^(-)` ion. The metal ... by roasting D. thermal decomposition of metal complex

Disposal to sewage in large cities, is done in A. Irrigation B. Dilution C. Oxidation D. Purification

Description : Disposal to sewage in large cities, is done in A. Irrigation B. Dilution C. Oxidation D. Purification

Last Answer : ANS: B

Purification of copper is done by –

Description : Purification of copper is done by –

Last Answer : E l e c t r o l y t i c decomposition

Purification of copper is done by

Description : Purification of copper is done by

Last Answer : E l e c t r o l y t i c decomposition

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

Leaching of sugar from sugar beets is done by (A) Hot water (B) Hexane (C) Dilute H2SO4 (D) Lime water

Description : Leaching of sugar from sugar beets is done by (A) Hot water (B) Hexane (C) Dilute H2SO4 (D) Lime water

Last Answer : (A) Hot water

Leaching of coffee from coffee beans is done by (A) Hot water (B) Hexane (C) Lime water (D) Dilute H2SO4 (hot)

Description : Leaching of coffee from coffee beans is done by (A) Hot water (B) Hexane (C) Lime water (D) Dilute H2SO4 (hot)

Last Answer : (A) Hot water

Extraction of coffee from its seed is done by (A) Liquid-liquid extraction (B) Leaching (C) Extractive distillation (D) Steam distillation

Description : Extraction of coffee from its seed is done by (A) Liquid-liquid extraction (B) Leaching (C) Extractive distillation (D) Steam distillation

Last Answer : (B) Leaching

Separation of the isotopes of helium for scientific investigations is done by (A) Reverse osmosis (B) Thermal diffusion (C) Leaching (D) Solvent extraction

Description : Separation of the isotopes of helium for scientific investigations is done by (A) Reverse osmosis (B) Thermal diffusion (C) Leaching (D) Solvent extraction

Last Answer : (B) Thermal diffusion

Leaching of uranium ore and gold ore is done in (A) Centrifugal extractor (B) Pachuca tanks

Description : Leaching of uranium ore and gold ore is done in (A) Centrifugal extractor (B) Pachuca tanks

Last Answer : (B) Pachuca tanks

Puddling is done to achieve : a. Soft soil bed b. Non leaching of water c. Size reduction of clods d. Conservation of moisture

Description : Puddling is done to achieve : a. Soft soil bed b. Non leaching of water c. Size reduction of clods d. Conservation of moisture

Last Answer : b. Non leaching of water

In the earths interior which zone has a temperature higher than its melting point?

Description : In the earths interior which zone has a temperature higher than its melting point?

Last Answer : Need answer

In melting gold, which part of flame willl you use, A. Reduced zone B. Oxidizing zone

Description : In melting gold, which part of flame willl you use, A. Reduced zone B. Oxidizing zone

Last Answer : A. Reduced zone

Mention the methods of obtaining ultra pure metal.

Description : Mention the methods of obtaining ultra pure metal.

Last Answer : a) Fractional crystallization or zone refining. b) Vacuum melting c) Distillation d) Chemical vapour deposition e) Liquation process

In arc welding, Argon is used because of its - (1) Low reactivity with metal (2) Ability to lower the melting point of the metal (3) High flammability (4) High calorific value

Description : In arc welding, Argon is used because of its - (1) Low reactivity with metal (2) Ability to lower the melting point of the metal (3) High flammability (4) High calorific value

Last Answer : (1) Low reactivity with metal Explanation: In arc welding, Argon is used as a shielding gas because it is chemically inert and forms no compounds. At the high temperatures that welding requires, the ... to brittle welds and instability in the welding arc. So,argon and other inert gases are sprayed.

Which of the following metal has the lowest melting point? (1) Lead (2) Lithium (3) Potassium (4) Sodium

Description : Which of the following metal has the lowest melting point? (1) Lead (2) Lithium (3) Potassium (4) Sodium

Last Answer : (3) Potassium Explanation: Here, Potassium has the lowest melting point in the given options i.e. 63.5° C. Helium has the lowest melting point of -272.2° C.

In arc welding, Argon is used because of its (1) Low reactivity with metal (2) Ability to lower the melting point of the metal (3) High flammability (4) High calorific value

Description : In arc welding, Argon is used because of its (1) Low reactivity with metal (2) Ability to lower the melting point of the metal (3) High flammability (4) High calorific value

Last Answer :  Low reactivity with metal

Muddy water is treated with alum in purification process, it is termed as : (1) emulsification (2) absorption (3) adsorption (4) coagulation

Description : Muddy water is treated with alum in purification process, it is termed as : (1) emulsification (2) absorption (3) adsorption (4) coagulation

Last Answer : (4) coagulation Explanation: Natural and wastewater contain small particulates that are suspended in water forming a colloid. These particles carry the same charges, and repulsion prevents them from combining into larger particulates to settle.

A liquid with high boiling point decomposes on simple distillation but it can be steam distilled for its purification .Explain how is it possible?

Description : A liquid with high boiling point decomposes on simple distillation but it can be steam distilled for its purification .Explain how is it possible?

Last Answer : In steam distillation boiling occurs when vapour pressure of organic compound & steam becomes equal to atmospheric pressure. As vapour pressure of water is higher than the organic liquid. ... organic liquid vaporizes at a temperature below its boiling point in steam distillation without decomposing.

Dialysis is a method of purification of sols. But prolonged dialysis of the sol makes it unstable. Why ?

Description : Dialysis is a method of purification of sols. But prolonged dialysis of the sol makes it unstable. Why ?

Last Answer : Ans. Traces of electrolytes in the sol, impart charge to dispersed phase particles making it stable. Prolonged dialysis removes all electrolytes thus making the sol unstable.

Muddy water is treated with alum in purification process, itis termed as : (1) emulsification (2)absorption (3) adsorption (4) coagulation

Description : Muddy water is treated with alum in purification process, itis termed as : (1) emulsification (2)absorption (3) adsorption (4) coagulation

Last Answer : coagulation

Can an ultra sound be done on the side of your face near your ear?

Description : Can an ultra sound be done on the side of your face near your ear?

Last Answer : As this article shows, ultrasound of the face and head can be done.

Separation of isotopes is generally done using a/an __________ centrifuge. (A) Ultra (B) Disk-bowl (C) Both (A) & (B) (D) Neither (A) nor (B)

Description : Separation of isotopes is generally done using a/an __________ centrifuge. (A) Ultra (B) Disk-bowl (C) Both (A) & (B) (D) Neither (A) nor (B)

Last Answer : (A) Ultra

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

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

Last Answer : (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.

Can you name some videos on Gold and Silver finding, smelting, and buying?

Description : Can you name some videos on Gold and Silver finding, smelting, and buying?

Last Answer : I have no idea personally but have you tried Ebay?

Where can one get the extensive knowledge needed for gold smelting and assaying?

Description : Where can one get the extensive knowledge needed for gold smelting and assaying?

Last Answer : answer:There are certainly books. A Bing search for the following string: gold smelting returns results on online information as well as books. Unfortunately, it's gotten to where searching on Google ... fascinating project and if you're able to follow through, can lead to a lucrative career.