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

How many of the following statement is /are ture for calcination of metal ore ?
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How many of the following statement is /are ture for calcination of metal ore ? A. (i) It makes ... of crystlliation D. Impurities of S,As and Sb are
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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.

Sulphur removal by heating of pyrite ore in presence of air is called its (A) Reduction (B) Roasting (C) Calcination (D) Smelting

Description : Sulphur removal by heating of pyrite ore in presence of air is called its (A) Reduction (B) Roasting (C) Calcination (D) Smelting

Last Answer : (B) Roasting

If the iron ore contains clay as an impurity, the flux added during calcination, is (A) Clay (B) Lime stone (C) Argillaceous iron ore (D) All the above

Description : If the iron ore contains clay as an impurity, the flux added during calcination, is (A) Clay (B) Lime stone (C) Argillaceous iron ore (D) All the above

Last Answer : 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 : Calcination

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

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

Last Answer : In extraction of metal how many of the following ores calcination process is involved . (i) Dolomite ... Siderite (viii) Iron pyrite (ix) Ar gentite

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.

The square of a prime number is always prime is the give statement ture?

Description : The square of a prime number is always prime is the give statement ture?

Last Answer : The square of a prime number is always prime is the give statement ture?

Pick up the correct statement from the following: (A) The heating of a material to redness in contact with air, is known as calcination (B) The property of lime by which it sets or hardens in damp places having no free circulation of air is called setting (C) The product that remains after calcination of limestone, is called lime (D) All the above

Description : Pick up the correct statement from the following: (A) The heating of a material to redness in contact with air, is known as calcination (B) The property of lime by which it sets or hardens in ... (C) The product that remains after calcination of limestone, is called lime (D) All the above

Last Answer : Answer: Option D

hibiscus tree/ leaves ture yellow and falling

Description : hibiscus tree/ leaves ture yellow and falling

Last Answer : Need Answer

What is wrong when the leaves of a (potted) fig tree start to ture yellow and fall off?

Description : What is wrong when the leaves of a (potted) fig tree start to ture yellow and fall off?

Last Answer : check for tiny bugs under the good leaves.........after the sun goes down mix up 1 teasp of liquid hand soap w 1 qt water & spray on top & under the leaves...............in the late ... dead leaves away in a bag and trash them. This crazy weather pattern this year is very hard on all the plants.

Which of the following is/are not ture?

Description : Which of the following is/are not ture?

Last Answer : Which of the following is/are not ture? A. The most radioactive element present in pitchblende is ... changes the mass number but not atomic number.

Pick up the correct match . `{:((a)" False ribs " (i) 1^(st)" to " 7^(th) " pair "),((b)" Ture ribs " (ii) 11^(th) and 12^(th) "pair "),((c)" Floating

Description : Pick up the correct match . `{:((a)" False ribs " (i) 1^(st)" to " 7^(th) " pair "),((b)" Ture ribs " (ii) 11^(th) and 12^(th) "pair "),((c)" Floating

Last Answer : Pick up the correct match . `{:((a)" False ribs " (i) 1^(st)" to " 7^(th) " pair "),((b)" Ture ribs " (ii ... c-ii, d-iv` D. `a-iii, b-i, c-ii, d-iv`

Which is ture about decay constant `(lambda)`?

Description : Which is ture about decay constant `(lambda)`?

Last Answer : Which is ture about decay constant `(lambda)`? A. Unit is `"time"^(-1)` B. value of `lambda` ... time to the total no. of atoms present at the time.

Which of the following statements about the striated muscles is ture ? In the centre of each I-Band is an elastic fiber(Z-line ) which bisects it M-li

Description : Which of the following statements about the striated muscles is ture ? In the centre of each I-Band is an elastic fiber(Z-line ) which bisects it M-li

Last Answer : Which of the following statements about the striated muscles is ture ? In the centre of each I-Band is an elastic ... C. `i and iii` D. `i and ii`

Ture or false streams lose velocity when they join larger streams?

Description : Ture or false streams lose velocity when they join larger streams?

Last Answer : ture

Ture or false streams lose velocity when they join larger streams?

Description : Ture or false streams lose velocity when they join larger streams?

Last Answer : ture

The heat required to raise the tempera- ture of body by 1 K is called?

Description : The heat required to raise the tempera- ture of body by 1 K is called?

Last Answer : thermal capacity

The only gas which shows alkaline in na- ture?

Description : The only gas which shows alkaline in na- ture?

Last Answer : Ammonia

Plants that grow under average tempera- ture and moisture are called?

Description : Plants that grow under average tempera- ture and moisture are called?

Last Answer : mesophytes

Java Servlet i) is key component of server side java development ii) is a small pluggable extension to a server that enhances functionality iii) runs only in Windows Operating System iv) allows developers to customize any java enabled server A) i, ii & iii are ture B) i, iii & iv are true C) ii, iii & iv are true D) i, ii & iv are true

Description : Java Servlet i) is key component of server side java development ii) is a small pluggable extension to a server that enhances functionality iii) runs only in Windows Operating System iv) allows developers to customize any java ... & iv are true C) ii, iii & iv are true D) i, ii & iv are true

Last Answer : D) i, ii & iv are true

Which of the following statements related to Contribution Analysis are ture? A. If contribution is zero, there is loss equal to fixed costs B. If contribution is negative, loss is less than fixed costs C. If contribution is positive and more than fixed cost there will be profit. D. All of the above

Description : Which of the following statements related to Contribution Analysis are ture? A. If contribution is zero, there is loss equal to fixed costs B. If contribution is negative, loss is less than fixed costs ... contribution is positive and more than fixed cost there will be profit. D. All of the above

Last Answer : A. If contribution is zero, there is loss equal to fixed costs

In D.C. machines, ir order to prevent excessive distortion of field form by the armature reaction, the field mmf must be made (a) equal to that of armature mmf (b) less in comparison with the arma¬ture mmf (c) large in comparison with the arma-ture mmf (d) none of the above

Description : In D.C. machines, ir order to prevent excessive distortion of field form by the armature reaction, the field mmf must be made (a) equal to that of armature mmf (b) less in comparison with the arma¬ture mmf (c) large in comparison with the arma-ture mmf (d) none of the above

Last Answer : (c) large in comparison with the arma-ture mmf

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

To which of the following ores , calcination process is not applicable

Description : To which of the following ores , calcination process is not applicable

Last Answer : To which of the following ores , calcination process is not applicable A. Zns B. `Al_(2)O_(3)2H_(2)O` C. `CuCO_(3).Cu(OH)_(2)` D. `CaCO_(3)`

Which of the following reaction occur during calcination ?

Description : Which of the following reaction occur during calcination ?

Last Answer : Which of the following reaction occur during calcination ? A. `CaCO_(3)toCaO+CO_(2)` B. `2FeS_(2)+(11)/(2)O_(2 ... ` D. `ZnS+(3)/(2)O_(2)toZnO+SO_(2)`

What do you mean by calcination?

Description : What do you mean by calcination?

Last Answer : Heating in the absence of ai

What do you mean by calcination?

Description : What do you mean by calcination?

Last Answer : Coating iron with Zinc

Calcination of limestone to produce lime is done in a __________ kiln. (A) Tunnel (B) Rotary (C) Vertical shaft (D) Both (B) and (C)

Description : Calcination of limestone to produce lime is done in a __________ kiln. (A) Tunnel (B) Rotary (C) Vertical shaft (D) Both (B) and (C)

Last Answer : (D) Both (B) and (C)

Thermal efficiency of a limestone calcination rotary kiln may be around __________ percent. (A) 20 (B) 40 (C) 65 (D) 80

Description : Thermal efficiency of a limestone calcination rotary kiln may be around __________ percent. (A) 20 (B) 40 (C) 65 (D) 80

Last Answer : (B) 40

Rotary kilns are used in the (A) Calcination of limestone & dolomite (B) Cement manufacture (C) Both (A) and (B) (D) Neither (A) nor (B)

Description : Rotary kilns are used in the (A) Calcination of limestone & dolomite (B) Cement manufacture (C) Both (A) and (B) (D) Neither (A) nor (B)

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

Reducing atmosphere is maintained in a (A) Calcination kiln (B) Blast furnace (C) Soaking pit (D) L.D. converter

Description : Reducing atmosphere is maintained in a (A) Calcination kiln (B) Blast furnace (C) Soaking pit (D) L.D. converter

Last Answer : (B) Blast furnace

Which of the following is not a directly fired furnace? (A) By-product coke oven (B) Calcination kiln (C) Sintering furnace (D) Open hearth furnace

Description : Which of the following is not a directly fired furnace? (A) By-product coke oven (B) Calcination kiln (C) Sintering furnace (D) Open hearth furnace

Last Answer : (A) By-product coke oven

Which of the following is used for calcination of limestone and dolomite in industrial practice? (A) Fluidised bed reactor (B) Moving bed reactor (C) Fixed bed reactor (D) None of these

Description : Which of the following is used for calcination of limestone and dolomite in industrial practice? (A) Fluidised bed reactor (B) Moving bed reactor (C) Fixed bed reactor (D) None of these

Last Answer : (B) Moving bed reactor

Calcination reaction of limestone (CaCO3 → CaO + CO2 ) goes to completion in the rotary kiln, because (A) CaO is not dissociated (B) CO2 escapes continuously (C) Of high calcination temperature (D) CaO is more stable than CaCO3

Description : Calcination reaction of limestone (CaCO3 → CaO + CO2 ) goes to completion in the rotary kiln, because (A) CaO is not dissociated (B) CO2 escapes continuously (C) Of high calcination temperature (D) CaO is more stable than CaCO3

Last Answer : (B) CO2 escapes continuously

In case of calcination of limestone, CaCO3 CaO + CO2 , the addition of more of CaO will result in __________ in the concentration of CO2 . (A) No change (B) Increase (C) Decrease (D) Unpredictable from the data

Description : In case of calcination of limestone, CaCO3 CaO + CO2 , the addition of more of CaO will result in __________ in the concentration of CO2 . (A) No change (B) Increase (C) Decrease (D) Unpredictable from the data

Last Answer : (A) No change

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

Description : 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

Last Answer : (C) 1000°C

Calcination of gypsum produces (A) Plaster of Paris (B) Salt cake (C) Nitre cake (D) Lime

Description : Calcination of gypsum produces (A) Plaster of Paris (B) Salt cake (C) Nitre cake (D) Lime

Last Answer : (A) Plaster of Paris

Calcination of limestone is not done in a __________ kiln for producing lime. (A) Vertical shaft (B) Rotary (C) Fluidised bed (D) Fixed bed

Description : Calcination of limestone is not done in a __________ kiln for producing lime. (A) Vertical shaft (B) Rotary (C) Fluidised bed (D) Fixed bed

Last Answer : (D) Fixed bed

The operation of removal of impurities or clay adhering to iron ores, is known as (A) Dressing (B) Calcination (C) Roasting (D) Smelti

Description : The operation of removal of impurities or clay adhering to iron ores, is known as (A) Dressing (B) Calcination (C) Roasting (D) Smelti

Last Answer : Answer: Option A

Pig iron is manufactured from the ores by (A) Dressing (B) Calcination and roasting (C) Smelting (D) All the above

Description : Pig iron is manufactured from the ores by (A) Dressing (B) Calcination and roasting (C) Smelting (D) All the above

Last Answer : Answer: Option D

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

Description : 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 above

Last Answer : Answer: Option D

Calcination of iron ores is done (A) To remove moisture (B) To remove carbonic acid (C) By roasting in heaps (D) All the above

Description : Calcination of iron ores is done (A) To remove moisture (B) To remove carbonic acid (C) By roasting in heaps (D) All the above

Last Answer : Answer: Option D

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

Description : 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

Last Answer : Answer: Option B

Explain following unit process with example. (i) Reduction (ii) Calcination (iii) Nitration

Description : Explain following unit process with example. (i) Reduction (ii) Calcination (iii) Nitration

Last Answer : Reduction: Reduction is defined as the addition of hydrogen, removal of oxygen, addition of metallic element or addition of electrons. Eg. Reduction of ethyl bromide Nitrobenzene can be reduced ... Sulfuric acid and con. Nitric acid.  Nitrating mixture is used in nitration reaction.

Difference between Calcination and Roasting.

Description : Difference between Calcination and Roasting. 

Last Answer : Calcination Roasting 1)Process of heating the ore strongly in absence of air below its M.P 1)Process of heating the ore strongly in presence of air below its M.P. 2)This ... the doors are kept opened. 6. Decomposition reaction takes place 6.Oxidation reaction takes place

Name the ore from which aluminium is obtained. Why is aluminium considered to be an important metal? -Geography

Description : Name the ore from which aluminium is obtained. Why is aluminium considered to be an important metal? -Geography

Last Answer : Aluminium is obtained from the Bauxite Ore. There are many ores that contain aluminium but Bauxite is clay-like substance from which alumina and later aluminium are acquired. It is formed ... state in India and the most important Bauxite deposit are the Panchpatmali deposits in Koraput district.

10.(a) An ore on treatment with dilute hydrochloric acid produces brisk effervesces. What type of ore is this? What steps will be required to obtain metal from the enriched ore. , (b) Copper coin is kept immersed in silver nitrate solution for some time. What change will take place in coin and colour of the solution ? Write balanced chemical equation of the reaction involved. -Chemistry

Description : 10.(a) An ore on treatment with dilute hydrochloric acid produces brisk effervesces. What type of ore is this? What steps will be required to obtain metal from the enriched ore. , (b) ... in coin and colour of the solution ? Write balanced chemical equation of the reaction involved. -Chemistry

Last Answer : (a) Carbonate ore: (i) Calcination: Carbonate ore is heated in limited supply of air and oxide is obtained, e.g. (b) Copper, being more reactive than silver will displace silver from silver nitrate ... and there will be deposition of silver on copper coin. The colour of solution will turn to blue.

Cinebara is the ore of which metal? -General Knowledge

Description : Cinebara is the ore of which metal? -General Knowledge

Last Answer : Cinnabar is an ore of metal X.It exists in the lower order of the reactivity series.Here the metal X is mercury. Mercury is extracted by froth flotation method. HgS + O2 = Hg+ SO2 riddhi324221

Which of the following is an example of a solution Iron metal, iron ore, iron alloy, iron rust?

Description : Which of the following is an example of a solution Iron metal, iron ore, iron alloy, iron rust?

Last Answer : An iron alloy(Explanation): Iron metal is a pure substance, so it cannot be a solution, so it's not that one. An iron ore is found in nature and is iron chemically combined with other substances, so ... where you heat the metal to a liquid and mix in other metals like zinc to make pennies and stuff)

What is metal ore ?

Description : What is metal ore ?

Last Answer : A mineral that can be easily extracted is called ore.