Crystalline silicon is obtained by reducing

Crystalline silicon is obtained by reducing
by

1 Answer

Answer :

silica with coke.
by

Related questions

Compare the properties of amorphous and crystalline silicon

Description : Compare the properties of amorphous and crystalline silicon

Last Answer : morphous silicon It is a brown powder It does not conduct electricity at low temperatures. It is more reactive than crystalline silicon When heated in air, it oxidizes at the surface level ... electricity It is less reactive than amorphous silicon It does not burn in air even when heated

How is crystalline silicon prepared?

Description : How is crystalline silicon prepared?

Last Answer : Crystalline silicon is prepared by reducing silica with coke. When excess of silica is heated with coke in an electric furnace in the absence of air, dark grey coloured silicon in its crystalline form is obtained. SiO 2 + 2C Heat Si + 2CO

Amorphous silicon is obtained by heating silica with

Description : Amorphous silicon is obtained by heating silica with

Last Answer : magnesium powder.

Which of the Following conference obtained commitments from different countries for reducing overall greenhouse gas emission at a level 5% below 1990

Description : Which of the Following conference obtained commitments from different countries for reducing overall greenhouse gas emission at a level 5% below 1990

Last Answer : Which of the Following conference obtained commitments from different countries for reducing overall ... , 1987 D. Helsinki Declaration, 1989

.......................... models are obtained by enlarging or reducing the size of the items. a. Iconic models b. Analogue models c. Symbolic models d. None of these

Description : .......................... models are obtained by enlarging or reducing the size of the items. a. Iconic models b. Analogue models c. Symbolic models d. None of these

Last Answer : a. Iconic models

Charcoal is (a) Amorphous (b) Crystalline (c) Hygroscopic (d) None of these

Description : Charcoal is (a) Amorphous (b) Crystalline (c) Hygroscopic (d) None of these

Last Answer : Ans:(a)

Diamond is the form of carbon that is (a) Crystalline (b) Amorphous (c) Chemical (d) Alkaline

Description : Diamond is the form of carbon that is (a) Crystalline (b) Amorphous (c) Chemical (d) Alkaline

Last Answer : Ans:(a)

The crystalline forms of carbon are

Description : The crystalline forms of carbon are

Last Answer : diamond and graphite.

Why is diamond hard whereas graphite soft even through both are crystalline forms of carbon?

Description : Why is diamond hard whereas graphite soft even through both are crystalline forms of carbon?

Last Answer : The reason for difference is because of arrangement of carbon atoms.

Why is diamond hard whereas graphite soft even through both are crystalline forms of carbon?

Description : Why is diamond hard whereas graphite soft even through both are crystalline forms of carbon?

Last Answer : The reason for difference is because of arrangement of carbon atoms.

All of the following substances are crystalline except-------? A. Ice B. Diamond C. Sucrose D. Plastic (Answer)

Description : All of the following substances are crystalline except-------? A. Ice B. Diamond C. Sucrose D. Plastic (Answer)

Last Answer : D. Plastic (Answer)

In what three components of Earth's makeup must we find the total mass of crystalline rock components that were eroded from the primary crystalline rocks of earth's surface?

Description : In what three components of Earth's makeup must we find the total mass of crystalline rock components that were eroded from the primary crystalline rocks of earth's surface?

Last Answer : answer:What are the components of Earth’s makeup? How many are there? Wouldn’t it be the components nearest the surface (e.g., crust, lithosphere, asthenosphere)? Keep in mind, I have no idea what I’m talking about.

The Peninsular plateau is a tableland composed of the old crystalline, igneous and metamorphic rocks. What do CRYSTALLINE ROCKES mean here? -Geography

Description : The Peninsular plateau is a tableland composed of the old crystalline, igneous and metamorphic rocks. What do CRYSTALLINE ROCKES mean here? -Geography

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Which is a part of the eye that helps in changing the focal length of crystalline lensis? -Do You Know?

Description : Which is a part of the eye that helps in changing the focal length of crystalline lensis? -Do You Know?

Last Answer : answer:

What is the composition of crystalline water in blue vitriol ?

Description : What is the composition of crystalline water in blue vitriol ?

Last Answer : : Blue vitriol's crystal water content is 36.06%.

A yellow coloured crystalline substance gave a colourless gas `X` on reaction with fluorine, which is thermally stable and has octahedral geometry. `X

Description : A yellow coloured crystalline substance gave a colourless gas `X` on reaction with fluorine, which is thermally stable and has octahedral geometry. `X

Last Answer : A yellow coloured crystalline substance gave a colourless gas `X` on reaction with fluorine, which is ... and has octahedral geometry. `X` can be

A yellow coloured crystalline substance gave a colourless gas `X` on reaction with fluorine, which is thermally stable and has octahedral geometry. `X

Description : A yellow coloured crystalline substance gave a colourless gas `X` on reaction with fluorine, which is thermally stable and has octahedral geometry. `X

Last Answer : A yellow coloured crystalline substance gave a colourless gas `X` on reaction with fluorine, which is thermally stable ... `SF_(2)` D. `S_(2)F_(6)`

A yellow coloured crystalline substance gave a colourless gas `X` on reaction with fluorine, which is thermally stable and has octahedral geometry. `X

Description : A yellow coloured crystalline substance gave a colourless gas `X` on reaction with fluorine, which is thermally stable and has octahedral geometry. `X

Last Answer : A yellow coloured crystalline substance gave a colourless gas `X` on reaction with fluorine, which is ... and has octahedral geometry. `X` can be

A yellow coloured crystalline substance gave a colourless gas `X` on reaction with fluorine, which is thermally stable and has octahedral geometry. `X

Description : A yellow coloured crystalline substance gave a colourless gas `X` on reaction with fluorine, which is thermally stable and has octahedral geometry. `X

Last Answer : A yellow coloured crystalline substance gave a colourless gas `X` on reaction with fluorine, which is thermally stable ... `SF_(2)` D. `S_(2)F_(6)`

White crystalline solid (A) reacts with `H_2` to form a highly associated liquid (B) and a monoatomic , colourless gas (C ). The liquid (B) is used fo

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White crystalline solid (A) reacts with `H_2` to form a highly associated liquid (B) and a monoatomic , colourless gas (C ). The liquid (B) is used fo

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Last Answer : White crystalline solid (A) reacts with `H_2` to form a highly associated liquid (B) and a ... metallic bonds D. ionic, covalent and Hydrogen bonds

White crystalline solid (A) reacts with `H_2` to form a highly associated liquid (B) and a monoatomic , colourless gas (C ). The liquid (B) is used fo

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Last Answer : White crystalline solid (A) reacts with `H_2` to form a highly associated liquid (B) and a monoatomic , colourless gas ... 3)d` D. V - shape, `sp^(3)`

A crystalline solid X reacts with dilute HCl to liberate a gas Y. The gas Y decolourises acidified `KMnO_(4)`. When a gas Z is slowly passed into aque

Description : A crystalline solid X reacts with dilute HCl to liberate a gas Y. The gas Y decolourises acidified `KMnO_(4)`. When a gas Z is slowly passed into aque

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Crystalline form of Sulphur is

Description : Crystalline form of Sulphur is

Last Answer : Crystalline form of Sulphur is A. Plastic sulphur B. Colloidal sulphur C. Monoclinic sulphur D. All of these

What happens when crystalline Na2CO3 is heated ?

Description : What happens when crystalline Na2CO3 is heated ?

Last Answer : What happens when crystalline Na2CO3 is heated ? a. releases CO2 b. loses H2O c. decomposes into NaHCO3 d. colour changes.

What naturally occurring inorganic crystalline solid is a?

Description : What naturally occurring inorganic crystalline solid is a?

Last Answer : a mineral

Is a marshmallow a crystalline solid?

Description : Is a marshmallow a crystalline solid?

Last Answer : Marshmallows are amorphous solids.

The Himalayan region is poor in mineral resources because (a) it is made up of crystalline rocks (b) displacement of rock strata has disturbed the arrangement of rocks and made it complex (c) the climatic conditions are not suitable for exploitation of minerals (d) the terrain makes exploitation of minerals difficult and very costly due to transport difficulties

Description : The Himalayan region is poor in mineral resources because (a) it is made up of crystalline rocks (b) displacement of rock strata has disturbed the arrangement of rocks and made it ... minerals (d) the terrain makes exploitation of minerals difficult and very costly due to transport difficulties

Last Answer : Ans: (b)

The Himalayan region is poor in mineral resources because: [IAS 2004] (a) it is made of crystalline rocks (b) the displacement of rock strata has disturbed the arrangement of rock and made it complex (c) the climatic conditions are not suitable for exploitation of minerals (d) the terrain makes exploitation of minerals difficult and very costly due to transport difficulties

Description : The Himalayan region is poor in mineral resources because: [IAS 2004] (a) it is made of crystalline rocks (b) the displacement of rock strata has disturbed the arrangement of rock and ... minerals (d) the terrain makes exploitation of minerals difficult and very costly due to transport difficulties

Last Answer : Ans: (b)

Which of the following is/are not the characteristics of red soils? 1. They are derived from weathering of old crystalline and metamorphic rocks 2. They contain iron oxides 3. They have high water retention capacity 4. They have high nitrogen content (a) II and III (b) Only III (c) Only IV (d) III and IV

Description : Which of the following is/are not the characteristics of red soils? 1. They are derived from weathering of old crystalline and metamorphic rocks 2. They contain iron oxides 3. They have high water retention capacity 4. They ... nitrogen content (a) II and III (b) Only III (c) Only IV (d) III and IV

Last Answer : Ans: (d)

The Red soils develop a reddish colour due to: (a) deforestation and over-grazing (b) the presence of potash and magnesia (c) tropical monsoonal climate (d) a wide diffusion of iron in ancient crystalline and metamorphic Jacks

Description : The Red soils develop a reddish colour due to: (a) deforestation and over-grazing (b) the presence of potash and magnesia (c) tropical monsoonal climate (d) a wide diffusion of iron in ancient crystalline and metamorphic Jacks

Last Answer : Ans: (d)

Why is it that the Himalayan region is poor in mineral resources? (a) Displacement of rock strata has disturbed the arrangement of rocks and made it complex (b) It is made up of crystalline rock (c) the terrain makes exploitation of minerals difficult (d) The climatic conditions are not suitable, for exploitation of minerals

Description : Why is it that the Himalayan region is poor in mineral resources? (a) Displacement of rock strata has disturbed the arrangement of rocks and made it complex (b) It is made up of ... makes exploitation of minerals difficult (d) The climatic conditions are not suitable, for exploitation of minerals

Last Answer : Ans: (a)

In the genetic disorder of cystinuria, the patient excretes large quantities of cystine in their urine and its low solubility causes crystalline cystine to precipitate as stones in kidneys. The remedy involves ingesting Na HCO3. Reaction of this treatment is (A) NaHCO2 combines with cystine (B) NaHCO3 raises the pH above the isoelectric point of cystine (C) NaHCO3 prevents stone formation by hydrolysis of cystine to cysteine (D) None of these

Description : In the genetic disorder of cystinuria, the patient excretes large quantities of cystine in their urine and its low solubility causes crystalline cystine to precipitate as stones in kidneys. The remedy ... C) NaHCO3 prevents stone formation by hydrolysis of cystine to cysteine (D) None of these

Last Answer : Answer : C

Diamond does not conduct electricity, because - (1) It's structure is very compact (2) It is of crystalline nature (3) There are only carbon atoms present in it (4) No free electrons are present in it

Description : Diamond does not conduct electricity, because - (1) It's structure is very compact (2) It is of crystalline nature (3) There are only carbon atoms present in it (4) No free electrons are present in it

Last Answer : (4) No free electrons are present in it Explanation: Diamond has a giant molecular structure. Each carbon atom is covalently bonded to four other car-bon atoms. There are no ... conduct electricity. Except for most blue diamonds, which are semiconductors, diamonds are good electrical insulators.

(4) Decomposition of manganese dioxide Explanation: One of the two chemical methods starts from natural manganese dioxide and converts it using dinitrogen tetroxide and water to manganese nitrate solution. Evaporation of the water leaves the crystalline nitrate salt. At temperatures of 400°C, the salt decomposes, releasing N2O4 and leaving a residue of purified manganese dioxide.

Description : (4) Decomposition of manganese dioxide Explanation: One of the two chemical methods starts from natural manganese dioxide and converts it using dinitrogen tetroxide and water to manganese nitrate ... 400°C, the salt decomposes, releasing N2O4 and leaving a residue of purified manganese dioxide.

Last Answer : The mass number of a nucleus is - (1) always less than its atomic number (2) the sum of the number of protons and neutrons present in the nucleus (3) always more than the atomic weight (4) a fraction

Diamond is the form of carbon that is - (1) Crystalline (2) Amorphous (3) Chemical (4) Alkaline

Description : Diamond is the form of carbon that is - (1) Crystalline (2) Amorphous (3) Chemical (4) Alkaline

Last Answer : (1) Crystalline Explanation: Diamond is a solid form of the element carbon with its atoms arranged in a crystal structure called diamond cubic.

Glass is - (1) Super cooled liquid (2) Crystalline solid (3) Liquid crystal (4) None of these

Description : Glass is - (1) Super cooled liquid (2) Crystalline solid (3) Liquid crystal (4) None of these

Last Answer : (1) Super cooled liquid Explanation: Glass is sometimes called a Super cooled liquid because it does not form a crystalline structure, but instead forms an amorphous solid that allows molecules in the material to continue to move.

Diamond is harder than graphite because of – (1) difference in layers of atoms (2) tetrahedral structure of diamond (3) difference of crystalline structures (4) None of these

Description : Diamond is harder than graphite because of – (1) difference in layers of atoms (2) tetrahedral structure of diamond (3) difference of crystalline structures (4) None of these

Last Answer : (1) difference in layers of atoms Explanation: Diamond is harder than graphite because diamond has a more complex structure. Diamond's structure is like many pentagons connected together, each pentagon ... together in some way. Graphite's structure is very loose, with its bonds forming layers.

Quartz is a crystalline form of - (1) Alumina (2) Glass (3) Silica (4) Limestone

Description : Quartz is a crystalline form of - (1) Alumina (2) Glass (3) Silica (4) Limestone

Last Answer : (3) Silica Explanation: Quartz is made up of a continuous framework of SiO4 silicon-oxygen tetrahedra, with each oxygen being shared between two tetrahedra, giving an overall formula SiO2. Tridymite ... is a denser polymorph of quartz found in some meteorite impact sites and in metamorphic rocks.

Fullerene is a newly discovered crystalline carbon allotrope, contains–

Description : Fullerene is a newly discovered crystalline carbon allotrope, contains–

Last Answer : 60 C atoms

A quarter wavelength devices made of crystalline calcite that changes polarization in the optic fiber communication. A. Isolator B. Retarder C. Polarizer D. Filters

Description : A quarter wavelength devices made of crystalline calcite that changes polarization in the optic fiber communication. A. Isolator B. Retarder C. Polarizer D. Filters

Last Answer : B. Retarder

Most of the fibre forming polymers are crystalline in nature, one of the exceptions being __________ which is amorphous in nature. (A) Nylon (B) Polyacrylonitrile (C) Polypropylene (D) Polyester

Description : Most of the fibre forming polymers are crystalline in nature, one of the exceptions being __________ which is amorphous in nature. (A) Nylon (B) Polyacrylonitrile (C) Polypropylene (D) Polyester

Last Answer : (B) Polyacrylonitrile

Pick out the correct statement. (A) Plastics are good conductors of heat and electricity (B) All the polymers are highly crystalline in nature (C) Polymers can be vaporised by heating to a very high temperature (D) The liquid polymer becomes greasy, then waxy and finally solid on increasing the degree of polymerisation

Description : Pick out the correct statement. (A) Plastics are good conductors of heat and electricity (B) All the polymers are highly crystalline in nature (C) Polymers can be vaporised by heating to ... D) The liquid polymer becomes greasy, then waxy and finally solid on increasing the degree of polymerisation

Last Answer : (D) The liquid polymer becomes greasy, then waxy and finally solid on increasing the degree of polymerisation

. The physical state in which polymers exist is (A) Melts & rubber like state (B) Amorphous glassy state (C) Partially crystalline state (D) All (A), (B) and (C)

Description : . The physical state in which polymers exist is (A) Melts & rubber like state (B) Amorphous glassy state (C) Partially crystalline state (D) All (A), (B) and (C)

Last Answer : (D) All (A), (B) and (C)

The behaviour of visco-elastic material is time dependent. This behaviour is common in __________ materials. (A) Non-crystalline solid (B) Crystalline (C) Rubbery (D) Non-crystalline organic polymeric

Description : The behaviour of visco-elastic material is time dependent. This behaviour is common in __________ materials. (A) Non-crystalline solid (B) Crystalline (C) Rubbery (D) Non-crystalline organic polymeric

Last Answer : (D) Non-crystalline organic polymeric

Common house hold glass (i.e., soda-lime glass) is a/an __________ material. (A) Fully crystalline (B) Partly crystalline (C) Amorphous

Description : Common house hold glass (i.e., soda-lime glass) is a/an __________ material. (A) Fully crystalline (B) Partly crystalline (C) Amorphous

Last Answer : (B) Partly crystalline

Visco-elastic behaviour of materials which is time dependent is common in (A) Plastics (B) Crystalline solid (C) Non-crystalline solids (D) Non-crystalline organic polymer

Description : Visco-elastic behaviour of materials which is time dependent is common in (A) Plastics (B) Crystalline solid (C) Non-crystalline solids (D) Non-crystalline organic polymer

Last Answer : (D) Non-crystalline organic polymer

Combination of metals and ceramics are called (A) Metalloy (B) Cermets (C) Pellets (D) Non-crystalline ceramics

Description : Combination of metals and ceramics are called (A) Metalloy (B) Cermets (C) Pellets (D) Non-crystalline ceramics

Last Answer : (B) Cermets

For continuous drying of granular or crystalline material, the dryer used is the __________ dryer.(A) Tunnel (B) Tray (C) Rotary (D) None of these

Description : For continuous drying of granular or crystalline material, the dryer used is the __________ dryer. (A) Tunnel (B) Tray (C) Rotary (D) None of these

Last Answer : (C) Rotary

Write the three crystalline forms in which Boron exist.

Description : Write the three crystalline forms in which Boron exist.

Last Answer : Ans.a) Prismatic Borax (Na2B4O7.10H2O) b) Octahedral Borax (Na2B4O7.5H2O) c) Anhydrous Sodium tetra borate (Na2B4O7