Amorphous silicon is obtained by heating silica with

Amorphous silicon is obtained by heating silica with
by

1 Answer

Answer :

magnesium powder.
by

Related questions

During preparation of amorphous silicon, the product is washed with hydrofluoric acid to

Description : During preparation of amorphous silicon, the product is washed with hydrofluoric acid to

Last Answer : remove unreacted silica.

During preparation of amorphous silicon, product is washed with

Description : During preparation of amorphous silicon, product is washed with

Last Answer : dilute hydrochloric acid to dissolve magnesium oxide.

What happens when amorphous silicon is heated?

Description : What happens when amorphous silicon is heated?

Last Answer : When amorphous silicon is heated in air, it oxidizes at the surface level & catches fire.

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

What is the role of the following in the extraction of amorphous silicon? a) Hydrochloric acid b) hydrofluoric acid

Description : What is the role of the following in the extraction of amorphous silicon? a) Hydrochloric acid b) hydrofluoric acid

Last Answer : a) Hydrochloric acid is used to dissolve magnesium oxide b) Hydrofluoric acid is used to remove unreacted silica

Briefly explain the extraction of amorphous silicon.

Description : Briefly explain the extraction of amorphous silicon.

Last Answer : Finely powdered silica (sand or quartz) is mixed with magnesium powder and heated in a fire clay crucible. Magnesium oxide and silicon are formed

State the application of following materials : i) CRGO Silicon Steel ii) HRGO Silicon Steel iii) Amorphous metal iv) Bronze

Description : State the application of following materials : i) CRGO Silicon Steel ii) HRGO Silicon Steel iii) Amorphous metal iv) Bronze 

Last Answer : Applications of CRGO Silicon Steel: 1) Manufacturing distribution and power transformer cores. 2) Manufacturing cores of audio transformers, ballast transformers, specialty transformers. 3) Manufacturing cores ... used. 5) Cadmium bronze is used for making commutator segments and contact wires. 

On heating, a white amorphous inorganic compound becomes yellow and on cooling, turns white again. The salt may be

Description : On heating, a white amorphous inorganic compound becomes yellow and on cooling, turns white again. The salt may be

Last Answer : On heating, a white amorphous inorganic compound becomes yellow and on cooling, turns white again. The salt may be A. ... `ZnCO_(3)` D. `K_(2)CO_(3)`

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

Beehive coke ovens are made of __________ bricks.(A) Silica (B) Fireclay (C) Silicon carbide (D) Corundum

Description : Beehive coke ovens are made of __________ bricks. (A) Silica (B) Fireclay (C) Silicon carbide (D) Corundum

Last Answer : (A) Silica

In fiber optics, SCS stands for ∙ a. Suppressed-clad-silicon ∙ b. Silicon base-class-silica ∙ c. Silica-clad-silica ∙ d. Serial-clad-silicon

Description : In fiber optics, SCS stands for ∙ a. Suppressed-clad-silicon ∙ b. Silicon base-class-silica ∙ c. Silica-clad-silica ∙ d. Serial-clad-silicon

Last Answer : c. Silica-clad-silica

Which of the following substances undergoes chemical change on heating? (1) Sodium chloride (2) Silica (3) Lead nitrate (4) Platinum wire

Description : Which of the following substances undergoes chemical change on heating? (1) Sodium chloride (2) Silica (3) Lead nitrate (4) Platinum wire

Last Answer : (3) Lead nitrate Explanation: Lead nitrate on heating decomposes to lead monoxide, nitrogen dioxide and oxygen. NO2 is liberated, along with oxygen, as a reddish brown gas.

Which of the following substances undergoes chemical change on heating? (1) Sodium chloride (2) Silica (3) Lead nitrate (4) Platinum wire

Description : Which of the following substances undergoes chemical change on heating? (1) Sodium chloride (2) Silica (3) Lead nitrate (4) Platinum wire

Last Answer : (3) Lead nitrate Explanation: Lead nitrate on heating decomposes to lead monoxide, nitrogen dioxide and oxygen. NO2 is liberated, along with oxygen, as a reddish brown gas.

Height of coke oven is limited (say maximum upto 7 metres) mainly by the(A) Problem of uniform heating along its height(B) Structural strength of silica bricks(C) Problem in door cleaning(D) Buckling of ram of pusher car at the time of coke pushing

Description : Height of coke oven is limited (say maximum upto 7 metres) mainly by the (A) Problem of uniform heating along its height (B) Structural strength of silica bricks (C) Problem in door cleaning (D) Buckling of ram of pusher car at the time of coke pushing

Last Answer : (A) Problem of uniform heating along its height

This plant species gives off secretions called Tabasheer which are 97% silica. It is claimed that this is a cure for coughs, asthma and is also an aphrodisiac. It is also true that Tabasheer is chemically inert, but may catalyse some chemical reactions. Where is Tabasheer normally obtained from?

Description : This plant species gives off secretions called Tabasheer which are 97% silica. It is claimed that this is a cure for coughs, asthma and is also an aphrodisiac. It is also true that Tabasheer is chemically inert, but may catalyse some chemical reactions. Where is Tabasheer normally obtained from?

Last Answer : Bamboo.

Crystalline silicon is obtained by reducing

Description : Crystalline silicon is obtained by reducing

Last Answer : silica with coke.

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)

A ligament is (a) A fibrous tissue that joins the muscle to bone (b) A type of amorphous gel that cements non movable joints together (c) A type of fibrous connective tissue that joins bones together at joints (d) Only formed to repair damaged muscle tissue

Description : A ligament is (a) A fibrous tissue that joins the muscle to bone (b) A type of amorphous gel that cements non movable joints together (c) A type of fibrous connective tissue that joins bones together at joints (d) Only formed to repair damaged muscle tissue

Last Answer : Ans:(c)

Find incorrect statement with regard to centrosome and centrioles :- (a) Centrosomes are surrounded by amorphous pericentriolar material (b) In centro

Description : Find incorrect statement with regard to centrosome and centrioles :- (a) Centrosomes are surrounded by amorphous pericentriolar material (b) In centro

Last Answer : Find incorrect statement with regard to centrosome and centrioles :- (a) Centrosomes are surrounded by amorphous ... b C. b, c D. All are correct

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.

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

. 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)

Orlan fibre which is used as a wool substitute is (A) An amorphous polymer (B) A natural polymeric fibre (C) Polyacrylonitrile (D) Poly-methyl-methacrylate (PMMA)

Description : Orlan fibre which is used as a wool substitute is (A) An amorphous polymer (B) A natural polymeric fibre (C) Polyacrylonitrile (D) Poly-methyl-methacrylate (PMMA)

Last Answer : (C) Polyacrylonitrile

Ceramic materials are (A) Organic in nature (B) Stronger in compression than in tension (C) Always amorphous in nature (D) Always bad heat conductors

Description : Ceramic materials are (A) Organic in nature (B) Stronger in compression than in tension (C) Always amorphous in nature (D) Always bad heat conductors

Last Answer : (B) Stronger in compression than in tension

Which is an amorphous material? (A) Glass (B) Mica (C) Brass (D) Cast iron

Description : Which is an amorphous material? (A) Glass (B) Mica (C) Brass (D) Cast iron

Last Answer : (A) Glass

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

How can a material be made amorphous ?

Description : How can a material be made amorphous ? 

Last Answer : By melting the material and by cooling it rapidly.

With increase in temperature, the thermal conductivity of non-metallic amorphous solids (A) Decreases (B) Increases (C) Remain constant (D) First decreases upto certain temperature and then increases

Description : With increase in temperature, the thermal conductivity of non-metallic amorphous solids (A) Decreases (B) Increases (C) Remain constant (D) First decreases upto certain temperature and then increases

Last Answer : (B) Increases

Ordinary glass is not a/an (A) Amorphous isotropic material (B) Supercooled liquid (C) Material with sharp definite melting point (D) Electrical insulator

Description : Ordinary glass is not a/an (A) Amorphous isotropic material (B) Supercooled liquid (C) Material with sharp definite melting point (D) Electrical insulator

Last Answer : (C) Material with sharp definite melting point

While the thermosetting polymers are amorphous in nature, the thermoplastic polymers are either amorphous or crystalline. The crystalline polymers are characterised by the (A) Low impact strength (B) High flexibility (C) Better finish and surface appearance (D) High plastic deformation

Description : While the thermosetting polymers are amorphous in nature, the thermoplastic polymers are either amorphous or crystalline. The crystalline polymers are characterised by the (A) Low impact strength (B) High flexibility (C) Better finish and surface appearance (D) High plastic deformation

Last Answer : A) Low impact strength

Viscoelastic behaviour is observed in __________ materials. (A) Non-crystalline organic polymeric (B) Ceramic (C) All crystalline (D) All amorphous

Description : Viscoelastic behaviour is observed in __________ materials. (A) Non-crystalline organic polymeric (B) Ceramic (C) All crystalline (D) All amorphous

Last Answer : Non-crystalline organic polymeric

Wood is a/an __________ material. (A) Amorphous (B) Cellular (C) Homogeneous (D) Granular

Description : Wood is a/an __________ material. (A) Amorphous (B) Cellular (C) Homogeneous (D) Granular

Last Answer : (B) Cellular

In an amorphous material, atoms defy any definite atomic structure and exist in random pattern just like in liquid. Which of the following is an amorphous material? (A) Tin(B) Lead (C) Zinc (D) Glass

Description : In an amorphous material, atoms defy any definite atomic structure and exist in random pattern just like in liquid. Which of the following is an amorphous material? (A) Tin (B) Lead (C) Zinc (D) Glass

Last Answer : Option D

In calculus formation, the epitaxic concept is one of the theories. Which of the following is true: a. Mineralisation occurs when calcium and phosphate content is high. b. The presence of matrix would start initial formation of nucleus. c. The amorphous materials would convert to calcium phosphate and hydroxy phosphate.

Description : In calculus formation, the epitaxic concept is one of the theories. Which of the following is true: a. Mineralisation occurs when calcium and phosphate content is high. b. The presence of ... of nucleus. c. The amorphous materials would convert to calcium phosphate and hydroxy phosphate.

Last Answer : b. The presence of matrix would start initial formation of nucleus.

In calculus formation the epitaxic concept is one of the theories. Which of the following is true: A. Mineralisation occurs when calcium and phosphate content is high B. The presence of matrix would initiate the formation of the nucleus C. The amorphous materials would convert to calcium phosphate and hydroxy

Description : In calculus formation the epitaxic concept is one of the theories. Which of the following is true: A. Mineralisation occurs when calcium and phosphate content is high B. The presence of ... the formation of the nucleus C. The amorphous materials would convert to calcium phosphate and hydroxy

Last Answer : B. The presence of matrix would initiate the formation of the nucleus

A solid in which there is no regular arrangement of molecules is a) Amorphous b) Crystalline c) Copper d) None of above

Description : A solid in which there is no regular arrangement of molecules is a) Amorphous b) Crystalline c) Copper d) None of above

Last Answer : a) Amorphous

A solid is which atoms are in a regular order is called a) Crystalline solid b) Amorphous solid c) Polymeric solid d) Glassy solid

Description : A solid is which atoms are in a regular order is called a) Crystalline solid b) Amorphous solid c) Polymeric solid d) Glassy solid

Last Answer : a) Crystalline solid

If a material has the capacity to behave either as an acid or a base it is said to be: w) amorphous x) amphoteric y) anhydrous z) aklaline

Description : If a material has the capacity to behave either as an acid or a base it is said to be: w) amorphous x) amphoteric y) anhydrous z) aklaline

Last Answer : ANSWER: X -- AMPHOTERIC

For a substance, density, solubility and melting point are examples of: w) physical properties x) amorphous properties y) chemical properties z) potential properties

Description : For a substance, density, solubility and melting point are examples of: w) physical properties x) amorphous properties y) chemical properties z) potential properties

Last Answer : ANSWER: W -- PHYSICAL PROPERTIES

Which of the following substances is classified as amorphous? w) glass x) Zinc y) diamond z) sodium chloride

Description : Which of the following substances is classified as amorphous? w) glass x) Zinc y) diamond z) sodium chloride

Last Answer : ANSWER: W -- GLASS

Explain any four advantages of amorphous transformer.

Description : Explain any four advantages of amorphous transformer.

Last Answer : Advantages of amorphous core transformer: 1) Lowest hysteresis loss. 2) Low eddy current loss. 3) Low temperature rise. 4) Up to 75% energy saving using amorphous metal than conventional metal. 5 ... capacity. 9) High Reliability. 10) Excellent short circuit capacity. 11) Less maintenance cost. 

State the advantages of amorphous core type distribution transformer.

Description : State the advantages of amorphous core type distribution transformer.

Last Answer : Advantages of amorphous core type distribution transformer: 1) Increases efficiency of transformer as constant losses are reduced by 75 % compared to conventional transformers. 2) The material has high ... . 7) High Reliability. 8) Excellent short circuit capacity. 9) Less maintenance cost.

What is amorphous metal material? Give any three properties of amorphous metal.

Description : What is amorphous metal material? Give any three properties of amorphous metal.

Last Answer : Amorphous metal: The amorphous is metal alloy which differ in crystalline structure. The atoms are arranged in random configuration.  Properties of amorphous metal: 1) Thermal conductivity of ... . 6) The alloy does not undergo shrinkage on solidification, which helps in bones attachments.

What is Amorphous metal? Give one application of this metal.

Description : What is Amorphous metal? Give one application of this metal.

Last Answer : Amorphous Metals: Amorphous Metals means materials that do not possess a particular structure. Metal alloys typically possess crystalline atomic structure. The atoms are arranged in particular ... cores of special transformers d) Manufacturing magnetic sensors e) Magneto-motive sensors 

The product obtained after heating. the gypsum at 125°C?

Description : The product obtained after heating. the gypsum at 125°C?

Last Answer : Plaster of Paris

The product obtained after the heating of White Phosphorous at a high temperature is?

Description : The product obtained after the heating of White Phosphorous at a high temperature is?

Last Answer : Black Phosphorous

Magnesium oxide can be obtained by heating :-

Description : Magnesium oxide can be obtained by heating :-

Last Answer : Magnesium oxide can be obtained by heating :- A. `MgCO_(3)` B. `Mg(NO_(3))_(2)` C. `Mg(OH)_(2)` D. All

The volume of `CO_(2)` at STP obtained by heating 1 g of `CaCO_(3)` will be

Description : The volume of `CO_(2)` at STP obtained by heating 1 g of `CaCO_(3)` will be

Last Answer : The volume of `CO_(2)` at STP obtained by heating 1 g of `CaCO_(3)` will be A. 1 L B. `22.4 L` C. `0.224 L` D. `11.2 L`

Calculate the weight of lime (CaO) obtained by heating 200 kg of 95% pure limestone `(CaCO_(3))` :

Description : Calculate the weight of lime (CaO) obtained by heating 200 kg of 95% pure limestone `(CaCO_(3))` :

Last Answer : Calculate the weight of lime (CaO) obtained by heating 200 kg of 95% pure limestone `(CaCO_(3))` : A. 104.4 kg B. 105.4 kg C. 212.8 kg D. 106.4 kg