Out of (a) Graphite and (b) Carborundum which one is harder ?

Out of (a) Graphite and (b) Carborundum which one is harder ?
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Carborundum.
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Carborundum is another name of – (1) Silicon carbide (2) Silicon oxide (3) Calcium carbide (4) Calcium oxide

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Last Answer : Carborundum is chemically silicon carbide. When a mixture of silicon and coke is heated in an electric furnace, silicon carbide is formed.

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Description : What is the structure of graphite ?

Last Answer : : In graphite, each carbon atom is sp2 hybridized and each carbon atom is bound to the other three carbon atoms. In this way huge hexagonal lattice is made. Each carbon atom has one unsaturated electron. Graphite is electrically conductive as these electrons are circulating throughout the molecule.

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Last Answer : (1) reducing the speed of fast neutrons Explanation: A graphite reactor is a nuclear reactor that uses carbon as a neutron moderator, which allows unenriched uranium to be used as nuclear fuel.

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Description : Which of the following is NOT malleable? (1) Graphite (2) Aluminium (3) Copper (4) Silver

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Which of the following is used as lubricant? (1) Graphite (2) Silica (3) Diamond (4) Iron Oxide

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Description : Lead pencil contains - (1) Lead nitrate (2) Graphite (3) Lead peroxide (4) Lead Sulphate

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The moderator used in a nuclear reactor is – (1) Uranium (2) Radium (3) Ordinary water (4) Graphite

Description : The moderator used in a nuclear reactor is – (1) Uranium (2) Radium (3) Ordinary water (4) Graphite

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The most pure form of Carbon among the options is – (1) Anthracite (2) Lampblack (3) Graphite (4) Wood Charcoal

Description : The most pure form of Carbon among the options is – (1) Anthracite (2) Lampblack (3) Graphite (4) Wood Charcoal

Last Answer : (1) Anthracite Explanation: There are three forms of pure carbon: graphite, coal and diamond. Among coal, Anthracite has the highest carbon content, the fewest impurities, and the highest calorific content ... the most metamorphosed type of coal in which the carbon content is between 92.1% and 98%.

The material used in the manufacture of lead pencil is – (1) Graphite (2) Lead (3) Carbon (4) Mica

Description : The material used in the manufacture of lead pencil is – (1) Graphite (2) Lead (3) Carbon (4) Mica

Last Answer : (1) Graphite Explanation: Pencils create marks via physical abrasion, leaving behind a trail of solid core material that adheres to a sheet of paper or other surface. They are noticeably distinct from ... of graphite mixed with a clay binder, leaving grey or black marks that can be easily erased.

Non-stick kitchenwares are coated with (1) PVC (2) Graphite (3) Teflon (4) Silicon

Description : Non-stick kitchenwares are coated with (1) PVC (2) Graphite (3) Teflon (4) Silicon

Last Answer : (3) Teflon Explanation: Polytetrafluoroethylene (FYIFE) is a synthetic fluoropolymer of tetrafluoroethylene that finds numerous applications. The best known brand name of FIFE is Teflon. PTFE is used as ... for pans and other cookware as it is hydrophobic and possesses fairly high heat resistance.

Hardest allotrope of carbon is - (1) diamond (2) graphite (3) coke (4) lamp black

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Last Answer : (1) diamond Explanation: Diamond is one well known allotrope of carbon. The hardness and high dispersion of light of diamond make it useful for both industrial applications and jewellery. Diamond is ... mineral. This makes it an excellent abrasive and makes it hold polish and luster extremely well.

Which of the following is used as filler in tyre of rubber? (1) Carbon black (2) Coal (3) Coke (4) Graphite

Description : Which of the following is used as filler in tyre of rubber? (1) Carbon black (2) Coal (3) Coke (4) Graphite

Last Answer : (1) Carbon black Explanation: The most common use (70%) of carbon black is as a pigment and reinforcing phase in automobile tires. Carbon black also helps conduct heat away from the tread and belt area of the tire, reducing thermal damage and increasing tire life.

Cement is formed by strongly heating a mixture of – (1) limestone and graphite (2) limestone and clay (3) chalk and graphite (4) clay and graphite

Description : Cement is formed by strongly heating a mixture of – (1) limestone and graphite (2) limestone and clay (3) chalk and graphite (4) clay and graphite

Last Answer : (2) limestone and clay Explanation: Cement is made by heating limestone (calcium carbonate) with small quantities of other materials (such as clay) to 1450 degree C in a kiln, in a process known as ... , or quicklime, which is then blended with the other materials that have been included in the mix.

The anode in a dry cell consists of – (1) Copper (2) Zinc (3) Cadmium (4) Graphite

Description : The anode in a dry cell consists of – (1) Copper (2) Zinc (3) Cadmium (4) Graphite

Last Answer : (2) Zinc Explanation: A "dry-cell" battery is essentially comprised of a metal electrode or graphite rod (elemental carbon) surrounded by a moist electrolyte paste enclosed in a metal cylinder. ... for the reduction halfreaction. A thin zinc cylinder serves as the anode and it undergoes oxidation.

Which of the following is used as a lubricant in heavy machines? (1) Bauxite (2) Sulphur (3) Phosphorus (4) Graphite

Description : Which of the following is used as a lubricant in heavy machines? (1) Bauxite (2) Sulphur (3) Phosphorus (4) Graphite

Last Answer : (4) Graphite Explanation: Graphite is used as a lubricant in heavy machines. it is made of carbon atoms arranged in sheets of hexagonal units - looks a lot like chicken-wire. Another sheet forms on ... ) between the sheets, so they are able to slide freely over each other without breaking any bonds.

Hardest material is - (1) Tungsten (2) Diamond (3) Steel (4) Graphite

Description : Hardest material is - (1) Tungsten (2) Diamond (3) Steel (4) Graphite

Last Answer : (2) Diamond Explanation: Diamondsare commonly known as the hardest substance on earth, used in drill bits for cutting applications.

In nuclear reactors, graphite is used as a/an – (1) fuel (2) lubricant (3) moderator (4) insulator

Description : In nuclear reactors, graphite is used as a/an – (1) fuel (2) lubricant (3) moderator (4) insulator

Last Answer : (3) moderator Explanation: A nuclear reactor is a device to initiate and control a sustained nuclear chain reaction. Most commonly they are used for generating electricity and for the ... turning them into thermal neutrons capable of sustaining a nuclear chain reaction involving uranium-235.

Lead pencil contains – (1) lead (2) ferrous sulphide (3) lead sulphide (4) graphite

Description : Lead pencil contains – (1) lead (2) ferrous sulphide (3) lead sulphide (4) graphite

Last Answer : (4) graphite Explanation: Most pencil cores are made of graphite mixed with a clay binder, leaving grey or black marks that can be easily erased. Graphite pencils are used for both writing ... with an eraser, it is resistant to moisture, most chemicals, ultraviolet radiation and natural aging.

Which one among the following is not a mixture? (1) Graphite (2) Glass (3) Brass (4) Steel

Description : Which one among the following is not a mixture? (1) Graphite (2) Glass (3) Brass (4) Steel

Last Answer : (1) Graphite Explanation: Graphite is a naturally-occurring form of crystalline carbon. It is a native element mineral found in metamorphic and igneous rocks. Graphite is a mineral of extremes.

What is the most common use of Graphite ?

Description : What is the most common use of Graphite ?

Last Answer : Ans. as lubricant.

Explain the difference in properties of diamond and graphite on the basis of their Structure?

Description : Explain the difference in properties of diamond and graphite on the basis of their Structure?

Last Answer : Ans.1. Diamond has three dimensional network whereas graphite has two successive layers. 2. Diamond has high density while graphite has low. 3. Diamond has sp3 and graphite has sp2 hybridised carbon atom.

Graphite is used as anode and not diamond. Assign reason.

Description : Graphite is used as anode and not diamond. Assign reason. 

Last Answer : Ans. In graphite there are free electrons which helps in electricalconductivity. 

In which of the following reactions, standard reaction entropy change (S°) is positive and standard Gibb’s energy change (G°) decreases sharply with increasing temperature? (1) 2 2 1 1 1 C graphite O (g) CO (g) 2 2 2   (2) 2 1 C graphite O (g) CO(g) 2   (3) 2 2 1 CO(g) O (g) CO (g) 2   (4) 2 1 Mg(s) O (g) MgO(s) 2  

Description : In which of the following reactions, standard reaction entropy change (S°) is positive and standard Gibb's energy change (G°) decreases sharply with increasing temperature? (1) 2 2 1 1 1 C graphite O (g) CO (g) 2 2 2   (2) 2 1 C ... CO(g) O (g) CO (g) 2   (4) 2 1 Mg(s) O (g) MgO(s) 2  

Last Answer : C graphite O (g) CO(g)

Graphite carbon atoms form planar layers in what regular geometric arrangement?

Description : Graphite carbon atoms form planar layers in what regular geometric arrangement?

Last Answer : ANSWER: HEXAGONAL 

The most pure form of Carbon among the options is (1) Anthracite (2) Lampblack (3) Graphite (4) Wood Charcoal

Description : The most pure form of Carbon among the options is (1) Anthracite (2) Lampblack (3) Graphite (4) Wood Charcoal

Last Answer : Anthracite

The moderator used in a nuclear reactor is (1) Uranium (2) Radium (3) Ordinary water (4) Graphite

Description : The moderator used in a nuclear reactor is (1) Uranium (2) Radium (3) Ordinary water (4) Graphite

Last Answer : Ordinary water