The luster of a metal is due to - (1) high polishing (2) high density (3) chemical inertness (4) presence of free electrons

The luster of a metal is due to - (1) high polishing (2) high density (3) chemical inertness (4) presence of free electrons
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(4) presence of free electrons Explanation: Lustre or luster is the way light interacts with the surface of a crystal, rock, or mineral. The word traces its origins back to the Latin lux, meaning "light", and generally implies radiance, gloss, or brilliance.
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(3) reflection of light due to the presence of free electrons Explanation: Lustre (or luster) is the way light interacts with the surface of a crystal, rock, or mineral. The word traces its origins back to the latin lux, meaning "light", and generally implies radiance, gloss, or brilliance. Metals in general have high electrical conductivity, high thermal conductivity, and high density. Typically they are malleable and ductile, deforming -under stress without cleaving.

Description : (3) reflection of light due to the presence of free electrons Explanation: Lustre (or luster) is the way light interacts with the surface of a crystal, rock, or mineral. The word ... conductivity, and high density. Typically they are malleable and ductile, deforming -under stress without cleaving.

Last Answer : Cloud is a colloidal dispersion of – (1) Air in a dispersion medium of water (2) Fog in a dispersion medium of water (3) Mist in a dispersion medium of air (4) Water drops in a dispersion medium of air

The lustre of the metals is because of (1) high density, due to closed packing of atoms (2) high polish (3) reflection of light due to the presence of free electrons (4) absorption of light due to the presence of cavities

Description : The lustre of the metals is because of (1) high density, due to closed packing of atoms (2) high polish (3) reflection of light due to the presence of free electrons (4) absorption of light due to the presence of cavities

Last Answer : reflection of light due to the presence of free electrons

The silver luster of the metals can be attributed to one of the following. It is attributed to their free w) protons x) ions y) neutrons z) electrons

Description : The silver luster of the metals can be attributed to one of the following. It is attributed to their free w) protons x) ions y) neutrons z) electrons

Last Answer : ANSWER: Z -- ELECTRONS 

The luster of a metal is due to?

Description : The luster of a metal is due to?

Last Answer : presence of free electrons

Pollution by particulate matter emission in the atmosphere does not take place during metal (A) Grinding (B) Machining(C) Cutting(D) Polishing

Description : Pollution by particulate matter emission in the atmosphere does not take place during metal (A) Grinding (B) Machining (C) Cutting (D) Polishing

Last Answer : (D) Polishing

Why are there a wide range of colours, hardness, crystal forms, luster and density found in minerals ? -SST 10th

Description : Why are there a wide range of colours, hardness, crystal forms, luster and density found in minerals ? -SST 10th

Last Answer : A wide range of colours, hardness, crystal forms, luster, and density is found in minerals because of the high levels of variations in physical and chemical conditions under which a mineral is formed.

The luster of diamond is due to-----? A. Reflection B. Total internal reflection (Answer) C. Refraction D. None of these

Description : The luster of diamond is due to-----? A. Reflection B. Total internal reflection (Answer) C. Refraction D. None of these

Last Answer : B. Total internal reflection (Answer)

Break out the Brill Cream, press your slickest suit, and spit-shine those kicks to a high luster - it's time to wish another jelly Happy 10K!

Description : Break out the Brill Cream, press your slickest suit, and spit-shine those kicks to a high luster - it's time to wish another jelly Happy 10K!

Last Answer : Hey, congrats man….....You know ya gotta save some for the shoe shine boy! :¬)

Polishing silver without silver polish?

Description : Polishing silver without silver polish?

Last Answer : answer:it’s here I’ve tried it and it does work!

Why diatoms are used in filtration and polishing?

Description : Why diatoms are used in filtration and polishing?

Last Answer : Why diatoms are used in filtration and polishing?

The vitamin present in rice polishing is?

Description : The vitamin present in rice polishing is?

Last Answer : Vitamin B2 RADIO ACTIVITY

Explain electro polishing.

Description : Explain electro polishing.

Last Answer : The article to be electro polished is taken as anode in the electrolytic bath with copper or lead cathode and a suitable electrolyte. When direct current is passed through the electrolyte, the ... the anode is electro polished. Ex: Sandwiched cookers are manufactured by the electro polishing method.

What is electro polishing?

Description : What is electro polishing?

Last Answer : Electro polishing is an electrochemical process that removes material from a metallic article. It is the reverse of electroplating.

Deep ponds, in which oxygen is absent except, perhaps, across a relatively thin surface layer, are called : (a) Aerobic ponds (b) Anaerobic ponds (c) Facultative ponds (d) Polishing ponds

Description : Deep ponds, in which oxygen is absent except, perhaps, across a relatively thin surface layer, are called : (a) Aerobic ponds (b) Anaerobic ponds (c) Facultative ponds (d) Polishing ponds

Last Answer : (b) Anaerobic ponds

The MAIN purpose of burnishing is: A. To help eliminating excess mercury (condensing) B. To condense margins C. Polishing of filling

Description : The MAIN purpose of burnishing is: A. To help eliminating excess mercury (condensing) B. To condense margins C. Polishing of filling

Last Answer : B. To condense margins

Give the uses of granite & marble polishing waste.

Description : Give the uses of granite & marble polishing waste. 

Last Answer : Uses of granite & marble polishing waste : 1. Used as fine aggregate in mortar & concrete. 2. Used in manufacturing of bricks. 3. Used inmanufacturing of artificial stone. 4. Used inmanufacturing of paving blocks. 

Give any two uses of granite and marble polishing waste.

Description : Give any two uses of granite and marble polishing waste.

Last Answer : Use of granite and marble polishing waste. 1. It is used in manufacturing of brick and tiles 2. It is used for filling joints in flooring. 3. It is used in self-compacting concrete.

(A) Ether behaves as bases in the presence of mineral acids. (R ) Due to the presence of lone pair of electrons on oxygen.

Description : (A) Ether behaves as bases in the presence of mineral acids. (R ) Due to the presence of lone pair of electrons on oxygen.

Last Answer : (A) Ether behaves as bases in the presence of mineral acids. (R ) Due to the presence of lone pair of ... R is false D. A is false but R is true

(A) Ether behaves as bases in the presence of mineral acids. (R ) Due to the presence of lone pair of electrons on oxygen.

Description : (A) Ether behaves as bases in the presence of mineral acids. (R ) Due to the presence of lone pair of electrons on oxygen.

Last Answer : (A) Ether behaves as bases in the presence of mineral acids. (R ) Due to the presence of lone pair of ... R is false D. A is false but R is true

The difference between isotopes of an element is due to the presence of a different number of (a) Protons (b) Neutrons (c) Electrons (d) Photons

Description : The difference between isotopes of an element is due to the presence of a different number of (a) Protons (b) Neutrons (c) Electrons (d) Photons

Last Answer : Ans:(b)

(1) they contain free electrons Explanation: Metals typically consist of closepacked atoms, meaning that the atoms are arranged like closely packed spheres. Two packing motifs are common, one being bodycentered cubic wherein each metal atom is surrounded by eight equivalent atoms. The other main motif is face-centered cubic where the metal atoms are surrounded by six neighboring atoms. Several metals adopt both structures, depending on the temperature.

Description : (1) they contain free electrons Explanation: Metals typically consist of closepacked atoms, meaning that the atoms are arranged like closely packed spheres. Two packing motifs are common, one ... surrounded by six neighboring atoms. Several metals adopt both structures, depending on the temperature.

Last Answer : Helium gas is filled in ballons because (1) its atomic number is 2 (2) it is lighter than air (3) it is one of the constitutents of water (4) it is a noble gas

Metal are good conductors, because (1) they contain free electrons (2) the molecules in them are very close to each other (3) the molecules in them collide very freely (4) they contain reflecting surface

Description : Metal are good conductors, because (1) they contain free electrons (2) the molecules in them are very close to each other (3) the molecules in them collide very freely (4) they contain reflecting surface

Last Answer : they contain free electrons

What are the best glosses/glazes treatments to give the hair amazing shine and luster?

Description : What are the best glosses/glazes treatments to give the hair amazing shine and luster?

Last Answer : answer:Some people use olive oil, some prefer mashed bananas, still others use avocado. I’ve even heard of people using mayonnaise. What works varies by the texture/condition of an individuals hair. It’s not a one-product-suits-all situation.

what feldspar luster is?

Description : what feldspar luster is?

Last Answer : dooky

What luster is muscovite?

Description : What luster is muscovite?

Last Answer : Need answer

What kind of luster does muscovite have?

Description : What kind of luster does muscovite have?

Last Answer : Need answer

What Diamonds luster?

Description : What Diamonds luster?

Last Answer : Need answer

What do you call a luster that is dull and earthy?

Description : What do you call a luster that is dull and earthy?

Last Answer : Feel Free to Answer

Is luster a good characteristic to use for the identification of minerals Why or why not?

Description : Is luster a good characteristic to use for the identification of minerals Why or why not?

Last Answer : What is the answer ?

What is the luster of metamorphic rock?

Description : What is the luster of metamorphic rock?

Last Answer : Need answer

What is the state color and luster of magnesium?

Description : What is the state color and luster of magnesium?

Last Answer : Magnesium is a solid metal, gray and shiny.

What is the state color and luster of bromine?

Description : What is the state color and luster of bromine?

Last Answer : Bromine is a red liquid.

Mohars scale is used to determine the — of rocks. a. Hardness b. Luster c. Color d. None of these

Description : Mohars scale is used to determine the — of rocks. a. Hardness b. Luster c. Color d. None of these

Last Answer : a. Hardness

Which physical properties of a given mineral displays the greatest variation A) color B) hardness C) luster D) streak

Description : Which physical properties of a given mineral displays the greatest variation A) color B) hardness C) luster D) streak

Last Answer : color

Which of the following is not considered a physical property of minerals? A) silicate structure B) streak C) hardness D) luster

Description : Which of the following is not considered a physical property of minerals? A) silicate structure B) streak C) hardness D) luster

Last Answer : silicate structure

Which of the following is an undesirable property of slag produced during the Pyrometallurgical method of metal extraction from its ore? (A) High fusibility & fluidity (B) High thermal conductivity (C) Low density (D) High chemical activity

Description : Which of the following is an undesirable property of slag produced during the Pyrometallurgical method of metal extraction from its ore? (A) High fusibility & fluidity (B) High thermal conductivity (C) Low density (D) High chemical activity

Last Answer : B) High thermal conductivity

Rutherford’s scattering experiment proved the presence of - (1) atoms in all matter (2) electrons in atoms (3) neutrons in atoms (4) nucleusin atoms

Description : Rutherford’s scattering experiment proved the presence of - (1) atoms in all matter (2) electrons in atoms (3) neutrons in atoms (4) nucleusin atoms

Last Answer : (4) nucleusin atoms Explanation: Ernest Rutherford and his fellows Geiger and Marsden proved between 1911 and 1913 the existence of the atomic nucleus. This scattering experirnent led to the development of the Rutherford model (planetary model) of the atom, and eventually to the Bohr model.

Acetamide is a much weaker base than ammonia. This is because (a) the electron withdrawing effect of the C=O group makes the lone pair of electrons on nitrogen atom less available for protonation. (b) ) the electron withdrawing effect of the C=O group makes the lone pair of electrons on nitrogen atom more available for protonation. (c) the presence of CH3 group sterically hinders the protonation of the NH2 group. (d) an H atom from the nitrogen is less easily lost from CH3CONH2 than from NH3.

Description : Acetamide is a much weaker base than ammonia. This is because (a) the electron withdrawing effect of the C=O group makes the lone pair of electrons on nitrogen atom less available for protonation. (b) ) ... NH2 group. (d) an H atom from the nitrogen is less easily lost from CH3CONH2 than from NH3.

Last Answer : the electron withdrawing effect of the C=O group makes the lone pair of electrons on nitrogen atom less available for protonation

Rutherford’s scattering experiment proved the presence of (1) atoms in all matter (2) electrons in atoms (3) neutrons in atoms (4) nucleus in atoms

Description : Rutherford’s scattering experiment proved the presence of (1) atoms in all matter (2) electrons in atoms (3) neutrons in atoms (4) nucleus in atoms

Last Answer : nucleus in atoms

Electric current in a metal wire is due to the flow of — (1) Electrons (2) Protons (3) Ions (4) Holes

Description : Electric current in a metal wire is due to the flow of — (1) Electrons (2) Protons (3) Ions (4) Holes

Last Answer : (1) Electrons Explanation: A solid conductive metal contains mobile, or free electrons, originating in the conduction electrons. When a metal wire is connected across the two terminals of a DC ... the conductor are forced to drift toward the positive terminal under the influence of this field.

Electric current in a metal wire is due to the flow of— (1) Electrons (2) Protons (3) Ions (4) Holes

Description : Electric current in a metal wire is due to the flow of— (1) Electrons (2) Protons (3) Ions (4) Holes

Last Answer : Electrons

Photo chemical smog is a result-ant of the reaction among – (1) High concentration of NO2, O3, and CO in the evening (2) CO, CO2 and NO2 at low temperature (3) CO, O2 and peroxy acetyl nitrate in the presence of Sunlight (4) NO2, O3 and peroxy acetyl nitrate in the presence of Sunlight

Description : Photo chemical smog is a result-ant of the reaction among – (1) High concentration of NO2, O3, and CO in the evening (2) CO, CO2 and NO2 at low temperature (3) CO, O2 and peroxy acetyl nitrate in the presence of Sunlight (4) NO2, O3 and peroxy acetyl nitrate in the presence of Sunlight

Last Answer : (4) NO2, O3 and peroxy acetyl nitrate in the presence of Sunlight Explanation: Photochemical smog is a unique type of air pollution which is caused by reactions between sunlight and pollutants like hydrocarbons and nitrogen dioxide (NO and NO2).

(2) experience collision less frequently Explanation: When an electric field is applied, both the valence electrons and the free electrons move in the same direction. The hole direction is opposite to that of valence electron but the mobility is the same. Even for the same electric field, valence electrons cannot move as freely as the free electrons because its movement is restricted due to collisions. Therefore, the velocity of valence electrons is less compared to free electrons. In other words, the velocity of holes is less compared to free electrons. This means mobility is also less for a hole compared to free electron.

Description : (2) experience collision less frequently Explanation: When an electric field is applied, both the valence electrons and the free electrons move in the same direction. The hole direction is opposite to that ... to free electrons. This means mobility is also less for a hole compared to free electron.

Last Answer : Carbon dioxide is called a greenhouse gas because - (1) its concentration remains always higher than other gases (2) it is used in photosynthesis (3) it absorbs infrared radiation (4) it emits visible radiation

Phenol is an ortho-para director because the hydroxyl group : (a) donates electrons that increase electron density at ortho and para positions favoring nucleophilic attack. (b) donates electrons that increase electron density at ortho and para positions favoring electrophilic attack. (c) donates electrons to the ortho and para positions and attracts electrons away from meta positions favoring nucleophilic attack of the ring. (d) donates electrons to the ortho and para positions and attracts electrons away from meta positions favoring electrophilic attack on the ring.

Description : Phenol is an ortho-para director because the hydroxyl group : (a) donates electrons that increase electron density at ortho and para positions favoring nucleophilic attack. (b) donates ... para positions and attracts electrons away from meta positions favoring electrophilic attack on the ring.

Last Answer : donates electrons that increase electron density at ortho and para positions favoring electrophilic attack.

Compared to Chlorine, Bromine has: w) smaller atomic size x) higher density y) lower boiling point z) greater number of outer electrons

Description : Compared to Chlorine, Bromine has: w) smaller atomic size x) higher density y) lower boiling point z) greater number of outer electrons

Last Answer : ANSWER: X -- HIGHER DENSITY

The mean free path of electrons in a metal is `4 xx 10^(-8)m` The electric field which can give on an average `2eV` energy to an electron in the metal

Description : The mean free path of electrons in a metal is `4 xx 10^(-8)m` The electric field which can give on an average `2eV` energy to an electron in the metal

Last Answer : The mean free path of electrons in a metal is `4 xx 10^(-8)m` The electric field which can give on an average ... 11)` C. `8xx10^(-11)` D. `5xx10^(7)`

A dental disease characterised by mottling of teeth is due to the presence of certain chemical element in drinking water. Which of the following is th

Description : A dental disease characterised by mottling of teeth is due to the presence of certain chemical element in drinking water. Which of the following is th

Last Answer : A dental disease characterised by mottling of teeth is due to the presence of certain chemical element ... mercury B. fluorine C. Boron D. Chlorine

Paper turns yellowish with age due to the presence of the chemical

Description : Paper turns yellowish with age due to the presence of the chemical

Last Answer : lignin.

The equilibrium constant of a catalytic chemical reaction __________ due to the presence of a catalyst. (A) Increases (B) Decreases (C) Remain unaffected (D) Unpredictable from the data

Description : The equilibrium constant of a catalytic chemical reaction __________ due to the presence of a catalyst. (A) Increases (B) Decreases (C) Remain unaffected (D) Unpredictable from the data

Last Answer : (C) Remain unaffected

When a metal is heated in a flame, the electrons absorb energy and jump to higher energy state. On coming back to the lower energy state, they emit light, which we can observe in - (1) Raman spectra (2) Absorption spectra (3) Emission spectra (4) Fluorescence

Description : When a metal is heated in a flame, the electrons absorb energy and jump to higher energy state. On coming back to the lower energy state, they emit light, which we can observe in - (1) Raman spectra (2) Absorption spectra (3) Emission spectra (4) Fluorescence

Last Answer : (3) Emission spectra Explanation: When a metal atom is strongly heated, its electrons absorb the heat energy and jump to a higher energy level. When the electron returns to its original position it ... to the energy the electron has released at each stage °fits fall back to its original state.