94420 + Interview Questions in Chemistry in Class 12

1.	Copper metal belongs to a crystal system represented by the crystal dimensions as
Answer» `ALPHA=beta=gamma=90^(@), a=B=C` `alpha ne beta ne gamma, a=b=c` `alpha=beta=90^(@), gammane90^(@) a=b=c` `alpha=beta=gamma=90^(@), a ne b ne c` Answer :A

Discussion

2.	Copper matte is the mixture of ……………..
Answer» COPPER (II) SULPHIDE + IRON (II) sulphide Copper (I) sulphide + Iron (I) sulphide Copper (II) sulphide + Iron (I) sulphide Copper (I) sulphide + Iron (II) sulphide Answer :D

Discussion

3.	Copper matte is charged into a silica lined converter in the extraction of copper. What is the role of silica lining there?
Answer» SOLUTION :The copper matte containing `Cu_(2)S` and FeS is put in silica lined converter. Some silica is also ADDED and hot air is blown to CONVERT remaining FeS to FeO, which is REMOVED as slag with silica.

Discussion

4.	Copper matte is .........
Answer» `CUS + FES ` `FeS + Cu_2S` `FEO + Cu_2S` `FeS + Cu_2O` ANSWER :B

Discussion

5.	Copper is unique in 3d series. Prove this statement.
Answer» Solution :COPPER is unique in 3d series having a stable +1 oxidation STATE. It is prone to disproportionate to the +2 and 0 oxidation states.

Discussion

6.	Copper is used for making wires used in electrical industry and for water and steam pipes.
Answer» ANSWER :1

Discussion

7.	Copper is very slowly oxidised on the surface in moist air, givinga green coating of vergiris is :
Answer» `Cu_(2)O` `CuCO_(3)` `CU(CH_(3)COO)_(2)*Cu(OH)_(2)` `CuSO_(4)` Answer :C

Discussion

8.	Copper is the most noble of the first transition metals and occurs in small deposits in several countries. Ores of copper include chalcanthite (CuSO_(4).5H_(2)O), atacamite (Cu_(2)Cl(OH)_(3)), cuprite (Cu_(2)O), copper glance (Cu_(2)S) and malachite (Cu_(2)(OH)_(2)CO_(3)). Howerver 80% of the world copper production comes from the ore chalcopyrites (CuFeS_(2)) the extraction of copper from chalcopyrites involves partial roasting of iron and self reduction. Q. In self reduction the reducing species is .... Select the correct options for blank.
Answer» `Cu^(+)` `O^(-2)` `S^(-2)` `SiO_(2)` Solution :`2CuFeS_(2)+4O_(2)overset(DELTA)toCu_(2)S+2FeO+3SO_(2)` `Cu_(2)S+FeO+SiO_(2)toFeSiO_(3)` (FUSIBLE slag) `+Cu_(2)S` (MATTE)

Discussion

9.	Copper is the most noble of the first row transition. Ores of copper include chalcanthite (CuSO_(4).5H_(2)O), atacamite (Cu_(2)Cl(OH)_(3)). However, 80% of the world copper production comes from the ore chalcopurite (CuFeS_(2)) The extraction of copper from chalcopyrite involves partial roasting of iron and sefl-reduction. In self-reduction, the reduction species is
Answer» S `O^(2-)` `S^(2-)` `SO_(2)` SOLUTION :`S^(2-)` ACTS as reducing species in SELF REDUCTION REACTION `2Cu_(2)O+Cu_(2)S to 6 Cu+SO_(2)`

Discussion

10.	Copper is the most noble of the first row transition metals and occurs in small deposits in several countries. Ores of copper include chalcanthite (CuSO_(4).5H_(2)O) atacamite (Cu_(2)Cl(OH)_(3)),Cuprite (Cu_(2)O) , copper glance (Cu_(2)S) and malachite (Cu_(2)(OH)_(2)CO_(3)). however 80% of the world copper productioncomes from the ore chalcopyrite (CuFeS_2). the extraction of copper from chalcopyrite invovles partial roasting . removal of iron and self-reduction. IF the 0.05 molar solution of M^(+) is replaced by a 0.0025 molar M^(+) solution. then the magnitude of the cell potential would be
Answer» 35 mV 70 mV 140 mV 700 mV Answer :C

Discussion

11.	Copper is the most noble of the first row transition. Ores of copper include chalcanthite (CuSO_(4).5H_(2)O), atacamite (Cu_(2)Cl(OH)_(3)). However, 80% of the world copper production comes from the ore chalcopurite (CuFeS_(2)) The extraction of copper from chalcopyrite involves partial roasting of iron and sefl-reduction. Partial roasting of Chalcopyrite produces
Answer» `Cu_(2)SandFeO` `Cu_(2)OandFeO` `CusandFe_(2)O_(2)` `Cu_(2)OandFe_(2)O_(2)` SOLUTION :`2CuFeS_(2) + 4O_(2) to Cu_(2) S+2Fe+3SO_(2)`

Discussion

12.	Copper is the most noble of the first row transition. Ores of copper include chalcanthite (CuSO_(4).5H_(2)O), atacamite (Cu_(2)Cl(OH)_(3)). However, 80% of the world copper production comes from the ore chalcopurite (CuFeS_(2)) The extraction of copper from chalcopyrite involves partial roasting of iron and sefl-reduction. Iron is removed from chalcopyrite as
Answer» FeO FeS `Fe_(2)O_(3)` `FeSiO_(3)` SOLUTION :IRON is REMOVED in the FORM of slag of `FeSO_(3)` `FeO+SiO_(2) to FeSiO_(3)`

Discussion

13.	Copper is the most noble among the first row transition metals and occurs in small deposits in several countries. Ores of copper include chalcopyrite (CuFeS_(2)), cuprite (Cu_(2)O), copper glance (Cu_(2)S) and malachite [CyCO_(3).Cu(OH)_(2)]. However 80% of the world copper production comes from the ore chalcopyrite(CuFeS_(2)). the extraction of copper from chalcopyrite involves partial roasting , removal of ironand self-reduction. In self-reduction, the reducing species is
Answer» S `O^(2-)` `S^(2-)` `SO_(2)` SOLUTION :They get oxidised to `SO_(2)`. Here `S^(2-)` IONS are the REDUCING agent.

Discussion

14.	Copper is the most noble among the first row transition metals and occurs in small deposits in several countries. Ores of copper include chalcopyrite (CuFeS_(2)), cuprite (Cu_(2)O), copper glance (Cu_(2)S) and malachite [CyCO_(3).Cu(OH)_(2)]. However 80% of the world copper production comes from the ore chalcopyrite(CuFeS_(2)). the extraction of copper from chalcopyrite involves partial roasting , removal of ironand self-reduction. Iron is removed from chalcopyrite as
Answer» FeO FeS `Fe_(2)O_(3)` `FeSiO_(3)` SOLUTION :IRON is removed as `FeSO_(3)`

Discussion

15.	Copper is the most noble among the first row transition metals and occurs in small deposits in several countries. Ores of copper include chalcopyrite (CuFeS_(2)), cuprite (Cu_(2)O), copper glance (Cu_(2)S) and malachite [CyCO_(3).Cu(OH)_(2)]. However 80% of the world copper production comes from the ore chalcopyrite(CuFeS_(2)). the extraction of copper from chalcopyrite involves partial roasting , removal of ironand self-reduction. Partial roasting of chalcopyrite produces
Answer» `Cu_(2)S` and FEO `Cu_(2)` and FeO CuS and `Fe_(2)O_(3)` `Cu_(2)O " and " F_(2)O` SOLUTION :`2CuFeS_(2)+4O_(2) OVERSET("heat") to Cu_(2)S+2FeO+3SO_(2)`

Discussion

16.	Copper is the most moble of first row transition meals and occurs in small deposits in several countries ares of copper include chalcanthite (CuSO_(4)5H_(2)O), afecamie (CuCHOH)_(3)), cuprite(Cu_(2)O) Copper glance (Cu_(2)S) and rolachite (Cu_(2)(OH)_(2)CO_(3)). However, 80% of the world copper production comes from the ore chalcopyrite (CuFeS_(2)). The extraction of copper from chalopyrite in polves partial roasting, removal of Iron self-reduction. In sell reduction the reducing species is
Answer» S `O^(-2)` `S^(-2)` `SO_(2)` Solution :In SELF REDUCTION the reducing SPECIES is `S^(-2).Cu_(2)S+2Cu_(2)O to 6Cu+SO_(2)`

Discussion

17.	Copper is the most moble of first row transition meals and occurs in small deposits in several countries ares of copper include chalcanthite (CuSO_(4)5H_(2)O), afecamie (CuCHOH)_(3)), cuprite(Cu_(2)O) Copper glance (Cu_(2)S) and rolachite (Cu_(2)(OH)_(2)CO_(3)). However, 80% of the world copper production comes from the ore chalcopyrite (CuFeS_(2)). The extraction of copper from chalopyrite in polves partial roasting, removal of Iron self-reduction. Iron is removed from chalcopyrite as
Answer» FeO `FeS` `Fe_(2)O_(3)` `FeSiO_(3)` SOLUTION :IRON is removed from CHALCOPYRITES `(CuFeS_(2))` as slag `FeSiO_(3), FeO+SiO_(2) to FeSiO_(3)`

Discussion

18.	Copper is the most moble of first row transition meals and occurs in small deposits in several countries ares of copper include chalcanthite (CuSO_(4)5H_(2)O), afecamie (CuCHOH)_(3)), cuprite(Cu_(2)O) Copper glance (Cu_(2)S) and rolachite (Cu_(2)(OH)_(2)CO_(3)). However, 80% of the world copper production comes from the ore chalcopyrite (CuFeS_(2)). The extraction of copper from chalopyrite in polves partial roasting, removal of Iron self-reduction. Partial Roasting of chalcopyrite produces
Answer» `Cu_(2)S and FeO` `Cu_(2)O and FeO` `CuS and Fe_(2) O_(3)` `Cu_(2) to and Fe_(2)O_(3)` Solution :PARTIAL roasting of chalcopyrites PRODUCES `Cu_(2)S` & FeO.

Discussion

19.	Copper isthemistnobleoffirstrow transitionmetalsandoccursinsmalldepositsinseveralcountries.Oresofcopperinclude chalcanthite(CuSO_4. 5H_ 2O ) ,atacamite(Cu_2Cl (OH) _3 ),cuprite(Cu_ 2 O ), copperglance(Cu_ 2S),andmalachite(Cu_2 (OH)_2CO_3 ) . However, 80 % oftheworldcopperproductioncomesfrom theorechalcopyrite(CuFeS_2) . The extraction ofcopper from chalcopyrite involvespartialroasting,removalofironandself - reductionPartialroastingof chalcopyriteproduces
Answer» `Cu_ 2S`and FeO ` Cu_ 2 O`and FE O CuS and`Fe_2O_ 3` `Cu_2Oand Fe_2 O _ 3` Solution :Duringpartialroasting,` CuFe S _ 2`is firstconvertedinto amixtureof` Cu_ 2S` and FeS.Further,sinceironis morereactivethanCu, therefore, FeS ispreferentiallyoxidisedtoFeO. THUS,partialroastingofchalcopyriteproduces` Cu_2S `andFeO. ` underset ("Chalcopyrite")( 2Cu Fe S_ 2 )+O_2overset (DELTA ) to Cu_ 2S +2 Fe S +SO_2` ` 2 FeS +3 O_2 overset (Delta ) TO2 FeO+2 SO_2` Thus,option (a) iscorrect.

Discussion

20.	Copper isthemistnobleoffirstrow transitionmetalsandoccursinsmalldepositsinseveralcountries.Oresofcopperinclude chalcanthite(CuSO_4. 5H_ 2O ) ,atacamite(Cu_2Cl (OH) _3 ),cuprite(Cu_ 2 O ), copperglance(Cu_ 2S),andmalachite(Cu_2 (OH)_2CO_3 ) . However, 80 % oftheworldcopperproductioncomesfrom theorechalcopyrite(CuFeS_2) . The extraction ofcopper from chalcopyrite involvespartialroasting,removalofironandself - reductionIron isremovedfromchalcopyriteas
Answer» ` FeO` `FES ` `Fe_ 2 O_3` `FeSiO_ 3` SOLUTION :Thepartially roastedoreismixedwith SILICA (FLUX )and littlecokeandheatedin ablastfurnacewhenFeOpresentas impurityisremovedasferrous silicateslag. ` FeO + SiO_2to FeSiO _3downarrow`

Discussion

21.	Copper isthemistnobleoffirstrow transitionmetalsandoccursinsmalldepositsinseveralcountries.Oresofcopperinclude chalcanthite(CuSO_4. 5H_ 2O ) ,atacamite(Cu_2Cl (OH) _3 ),cuprite(Cu_ 2 O ), copperglance(Cu_ 2S),andmalachite(Cu_2 (OH)_2CO_3 ) . However, 80 % oftheworldcopperproductioncomesfrom theorechalcopyrite(CuFeS_2) . The extraction ofcopper from chalcopyrite involvespartialroasting,removalofironandself - reductionInself- reduction, thereducingspecies is
Answer» S ` O ^(2-) ` `S^(2-) ` `SO_2` Solution :Duringself- REDUCTION, ` Cu_2 S`, i.e.,` S ^( 2 -) `actsas a REDUCING speciesand hencereduces` CU _2 O `tocoppermetal. ` OVERSET (2-)S + 2 Cu_ 2 Oto4 Cu+ SO_2. `

Discussion

22.	Copper is refined by :
Answer» Smelting ROASTING Electrolytic method HEATING in a BLAST furnace Answer :C

Discussion

23.	Copper is purified byb electrolytic refining of blister copper. The conrect statement(s) about this process is (are)
Answer» Impure Cu stirp is USED as cathode Acidified aqueous `CuSO_(4)` is used as electrolyte Pure Cu DEPOSITS at cathode IMPURITIES SETTLE as anode-mud Solution :Impure Cu is used asanode pure Cu deposited at cathode. Electrolyte is acidified solution of `CuSO_(4)`. Impurities settle as anode mud.

Discussion

24.	Copperis purifiedbyelectrolyticrefiningof blistercopper. Thecorrectstatement (s) aboutthisprocessis(are).
Answer» impure Cu STRIP is usedas cathode acidified `CuSO_4 `is used as ELECTROLYTE pure Cu depositsatcathode impuritiessettleas ANODE MUD Solution :Impure Custripisusedasthecathodebutisusedas theanode.Allotheroptionsare CORRECT.

Discussion

25.	Copper is purified by electro-refining of blister copper. The correct statement (s) about this process is (are)
Answer» IMPURE copper STRIP is used as cathode Acidified aqueous `CuSO_(4)` is used as electrolyte Pure copper is deposited at cathode Impurities settle as anode-mud. Solution :All the STATEMENTS are CORRECT.

Discussion

26.	Copper is purifed by electrolaytic refining of blister copper ,The correct statement (s) about this prcess is (are)
Answer» IMPURE Cu strip USED as cathode Acidifed AQUEOUS `CuSO_(4)`is used as ELECTROLYTE Pure Cu DEPOSITE at cathode Impurites settle as anode -mud Answer :bcd

Discussion

27.	Copper is prepared as alloying element in ornamental gold. Why?
Answer» Solution :Copper is present in the same group where GOLD is placed. One of the REQUIREMENTS of ALLOY prepartion is similar VALENCY of alloying elements

Discussion

28.	Give reason : Copper is more electro positive than silver.
Answer» Solution :COPPER is above SILVER in ELECTRO CHEMICAL SERIES.

Discussion

29.	Copper is extracted from its ore copper pyrite throupgh the scheme given below : {:("Copper pyrite" overset("Roasting")to ubrace(X+Y) + SO_2uarr),(""+underset("flux")("Coke") darr "smelting"):} underset("Copper metal")("Crude") overset("Bessemerisation")larr "Molten matte slag" THe Compound X and Y are respectively.
Answer» `Cu_2S and FEO` `Cu_2S and Fe_2O_3` `Cu_2S and FES` `CUS and Fes` ANSWER :C

Discussion

30.	Copper is mainly extracted from _________
Answer» Malachite COPPER pyrites CUPRITE Azurite SOLUTION :Extraction of copper

Discussion

31.	Copper is extracted from copper pyrites ore by heatingin a blast furnace. The methodis basedon the principal that
Answer» copper has more AFFINITY for OXYGEN than SULPHUR at HIGH temperature. iron has more affinity for oxygen than copper at high temperature. sulphur has less affinityfor oxygenat high temperature copper has less affinityfor oxygen than sulphur at high temperature. Answer :B

Discussion

32.	Copper is extracted from pyrites by heating in a Bessemer converter. The method is based onthe principle that
Answer» Copper has less affinity for OXYGEN than sulphur at HIGH temperature Copper has moreaffinity for oxygen than sulphur at high temperature Sulphur has less affinity for oxygen at high temperature IRON has less affinity for oxygen than sulphur at high temperature Answer :B

Discussion

33.	Copperisextractedfromcopperpyritesby heatingin a bessemerconverter.The methodisbasedonthe principlethat
Answer» IRON has less affinityfor oxygenthen sulphurathigh TEMPERATURE sulphurhas less affinityforoxygenat high temperature copperhas moreaffinityfor oxygenthansulphurat high temperature copperhasless affinityforoxygenthansulphurathightemperature Solution :Whencopperpyritesisheatedin abessemer converterin presenceofablastofoxygen. It isinitiallyconvertedintoamixtureof` Cu_ 2 S, FeSand SO_2 `. `2 Cu FeS_ 2+O_2toCu_2S+2FeS+SO_2` Since ` Cu _2O `is notformedinitiallyeveninpresenceof` O_ 2 `,therefore,copperhaslessaffinityfor OXYGEN than sulphurat high temperature , i.e.,option(d)is CORRECT.

Discussion

34.	Copper is a stronger reducing agent than silver.
Answer» Solution :COPPER is above silver in electro CHEMICAL SERIES.

Discussion

35.	Copperisextracted from
Answer» CUPRITE copperglance MALACHITE COPPER PYRITES ANSWER :D

Discussion

36.	Copper is conducting as such while copper sulphate is conducting only in molten state or in aqueous solution. Explain.
Answer» SOLUTION :Copper is conducting as such because it contains free electrons. `CuSO_(4)` is conducting in molten STATE or in AQUEOUS solution because it gives IONS only in the molten state or aqueous solution.

Discussion

37.	Copper (I) compounds are white and diamagnetic while copper (II) compounds are coloured and paramagnetic and form coloured compounds.Explain.
Answer» Solution :In Copper (I) ION, all orbitals are completely filled `(1s^(2) 2S^(2) 2p^(6) 3s^(2) 3p^(6) 3s^(10))` and, therefore, it is diamagnetic and forms white compounds. Copper (II) ion has electronic CONFIGURATION. `(1s^(2) 2s^(2) 2p^(6) 3s^(2) 3p^(6) 3s^(9))` ( has ONE unpaired electron) and , therefore,it is PARAMAGNETIC and forms coloured compounds.

Discussion

38.	Copper has the face centred cubic structure. The coordination number of each ion is:
Answer» 4 12 14 8 Solution :12

Discussion

39.	Copper has the face centred cubic structure. The coordination number of each ion is:a) 4b) 12c) 14d) 8
Answer» 4 12 14 8 Solution :12

Discussion

40.	Copper from copper sulphate solution can be displaced by ………….The standared reduction potentials of some electrodes are given below: E^@(Fe^(2+),Fe) =-0.44V E^@(Zn^(2+),Zn)=-0.76 V E^@(Cu^(2+),Cu) =+0.34V E^@(Cr^(3+),Cr)=-0.74V E^@(H^+,1/2 H_2)=-0.00 V
Answer» `H_2` Zn Cr All Answer :D

Discussion

41.	Copper crystals have fcc unit cells: Compute the number of atoms per unit cell of copper crystal.
Answer» Solution :In a fcc unit CELL, atoms are present at the eight corners and also at the six FACE CENTRES of the unit cell. therefore number of CU atoms in a unit cell = `(frac{1}{8}xx8)+(frac{1}{2}xx6)=1+3=4`

Discussion

42.	Copper crystals have fcc unit cells: Calculate the mass of a unit cell of copper crystal (atomic mass of copper=63.54u)
Answer» Solution :Mass of a unit cell of COPPER crystal = mass of 4 ATOMS of CU = `frac{ZM}{N}` = `frac{4xx63.54}{6.02xx10^23} = 42.21xx10^(-23)= 4.221xx10^(-22)g`

Discussion

43.	Copper crystallizes into an fec lattice with edge length of 3.61 xx 10^(-8) cm. Calculate the density of copper. [Given" " Cu = 63.5 g mol^(-1), N_(A) = 6.022 xx 10^(23) mol^(-1)]
Answer» Solution :In fcc lattice `z=4, M="63.5 g MOL"^(-1),N_(A)=6.022xx10^(23)" mol"^(-1), a=3.61xx10^(-8)CM` `"Density d"=(zM)/(a^(3).N_(A))=(4xx63.5)/((3.61xx10^(-8))^(3)xx6.022xx10^(23))=(254)/(47.046xx10^(-24)xx6.022xx10^(23))` `=(254)/(283/311xx10^(-1))=(254)/(28.33)="8.965 g cm"^(-3)`

Discussion

44.	Copper crystallizes in fcc with a unit cell length of 361 pm. What is the radius of copper atom ?
Answer» 108 PM 127 pm 157 pm 181pm Solution :For fcc structure `r = ( a)/( 2sqrt(2)) = ( 361)/( 2sqrt(2)) = ( 361)/( 2 XX 1.414)` `= 127.6 `pm

Discussion

45.	Copper crystallizes into a fcc lattice with edge length 3.61 xx 10^(-8) cm. Calculate the density of the crystal (Atomic mass of copper = 63.5 g/mol and Avogadro number = 6.022 xx 10^(23) mol^(-1))
Answer» Solution :`d = (ZM)/(a^(3) N_(A))` `d = (4 XX 63.5)/((3.61)^(3) xx 10^(-24) xx 6.022 xx 10^(23))` `d = (254)/(28.33)` d = 8.9 `g//cm^(3)`

Discussion

46.	Copper crystallizes in a face-centred cublic lattice with a unit cell length of 361pm. What is the radius of copper atom in pm ?
Answer» 157 181 108 128 Solution :For FCC STRUCTURE, `r = ( a)/( 2 sqrt( 2)) = ( 361)/( 2 sqrt( 2)) = ( 361)/( 2 xx 1.414)` `= 127 .6 = 128` pm

Discussion

47.	Copper crystallizes in a face centred cubic lattice. Calculate the number of unit cells in 1.2g of copper. Atomic mass of copper = 63.54.
Answer» Solution :NUMBER of CU atoms in 63.54 g Cu=`6.023 XX 10^(23)` Number of atoms in 1.2 g Cu = `(6.023 xx 10^(23) xx 1.2)/(63.54) = 11.375 xx 10^(21)` atoms Number of atoms in a face centred cubic lattice = 4 `:.` Number of unit CELLS in 1.2g Cu = `(11.375 xx 10^(21))/(4)= 2.84 xx 10^(21)`

Discussion

48.	Copper crystallises with face-centred cubic unit cell. If the radius of copper atom is 127.8 pm, calculate the density of copper metal. (Atomic mass of Cu = 63.55 g/mol and Avogadro's number N_(A) = 6.02 xx 10^(23) mol^(-1))
Answer» Solution :fcc `rarr` 4 atoms = Z r = 127.8 pm `r = (a)/(2 sqrt(2))` `therefore""a = 127.8 xx 2 sqrt(2)` = 361.47 pm `d = (Z xx M)/(a^(3) xx N_(A))` `d = (4 xx 63.55 G MOL -1 )/((361.47 xx 10^(-12)m)^(3) xx 6.02 xx 10^(23) mol^(-1))` = 8.9 `gm^(-3)`

Discussion

49.	Coppercrystallisesintoa fccstructureand theunitcellhas lengthof edge 3.61 xx 10^(-8) cm.Calculate thedensity of thecopperAtomicmass ofcopperis 63.5 g mol^(-1)
Answer» Solution :Given : Crystallinestructureof Cuis FCC Edgelength=a= `3.61 xx 10^(-8) cm` Atomicmass of Cu=63.5 g `mol^(-1)` Avogadro number`=6.022 xx10^(23)mol^(-1)`Density = d= ? In fcc structurethere are8 Cuatomsat 8corners and6Cuatomsat 6facecentres . `:. ` Totalnumber of Cu ATOMS `=(1)/(8) xx 8 + (1)/(2) xx6 = 1 + 3 =4` Massof Cu atoms `=4 xx1.054 xx 10^(-22)= 4.216 xx 10^(-22)g` Mass ofunit cell= Massof 4 Cuatoms`= 4.216 xx 10^(-22) g` Volumeof unitcell =`a^(3)(3.61 xx 10^(-8))^(3) = 4.7 xx 10^(-23) cm^(3)` Densityof unit cell`= ("massof unit cell" )/( "volume ofunit cell" ) ` `:.d = (4.216xx 10^(-23))/( 4.7 xx 10^(-23))= 8.97 g cm^(-3)`

Discussion

50.	Copper crystallises into a fcc lattice with edge length 3.61 xx 10^(-8) cm. Show that the calculated density is in agreement with its measured value of 8.92 "g cm"^(-3).
Answer» Solution :Number of atoms per unit cell (Z) = 4 EDGE LENGTH (a) `= 3.61 xx 10^(-8)`cm By formula , `d = (Z xx M)/(a^3 xx N_A)` `therefore d = (4 xx 63.54)/(6.022 xx 10^(23) xx (3.61 xx 10^(-8))^3)` `therefored = 8.97 "g cm"^(-3)`.

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

Copper metal belongs to a crystal system represented by the crystal dimensions as

Copper matte is the mixture of ……………..

Copper matte is charged into a silica lined converter in the extraction of copper. What is the role of silica lining there?

Copper matte is .........

Copper is unique in 3d series. Prove this statement.

Copper is used for making wires used in electrical industry and for water and steam pipes.

Copper is very slowly oxidised on the surface in moist air, givinga green coating of vergiris is :

Copper is refined by :

Copper is purified byb electrolytic refining of blister copper. The conrect statement(s) about this process is (are)

Copperis purifiedbyelectrolyticrefiningof blistercopper. Thecorrectstatement (s) aboutthisprocessis(are).

Copper is purified by electro-refining of blister copper. The correct statement (s) about this process is (are)

Copper is purifed by electrolaytic refining of blister copper ,The correct statement (s) about this prcess is (are)

Copper is prepared as alloying element in ornamental gold. Why?

Give reason : Copper is more electro positive than silver.

Copper is mainly extracted from _________

Copper is extracted from copper pyrites ore by heatingin a blast furnace. The methodis basedon the principal that

Copper is extracted from pyrites by heating in a Bessemer converter. The method is based onthe principle that

Copperisextractedfromcopperpyritesby heatingin a bessemerconverter.The methodisbasedonthe principlethat

Copper is a stronger reducing agent than silver.

Copperisextracted from

Copper is conducting as such while copper sulphate is conducting only in molten state or in aqueous solution. Explain.

Copper (I) compounds are white and diamagnetic while copper (II) compounds are coloured and paramagnetic and form coloured compounds.Explain.

Copper has the face centred cubic structure. The coordination number of each ion is:

Copper has the face centred cubic structure. The coordination number of each ion is:a) 4b) 12c) 14d) 8

Copper from copper sulphate solution can be displaced by ………….The standared reduction potentials of some electrodes are given below: E^@(Fe^(2+),Fe) =-0.44V E^@(Zn^(2+),Zn)=-0.76 V E^@(Cu^(2+),Cu) =+0.34V E^@(Cr^(3+),Cr)=-0.74V E^@(H^+,1/2 H_2)=-0.00 V

Copper crystals have fcc unit cells: Compute the number of atoms per unit cell of copper crystal.

Copper crystals have fcc unit cells: Calculate the mass of a unit cell of copper crystal (atomic mass of copper=63.54u)

Copper crystallizes into an fec lattice with edge length of 3.61 xx 10^(-8) cm. Calculate the density of copper. [Given" " Cu = 63.5 g mol^(-1), N_(A) = 6.022 xx 10^(23) mol^(-1)]

Copper crystallizes in fcc with a unit cell length of 361 pm. What is the radius of copper atom ?

Copper crystallizes into a fcc lattice with edge length 3.61 xx 10^(-8) cm. Calculate the density of the crystal (Atomic mass of copper = 63.5 g/mol and Avogadro number = 6.022 xx 10^(23) mol^(-1))

Copper crystallizes in a face-centred cublic lattice with a unit cell length of 361pm. What is the radius of copper atom in pm ?

Copper crystallizes in a face centred cubic lattice. Calculate the number of unit cells in 1.2g of copper. Atomic mass of copper = 63.54.

Copper crystallises with face-centred cubic unit cell. If the radius of copper atom is 127.8 pm, calculate the density of copper metal. (Atomic mass of Cu = 63.55 g/mol and Avogadro's number N_(A) = 6.02 xx 10^(23) mol^(-1))

Coppercrystallisesintoa fccstructureand theunitcellhas lengthof edge 3.61 xx 10^(-8) cm.Calculate thedensity of thecopperAtomicmass ofcopperis 63.5 g mol^(-1)

Copper crystallises into a fcc lattice with edge length 3.61 xx 10^(-8) cm. Show that the calculated density is in agreement with its measured value of 8.92 "g cm"^(-3).