52671 + Interview Questions in Chemistry in Class 11

1.	Combustion of fuel in a bomb calorimeter is an example of _____
Answer» SOLUTION :ISOCHORIC PROCESS

Discussion

2.	Combustion of benzene gives products as
Answer» `6CO_2 + 6H_2O` `3CO_2 + 6H_2O` `CO_2 + 6H_2O` `6CO_2 + 3H_2O` SOLUTION :`C_X H_Y + [X + (Y)/(4)]O_2 to XCO_2 + YH_2O`

Discussion

3.	Combustion of a gaseous hydrocarbon give 0.25 g water. What will be empricial formula of the hydrocarbon ?
Answer» `C_(2)H_(4)` `C_(2)H_(6)` `C_(3)H_(4)` `C_(7)H_(8)` Solution :`H_(2)O= 0.72 G = (0.72)/(18) = 0.04 "mole" H_(2)O` `CO_(2) = 3.08g = (3.08)/(44) = 0.07 "mole" CO_(2)` `:.` Mole of `C= 0.07` `:.` Mole of `H = 2 (0.04)= 0.08` `:.` PROPORTION of `C : H` `= 0.07 : 0.08` Empirical formula `=C_(7)H_(8)`

Discussion

4.	Combustion of alkane (Petrol) causes pollution how ?
Answer» Solution :Octane is a component of PETROL, complete and INCOMPLETE combustion of petrol is occurred according to following reaction : `C_(8)H_(18) + (17)/(2)O_(2) overset("Incomplete combustion")rarr 8CO + 9H_(2)O` `C_(8)H_(18) + (25)/(2)O_(2) overset("complete combustion")rarr 8CO_(2) + 9H_(2)O` CO is poisonous and can form complex with blood. In vechicles, on complete combustion of petrol gives CO and `CO_(2)` which causes pollution.

Discussion

5.	Combustion of 2.24 its ethane at STP requires
Answer» 7.84 Its of `O_(2)` 0.35 moles of `O_(2)` 11.2 gms of `O_(2)` 5.6 Its of `O_(2)` at STP SOLUTION :`C_(2)H_(6)+(7)/(2)O_(2)rarr2CO_(2)+3H_(2)O` `22.4L(7)/(2)xx22.4L`

Discussion

6.	Combustion of 0.42g of a compound gave 0.924gCO_(2) and 0.243g H_(2)O. Due to distillation of 0.208g of compound with NaOH, ammonia evolved required 30mL of (N)/(20)H_(2)SO_(4) for complete neutralization. Vapour density of the compound is 69.5. What is the percentage composition of hydrogen in the compound?
Answer» 6.43 10.09 60 23.48 Answer :A

Discussion

7.	Combustion of 0.42g of a compound gave 0.924gCO_(2) and 0.243g H_(2)O. Due to distillation of 0.208g of compound with NaOH, ammonia evolved required 30mL of (N)/(20)H_(2)SO_(4) for complete neutralization. Vapour density of the compound is 69.5. What is the value of 'n' for the given compound? where n = ("Molecular mass")/("Empirical formula mass")
Answer» 2 3 1 4 Answer :C

Discussion

8.	Combustion of 0.42g of a compound gave 0.924gCO_(2) and 0.243g H_(2)O. Due to distillation of 0.208g of compound with NaOH, ammonia evolved required 30mL of (N)/(20)H_(2)SO_(4) for complete neutralization. Vapour density of the compound is 69.5. What is the percentage composition of nitrogen in the compound?
Answer» 23.48 10.09 6.43 60 Answer :B

Discussion

9.	Combustion of 0.42g of a compound gave 0.924gCO_(2) and 0.243g H_(2)O. Due to distillation of 0.208g of compound with NaOH, ammonia evolved required 30mL of (N)/(20)H_(2)SO_(4) for complete neutralization. Vapour density of the compound is 69.5. Percentage composition of carbon in the compound is...
Answer» 6.43 22.48 60 10.09 Answer :C

Discussion

10.	Combustion of 0.42g of a compound gave 0.924gCO_(2) and 0.243g H_(2)O. Due to distillation of 0.208g of compound with NaOH, ammonia evolved required 30mL of (N)/(20)H_(2)SO_(4) for complete neutralization. Vapour density of the compound is 69.5. The compound has empirical formula:
Answer» `C_(7)H_(9)O_(2)N` `C_(6)H_(5)NO_(2)` `C_(3)H_(7)-CONH_(2)` `NH_(2)-OVERSET(O)overset(\|\|)(C)-NH_(2)` Answer :A

Discussion

11.	Combustion enthalpy of carbon is .-x. kJ, Enthalpy of formation of water is .-y. kJ and combustion enthalpy of methane is .-z. kJ calculate the enthalpy of formation of methane.
Answer» `(-x-y+z)` kJ `(-z+2y-x)` kJ `(-x-2y+z)` kJ `(-x-2y-z) kJ Solution :ENTHALPY of COMBUSTION reaction of carbon : (i) `C_((s)) + O_(2(g)) = CO_(2(g)) , DELTA H_((i)) = -x` kJ Enthalpy of formation of WATER : (ii) `H_(2(g)) + (1)/(2) O_(2(g)) = H_(2) O_((l)) , Delta H_(ii) =-y "kJ"` Combustion enthalpy of methane : (iii) `CH_(4(g)) + 2O_(2(g)) = CO_(2(g)) + 2H_(2) O_((l)) DeltaH_((iii)) =z "kJ"` Enthalpy of formation of methane : (iv) `C_((s)) + 2H_(2(g)) = CH_(4(g)), Delta H_((iv)) = ?` According to Hess. rule : (equation) (i)) + (2 · equation (ii)) - (equation (iii)) = equation (iv) eq. (i) : `C_((s)) + O_(2(g)) = CO_(2(g)), DeltaH_((i)) =-x "kJ"` eq. (ii) `:2H_(2(g)) + O_(2(g)) = 2H_(2) O_((l)) , DeltaH_((ii)) = -2y "kJ"` eq. (iii) : `[-CH_(4(g)) + 2O_(2(g)) = CO_(2(g)) + 2H_(2) O_((l)),DeltaH_((iii)) = -z "kJ"`] eq. (iv) : `C_((s)) + 2H_(2(g)) to CH_(4(g)) , DeltaH_((iv)) = DeltaH_((iv)) = (-x-2y+z)` kJ

Discussion

12.	Combustion enthalpy of carbon, Hydrogen and Methane at 25°C temperature are 395.5 KJ mol""^(1-) , -284.8 kJ mol""^(-1) and -890.4 "kJ mol"^(-1) respectively. Calculate the standard enthalpy of formation of methane for the same temperature.
Answer» `890.4` Kj mol`""^(-1)` `-298.8` KJ mol`""^(-1)` `-74.7` KJ mol`""^(-1)` `-107.7` KJ mol`""^(-1)` Solution :Combusion reaction of Carbon : `C_((s) ) + O_(2(g)) to CO_(2(g))` `Delta H_(1) = -395.5 "KJ mol"^(-1)` Combusion reaction of HYDROGEN : `H_(2(g)) + (1)/(2) O_(2(g)) to H_(2) O_((l))` `Delta H_(2) = -284.8 "KJ mol"^(-1)` Combusion of Methane : `CH_(4(g)) + 2O_(2(g)) to CO_(2(g)) + 2H_(2) O_((l))` `DeltaH_(3) = -890.4 "KJ mol"^(-1)` Reaction of formation of Methane : `C_((s)) + 2H_(2(g)) to CH_(4(g)) Delta H= (?)` `=-395.5 -2 XX 284.8 - 890.4` `=-74.7 "KJ mol"^(-1)`

Discussion

13.	Combustion enthalpies of methane and ethane are -210k. "cal mol"^(-1) and -368 k. "cal mol"^(-1). Combustion enthalpy of Decane is ......... .
Answer» `-158 "k. cal"` `-1632 "k. cal"` `-1700 "k.cal"` given mettre is not complete Solution :Combustion enthalpy of ethane `C_(2) H_(6) = - 368 "k cal mol"^(-1)` Combustion enthalpy of METHANE `CH_(4) = -210 "k cal mol"^(-1)` When, `CH_(4) to C_(2) H_(6)`is produced, one `- CH_(2)` is increased. Increase in combustion enthalpy by INCREASING `- CH_(2) , - 210- (-368) = + 158 "k cal per" CH_(2)` There is difference of NINE `CH_(2)` between `C_(10) H_(22) and CH_(4)`. THEREFORE, change in combustion enthalpy will be increase of nine `CH_(2)` `9 xx 158 = 1422` K cal per nine `CH_(2)` `therefore` Combustion energy of decane= sum of enthalpies of methane and nine `- CH_(2)` `= 210+ 1422` `= 1632 "K cal mol"^(-1)` `rArr` Combustion enthalpy of Decane `Delta H_("combustion") ("Decane")` `= - 1632 "K cal mol"^(-1)`

Discussion

14.	Combustion of 0.277g of an organic compound gave 0.66g carbondioxide and 0.337g water. Vapour density of the compound is equal to 37. Calculate its molecular formula.
Answer» ANSWER :`C_(4)H_(10)O`

Discussion

15.	Combustion of 0.202 g of a carbon compound gave 0.361 g of carbon dioxide and 0.147g of water. Determine the empirical formula of the compound.
Answer» SOLUTION :`%C = (0.361xx12xx100)/(0.202xx44) = 48.76% , %H = (0.147xx2xx100)/(0.202xx18) = 8.07% , %O = 100-56.83 = 43.17` C : H : O = `(48.76)/(12) : (8.07)/(1) : (43.17)/(16) = 4.06 : 8.07 : 2.7 = 3:6:2:` The empirical formula of the compound is `C_(3)H_(6)O_(2)`.

Discussion

16.	Combination that obeys Dalton's law A = CO "" B = CI_2 ""C = F_2 "" D = Xe
Answer» A, B B,C B, D A, C ANSWER :B

Discussion

17.	Column matching prolems each column may have more than one answer.
Answer» ANSWER :A::B::C::D

Discussion

18.	{:("Column-l ","Column-II "),("(Gas) ","(Order of "T_B "Boyle Temp) (1.= min, 5 = max) "),("A)"He,"P) 3 "),("B)"CH_4 ,"Q) 5"),("C)" H_2,"R) 1 "),("D)" N_2 ,"S) 4"),("E)" NH_3 ,"T) 2 "):}
Answer» SOLUTION :`T_b UARR IMPLIES a uarr implies ` more IMF `:. T_b` of `NH_3 > CH_4 > N_2 > H_2 > He`.

Discussion

19.	{:(,"Column I(Types of titration)",,"Column II (Indicator used)",),((A),"Strong acid vs strong base",(p),"Methyl orange",),((B),"Strong acid vs weak base",(q),"Methyl red",),((C),"Weak acid vs strong base",(r),"Phenolphthalein",),((D),"Weak acid vs weak base",(s),"Bromothymol blue",):}
Answer» ANSWER :(A-p, Q, R, s ; B-p, q, s ; C-r, s ; D-s)

Discussion

20.	{:(,"Column I(Molecular orbital)",,"Column II (Nodal planes present,Symmetry)"), ((A),sigma_(2s),(p),"0"),((B),sigma_(2p_(z)) ,(q),"1"),((C),pi _(2p_(x))^(),(r),"2"),((D),pi _(2p_(y))^(),(s),"Gerade"):} (Take Z-axis as the internuclear axis)
Answer» ANSWER :(A-p,s ;B-q ;C-q,s ; D-r,s)

Discussion

21.	{:("Column -I","Column -II"),("Tupe of packing","void volume"),(A.hcp,p . 0.38),(B. c cp,q . 0.48),(C. b c c ,r 0.22),(D. sc ,s. 0.66),("E. dx (Diamond cubic)",):}
Answer» Solution :(a-r,b-r) HCP and ccp, closest PACKED structure, Volume occuped =0.78 Void volume=100.78=0.22 (c-p) For BCC, volume occupied=0.62 void volume=1-0.62=0.38 (d-q) For sc, volume occupied=0.52 void volume =1-0.52=0.48 (e-s) For dc, volume occupied=0.34 void volume=1-0.34=0.66

Discussion

22.	{:(,"Column - I",,"Column - II"),(,"(Methods of separation)",,"(Compounds)"),((A),"Separated by treatment with dil. NaOH",(P),"Toluence and aniline"),((B),"Extraction with dil. HCl, a compound",(Q),"Toluene and phenol passes into the aqueous layer in the form of hydrochloride salt and recovered by neutralisation"),((C ),"Separated by "NaHCO_(3)" solution, a",(R ),"Diethyl ether and chlorobenzene compound forms salt and is recovered after acidification"),((D),"Separated by conc. "H_(2)SO_(4)" ,which dissolves a compound and reconverted from solution by dilution with "H_(2)O,(S),"O - Cresol and benzoic acid"):}
Answer» SOLUTION :METHODS of SEPERATION.

Discussion

23.	{:("Column I",,,,"Column II"),("Chemical equilirium ",,,,"(p)Dynamic"),("Physical equilibrium",,,,"(q) Reversible chamical change"),("Ionic equilibrium ",,,,"(r) Reversible physical change"),("Equilibrium constant",,,,"(s) Affected by change in temperature"):}
Answer» ANSWER :`(##DIN_OBJ_CHM_V01_C2_2_E01_247_A01##)`

Discussion

24.	{:(,"Column - I",,"Column - II"),((A),"Sublimation",(P),"Ether + Toluene"),((B),"Distillation",(Q),"o-nitrophenol + p-nitrophenol"),((C ),"Vacuum distillation",(R ),"Benzoic acid + Benzaldehyde"),((D),"Steam distillation",(S),"Glycerol and aniline"):}
Answer» Solution :SUBLIMATION - Benzoic ACID + BENZALDEHYDE Distillation - ETHER + Toluene Vacuum distillation - Glycerol and aniline Steam distillation - o-nitrophenol + p-nitrophenol

Discussion

25.	{:(,"Column I",,"Column II"),((A),"Solubility of "Hg_(2)Cl_(2) "in" 0.1 " M NaCl solution".,(p),10K_(sp)),((B),"Solubility of "PbI_(2) " in 0.01 M KI solution",(q),100K_(sp)),((C),"Solubility of "Ag_(2)CrO_(4) "in 0.25 M" K_(2)CrO_(4) "solution".,(r),10000K_(sp)),((D),"Solubility ofcalcium oxalate in 0.1 M oxalic acid aolution.",(s),sqrt(K_(sp))):}
Answer» A-q, B-r, C-s, D-p A-r, B-q, C-p, D-s A-q, B-p, C-s, D-r A-p, B-r, C-s, D-q Solution : A. `Hg_(2)Cl_(2) hArrHg_(2)^(2+) + 2 CL^(-)` `K_(sp)=[Hg_(2)^(2+)][Cl^(-)]^(2)=S (0.1 + 2 S)^(2) ~~ (0.1)^(2)S` `:. S = 100 K_(sp)` Br. `PbI_(2) hArr Pb^(2+) + 2 I^(-)` `K_(sp) = [Pb^(2+)][I^(-)]^(2)=S (0.01 + 2S)^(2) ~~ S (0.01)^(2)` ` = 10^(-4)S` `:. S = 10^(4) K_(sp)` C. `Ag_(2)CeO_(4) hArr 2 Ag^(+) + CrO_(4)^(2-)` `K_(sp) = [ Ag^(+)]^(2) [CrO_(4)^(2-)]` `=(2S)^(2)(0.25+S) ~~ (2S)^(2) (0.25)` or `S=sqrt(K_(sp))` D. `CaC_(2)O_(4) hArr Ca^(2+) + C_(2)O_(4)^(2-)` `K_(sp)=[Ca^(2+)][C_(2)O_(4)^(2-)]` `=S(0.1+S)~~0.1S or S = 10 K_(sp)`

Discussion

26.	{:(,"Column I",,"Column II"),((A),"Shows inert pair effect",(p),"InCl"),((B),"Shows " ppi-ppi " back bonding",(q),Ga),((C),"Shows disproportionation reaction",(r ),Na(SiH_(3))_(3)),((D),"Shows " ppi-dpi " back bonding",(s),BF_(3)):}
Answer» A-p,B-r,C-q,D-s A-r,B-p,C-q,D-s A-q,B-s,C-p,D-r A-s,B-q,C-p,D-r Answer :C

Discussion

27.	{:(,"Column-I",,"Column-II"),((a),"Reversible isothermal expansion of an ideal gas",(p),w=2.330"nRTlog"((V_(2))/V_(1))),((b),"Reversible adiabatic compression of an ideal gas",(q),PV'"cosntant"),((c),"Irrevesible adiabatic expansion of anideal gas",(r),w = (nR)/((gamma-1)) (T_(2) - T_(1))),((d),"Irrevesiable isothermal compression of an ideal gas",(s),DeltaH = 0):}
Answer» ANSWER :`(a-p, s);(b-q,R);(c-r);(d-s)`

Discussion

28.	{:("Column I","Column II"),((A)PCl_(5),(p)"Angular"),((B)IF_(7),(q)"Pyramidal"),((C)H_(3)O^(+),(r)"Trigonal bipyramidal"),((D)ClO_(2),(s)"Pentagonal bipyramidal"):}
Answer» <P>`A-r,B-s,C-q,D-p` `A-r,B-q,C-p,D-s` `A-p,B-s,C-q,D-r` `A-s,B-p,C-r,D-q` Solution :`A(PCl_(5))-gamma("trigonal bipyramid"),B(IF_(7))-` s (pentagonal bipyramid), `C(H_(3)O^(+))-2NO_(2)+H_(2)Otounderset("(Reducing agent")(HNO_(2))+Hoverset(+5)NO_(3)` q (pyramidal) , `D(ClO_(2))-p("angular")`

Discussion

29.	If A={0,pi/6,pi/4,pi/3,pi/2} and f:Ato B is a surjection defined by f(x)=cosx then find B.
Answer» ANSWER :A-S; B-PQT; C-R; D-PQT

Discussion

30.	{:(,"Column-I",,"Column-II"),("A)","One gram molecules of oxygen gas","P)","one mole of "H_(2)),("B)","Gram molar volume of "H_(2),"Q)","one mole of "O_(2)),("C)","44 gm of "CO_(2),"R)","22.4lit at STP"),("D)","18 gm water","S)",3N_(A)" atoms"):}
Answer» SOLUTION :A) 1 gm MOLECULE `O_(2)` = 1 mole `O_(2)` = 22.4 lit at STP B) gram molar of `H_(2)` = 1 mole = 22.4 lit at STP C) 44 gm = 1 mole of `CO_(2)` = 1 mole of `O_(2)` = 22.4 lit. at STP = `N_(0)` molecules = `3N_(0)` atoms D) 18 gm `H_(2)O` = 1 mole of `H_(2)O` = 1 mole of `H_(2)=3N_(0)` atoms

Discussion

31.	{:(,"Column I",,"Column II",),(A,"Nascent hydrogen",p,"Permutit",),(B,"Hard water",q,"Molecular"H_(2) "with excess energy",),(C,"Hydrogen peroxide",r,"Reduces" FeCl_(3) "to" FeCl_(2),),(D,"Dihydrogen",s,"Reduces" Cr_(2)O_(7)^(-) "to" Cr^(3+),):}
Answer» ANSWER :`(##DIN_OBJ_CHM_V03_C11_E01_274_A01##)`

Discussion

32.	{:(,"Column-I",,"Column-II"),("A)",N_(2),"P)","40% carbon by mass"),("B)",CO,"Q)","Empirical formula "CH_(2)O),("C)",C_(6)H_(12)O_(6),"R)","Vapour density : 14"),("D)",CH_(3)COOH,"S)",14N_(A)" electrons in a mole"):}
Answer» Solution :Vapour density of nitrogen = 14 1 Mole nitrogen `(N_(2))=6.23xx10^(23)` molecules `=14xx6.023xx10^(23)` electrons Vapour density of CO = 14 1 mole CARBON monoxide (CO) `=6.023xx10^(23)` molecules `=14xx6.023xx10^(23)` electrons `C_(6)H_(12)O_(6)%` carbon by MASS = `(72)/(180)xx100=40` Empirical FORMULA = `CH_(2)O` `CH_(3)COOH%` carbon by mass `(24)/(60)xx100=40` Empirical formula = `CH_(2)O`

Discussion

33.	{:("Column -I","Column-II"),((A)MgCI_(2),(P)1),((B)AIF_(3),(Q)3),((C)Na_(2)SO_(4),(R)-(2)((D)TiF_(4),(S)4):}
Answer» ANSWER :A-S; B-Q; C-P; D-R

Discussion

34.	{:(,"Column-I",,"Column-II",),((A),"Law of conservation of mass",(p),CH_(4) "has carbon and hydrogen in" 3:1 "mass raio",),((B),"Law of multiple proportion",(q),10mL N_(2) "combines with" 30mL "of" H_(2) "to form" 20mL "of" NH_(3),),((C),"Law of definite proportion",(r),"S and" O_(2) "combine to form" SO_(2) "and" SO_(3),),((D),"Law of reciprocal proportion",(s),"In" H_(2)S "and"SO_(2) "mass ratio ofH and O w.r.t. sulphure is" 1:16 "hence in" H_(2)O "mass ratio of H and O is" 1:8.,),((E),"Gay Lussac's Law",(t),4.2 g MgCO_(3) "gives" 2.0 g "residue on heating",):}
Answer» ANSWER :A::B::C::D

Discussion

35.	{:(,"Column I",,"Column II"),((A),"Isothermal process",(p),q=DeltaU),((B),"Adiabatic process",(p),w=-pPDeltaV),((C ),"Isobaric process",(r),w=DeltaU),((D),"Isochoric process",(s),w=nRT ln(V_(2)//V_(1))):}(a) A -s,B-q,C-r,D-p (b) A-s,B-r,C-q,D-p(c )A-p, B-r,C-q,D-s (d) A-r,B-p,C-s,D-q
Answer» ANSWER :B

Discussion

36.	{:(,"Column I",,"Column II"),((A),"Inorganic benzene",(p),"An allotrope of carbon"),((B),"Fulerene",(q),"Orthosilicate"),((C),"Phenacite",(r),"An ore of boron"),((D),"Colemanite",(s),"Borazine" (B_(3)N_(3)H_(6))):}
Answer» A-s,B-p,C-r,D-q A-p,B-s,C-q,D-r A-q,B-r,C-s,D-p A-s,B-p,C-q,D-r Answer :D

Discussion

37.	{:(,"Column-I",,"Column-II"),((a),"Heating of an ideal gas at constant pressure",(p),DeltaH=nC_(p.m,)DeltaTne0),((b),"Compression of liquid at constant temperature",(q),DeltaU=0),((c),"Reversible process for anideal gas at constant temperature",(r),DeltaG=V.DeltaP),((d),"Adiabatic free expansion of an ideal gas",(s),DeltaG=nRTln(P_(2)/P_(1))):}
Answer» <P> ANSWER :`(a-p);(b-r);(c-q,p);(d-q,s)`

Discussion

38.	{:("Column I","Column II"),((A)H_(3)PO_(3)overset(Delta)to,(p)"One of the products acts as a reducing agent"),((B)PCl_(3)+H_(2)Ooverset(Delta)to,(q)"One of the products is a tribasic non-reducing acid."),((C)N_(2)+H_(2)Oto,(r)"Dehydration"),((D)HNO_(3)+P_(4)O_(10)overset(Delta)to,(s)"In one of the products , central atom has +5 oxidations state."):}
Answer» Solution :`4H_(3)PO_(3)overset(Delta)toH_(3)overset(+5)PO_(4)+underset("Reducing agent")(overset(-3)PH_(3))""or3NO_(2)+H_(2)Otounderset("Reducing agent")(NO)+2Hoverset(+5)NO_(3)` `PCl_(3)+3H_(2)Ooverset(Delta)tounderset("Reducing agent")(H_(3)PO_(3))+3HCl""4HNO_(3)+P_(4)O_(10)overset(Delta)to2N_(2)overset(+5)O_(5)+4Hoverset(+5)PO_(3)`

Discussion

39.	{:(,"Column - I",,"Column - II"),((A),"Graphite",(P),"Layered structure"),((B),"Boric acid",(Q),"Delocalization of electrons"),((C ),"Borazole",(R ),"Electrical conductor"),((D),"Boron nitride",(S),"Hydrogen bonds"):}
Answer» Solution :(A) Graphite `to` layered structure, delocalozation of electron, ELECTRICAL conductor. (B) Boric ACID `to` layered structure, HYDROGEN BONDS. (C ) Borazole `to` Delocalization of ELECTRONS. (D) Boron nitride `to` layered structure, delocalization of electron.

Discussion

40.	{:(,"Column - I",,"Column - II"),((A),"glycerol",(P),"Steam distillation"),((B),"o-nitrophenol",(Q),"Beilstein's test"),((C ),"Anthracene",(R ),"Vaccum distillation"),((D),"Halogens",(S),"Sublimation"):}
Answer» Solution :`{:("GLYCEROL",-,"Vacuum distillation"),("o-nitrophenol",-,"STEAM distillation"),("ANTHRACENE",-,"Sublimation"),("HALOGENS",-,"Beilstein.s test"):}`

Discussion

41.	{:(,"Column-I",,"Column-II"),("A)","Cyclick silicates","P)","Tetrahedral hybridization"),("B)","Single chain silicate","Q)","Si-Obonds are 50% ionic and 50% covalent"),("C)","Pyro silicates","R)","General formula is "(SiO_(3))_(n)^(2n-)),("D)","Sheet silicates","S)","Two oxygen atoms per (two dimensional tetrahedron are shared)"):}
Answer» Solution :`RARR` All silicates G.F `SiO_(4)^(2)` with tetrahedral shape & `sp^(3)` hybridisation `rarr` In each `SiO_(2) - SiO_(2)-50%` ionic 50% COVALENT `rarr` Cyclic & single CHAIN silicates have `(SiO_(3))_(N)^(-2n)` has general FORMULA & two oxygen atoms are shared by each unit.

Discussion

42.	{:("Column-I", "Column-II"),((A) O_(2)^(+),(P) "bond order "gt=1),((B) He_(2)^(+) ,(Q) "Paramagnetic "),((C)C_(2)^(2-) ,(Q) "Homonuclear atomic orbital combine with each other "),((D) NO, (S) "Outermost electron in antibonding molecular orbital "):}
Answer» ANSWER :A-PRT; B-PT; C-PS; D-RS

Discussion

43.	{:(,"Column-I",,"Column-II"),("A)",Co,"P)","Neutral"),("B)",PbO_(2),"Q)","Amphoteric"),("C)",GeO,"R)","Reducing agent"),("D)" ,SnO,"S)","Oxidizing agent"):}
Answer» Solution :A) CHARGE `.+2.` B) Non-metalic nature & O.S. is `+4`. C) Non-metalic nature & O.S. is `+2` D) Non-metalic nature & O.S. is `+2 `

Discussion

44.	{:(,"Column - I",,"Column - II"),((A),"Boric acid",(P),Na_(2)[B_(4)O_(5)(OH)_(4)]),((B),"Kernite",(Q),K_(2)O.3Al_(2)O_(3).6SiO_(2).2H_(2)O),((C ),"Feldspar",(R ),Al_(2)O_(3).2SiO_(2).2H_(2)O),((D),"Mica",(S),KAlSi_(3)O_(8)),((E ),"Kadonite",(T),H_(3)BO_(3)),((F),"Diaspar",(U),Al_(2)O_(3)H_(2)O):}
Answer» Solution :(A) Boric acid - formula is `H_(3)BO_(3)` (B) Kernite - formula is `Na_(2)[B_(4)O_(5)(OH)_(4)]` (C ) Feldspar - formula is `Kal Si_(3)O_(8)` (D) MICA - formula is `K_(2)O.3Al_(2)O_(3).6SiO_(2).2H_(2)O` (E ) Kadonite - formula is `Al_(2)O_(3).2SiO_(2).2H_(2)O` (F) Diaspar - formula is `Al_(2)O_(3)H_(2)O`

Discussion

45.	{:(,"Column I",,"Column II"),((A),Bi^(3+) rarr (BiO)^(+),(p),"Heat"),((B),[AlO_(2)]^(-) rarr Al(OH)_(3),(q),"Hydrolysis"),((C ),SiO_(4)^(4-) rarr Si_(2)O_(7)^(6-),(r ),"Acidification"),((D),(B_(4)O_(7))^(2-)rarr [B(OH)_(3)],(s),"Dilution by water"):}
Answer» Solution :A-q `Bi^(3+) +H_(2)O overset("Hydrolysis")hArr underset("Bismuth oxycation")(BiO^(+)) + 2H^(+)` `B-s` `AlO_(2)^(-) + 2H_(2)O overset("Dilution")underset("with water")rarr Al(OH)_(3) + OH^(-)` C-p, r `underset("Orthosilicate")(2SiO_(4)^(4-)) + 2H^(+) overset((i)Acidification)underset((ii) DELTA)rarrunderset("Pyrosilicate")(Si_(2)O_(7)^(6-)) + H_(2)O` D-q, r `B_(4)O_(7)^(2-)+ 2H^(+) overset("Acidification")rarr H_(2)B_(4)O_(7)` `H_(2)B_(4)O_(7) + 5H_(2)O overset("Hydrolysis")rarr 4H_(3)BO_(3)`

Discussion

46.	{:(,"Column I",,"Column II"),((A),B_(2)H_(6),(p),"Borax"),((B),BF_(3),(q),"Lewis acid"),((C ),AlCl_(3),(r ),ppi-ppi " back bonding "),((D),H_(3)BO_(3),(s),NaBH_(4)):}
Answer» ANSWER :(A-s; B-Q,R; C-q ; D-p,q)

Discussion

47.	{:(,"Column - I",,"Column - II"),((A),B_(2)H_(6)+NH_(3)overset("under different")underset("temperatures")rarr,(P),B_(2)H_(6)),((B),2BF_(3)+6LiH rarr,(Q),"Borazine"),((C ),"Two electron four centre bond",(R ),AlCl_(3) ("vapour")),((D),sp^(3)" hybrid orbitals",(S),"Inorganic graphite"):}
Answer» Solution :(A) `B_(2)H_(6)+6NH_(3)overset(450 K)underset(-12 H_(2))rarr underset("Inorganic benzene")underset("Borazine (or)")(2B_(3)N_(3)H_(6))overset(Delta)rarr underset("Inorganic graphite")((BN)_(X))` (B)`2BF_(3)+6LiH overset(450 K)rarr underset("Diborane")(B_(2)H_(6))+6LiF` (C ) Two electron three centre bond `to B_(2)H_(6)` (D) `sp^(3)` hybrid orbit also`to B_(2)H_(6), AlCl_(3)` (VAPOUR).

Discussion

48.	{:(,"Column I",,"Column II"),((A),"An element with +1 stable oxidation state",(p),"lead"),((B),"A neutral oxide",(q),"Dry ice"),((C),"An element with stable +2 oxidationstate",(r),"Thallium"),((D),"Solid carbon dioxide",(s),"Carbon monoxides"):}
Answer» A-p,B-q,C-r,D-s A-r,B-s,C-p,D-q A-r,B-p,C-q,D-s A-q,B-s,C-r,D-p Answer :B

Discussion

49.	{:(,"Column-I",,"Column-II"),((a),"A process carried out infinitesimally",(p),"Adiabatic"),((b),"A process inwhich no heat enters or leaves the system",(q),DeltaG=0),((c),"A process carried out at constant temperature",(r),"Sublimation"),((d),"A process in equilibrium",(s),DeltaE=0DeltaH=0),((e),A(s)rarrA(g),(t),"Reversible"),((f),"Cyclic process",(u),"Isotermal"):}
Answer» ANSWER :`(a-t);(b-p);(c-u);(d-q);(e-r);(f-q,s)`

Discussion

50.	{:("Column-I","Column-II"),((A) " Tetrahedral bonded by edge ",(P)P_(2)O_(8)^(4-)),((B) "Tetrahedral bonded by their center",(Q) B_(2)H_(6)),((C) "Tetrahedral bonded by common comer ",(R)1:1 "adduct of " BF_(3) "and " NH_(3)) ,((D) "Tetrahedral bonded by individual comer",(S) Cr_(2)O_(7)^(2-)),("",(T) "Single chain silicate "):}
Answer» ANSWER :A-Q; B-R; C-ST; D-P

Discussion

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Column matching prolems each column may have more than one answer.

{:("Column-l ","Column-II "),("(Gas) ","(Order of "T_B "Boyle Temp) (1.= min, 5 = max) "),("A)"He,"P) 3 "),("B)"CH_4 ,"Q) 5"),("C)" H_2,"R) 1 "),("D)" N_2 ,"S) 4"),("E)" NH_3 ,"T) 2 "):}

{:(,"Column I(Types of titration)",,"Column II (Indicator used)",),((A),"Strong acid vs strong base",(p),"Methyl orange",),((B),"Strong acid vs weak base",(q),"Methyl red",),((C),"Weak acid vs strong base",(r),"Phenolphthalein",),((D),"Weak acid vs weak base",(s),"Bromothymol blue",):}

{:(,"Column I(Molecular orbital)",,"Column II (Nodal planes present,Symmetry)"), ((A),sigma_(2s),(p),"0"),((B),sigma_(2p_(z)) ,(q),"1"),((C),pi _(2p_(x))^(**),(r),"2"),((D),pi _(2p_(y))^(**),(s),"Gerade"):} (Take Z-axis as the internuclear axis)

{:("Column -I","Column -II"),("Tupe of packing","void volume"),(A.hcp,p . 0.38),(B. c cp,q . 0.48),(C. b c c ,r 0.22),(D. sc ,s. 0.66),("E. dx (Diamond cubic)",):}

{:("Column I",,,,"Column II"),("Chemical equilirium ",,,,"(p)Dynamic"),("Physical equilibrium",,,,"(q) Reversible chamical change"),("Ionic equilibrium ",,,,"(r) Reversible physical change"),("Equilibrium constant",,,,"(s) Affected by change in temperature"):}

{:(,"Column - I",,"Column - II"),((A),"Sublimation",(P),"Ether + Toluene"),((B),"Distillation",(Q),"o-nitrophenol + p-nitrophenol"),((C ),"Vacuum distillation",(R ),"Benzoic acid + Benzaldehyde"),((D),"Steam distillation",(S),"Glycerol and aniline"):}

{:(,"Column I",,"Column II"),((A),"Shows inert pair effect",(p),"InCl"),((B),"Shows " ppi-ppi " back bonding",(q),Ga),((C),"Shows disproportionation reaction",(r ),Na(SiH_(3))_(3)),((D),"Shows " ppi-dpi " back bonding",(s),BF_(3)):}

{:("Column I","Column II"),((A)PCl_(5),(p)"Angular"),((B)IF_(7),(q)"Pyramidal"),((C)H_(3)O^(+),(r)"Trigonal bipyramidal"),((D)ClO_(2),(s)"Pentagonal bipyramidal"):}

If A={0,pi/6,pi/4,pi/3,pi/2} and f:Ato B is a surjection defined by f(x)=cosx then find B.

{:(,"Column-I",,"Column-II"),("A)","One gram molecules of oxygen gas","P)","one mole of "H_(2)),("B)","Gram molar volume of "H_(2),"Q)","one mole of "O_(2)),("C)","44 gm of "CO_(2),"R)","22.4lit at STP"),("D)","18 gm water","S)",3N_(A)" atoms"):}

{:(,"Column I",,"Column II",),(A,"Nascent hydrogen",p,"Permutit",),(B,"Hard water",q,"Molecular"H_(2) "with excess energy",),(C,"Hydrogen peroxide",r,"Reduces" FeCl_(3) "to" FeCl_(2),),(D,"Dihydrogen",s,"Reduces" Cr_(2)O_(7)^(-) "to" Cr^(3+),):}

{:(,"Column-I",,"Column-II"),("A)",N_(2),"P)","40% carbon by mass"),("B)",CO,"Q)","Empirical formula "CH_(2)O),("C)",C_(6)H_(12)O_(6),"R)","Vapour density : 14"),("D)",CH_(3)COOH,"S)",14N_(A)" electrons in a mole"):}

{:("Column -I","Column-II"),((A)MgCI_(2),(P)1),((B)AIF_(3),(Q)3),((C)Na_(2)SO_(4),(R)-(2)((D)TiF_(4),(S)4):}

{:(,"Column I",,"Column II"),((A),"Isothermal process",(p),q=DeltaU),((B),"Adiabatic process",(p),w=-pPDeltaV),((C ),"Isobaric process",(r),w=DeltaU),((D),"Isochoric process",(s),w=nRT ln(V_(2)//V_(1))):}(a) A -s,B-q,C-r,D-p (b) A-s,B-r,C-q,D-p(c )A-p, B-r,C-q,D-s (d) A-r,B-p,C-s,D-q

{:(,"Column I",,"Column II"),((A),"Inorganic benzene",(p),"An allotrope of carbon"),((B),"Fulerene",(q),"Orthosilicate"),((C),"Phenacite",(r),"An ore of boron"),((D),"Colemanite",(s),"Borazine" (B_(3)N_(3)H_(6))):}

{:(,"Column - I",,"Column - II"),((A),"Graphite",(P),"Layered structure"),((B),"Boric acid",(Q),"Delocalization of electrons"),((C ),"Borazole",(R ),"Electrical conductor"),((D),"Boron nitride",(S),"Hydrogen bonds"):}

{:(,"Column - I",,"Column - II"),((A),"glycerol",(P),"Steam distillation"),((B),"o-nitrophenol",(Q),"Beilstein's test"),((C ),"Anthracene",(R ),"Vaccum distillation"),((D),"Halogens",(S),"Sublimation"):}

{:("Column-I", "Column-II"),((A) O_(2)^(+),(P) "bond order "gt=1),((B) He_(2)^(+) ,(Q) "Paramagnetic "),((C)C_(2)^(2-) ,(Q) "Homonuclear atomic orbital combine with each other "),((D) NO, (S) "Outermost electron in antibonding molecular orbital "):}

{:(,"Column-I",,"Column-II"),("A)",Co,"P)","Neutral"),("B)",PbO_(2),"Q)","Amphoteric"),("C)",GeO,"R)","Reducing agent"),("D)" ,SnO,"S)","Oxidizing agent"):}

{:(,"Column - I",,"Column - II"),((A),"Boric acid",(P),Na_(2)[B_(4)O_(5)(OH)_(4)]),((B),"Kernite",(Q),K_(2)O.3Al_(2)O_(3).6SiO_(2).2H_(2)O),((C ),"Feldspar",(R ),Al_(2)O_(3).2SiO_(2).2H_(2)O),((D),"Mica",(S),KAlSi_(3)O_(8)),((E ),"Kadonite",(T),H_(3)BO_(3)),((F),"Diaspar",(U),Al_(2)O_(3)H_(2)O):}

{:(,"Column I",,"Column II"),((A),Bi^(3+) rarr (BiO)^(+),(p),"Heat"),((B),[AlO_(2)]^(-) rarr Al(OH)_(3),(q),"Hydrolysis"),((C ),SiO_(4)^(4-) rarr Si_(2)O_(7)^(6-),(r ),"Acidification"),((D),(B_(4)O_(7))^(2-)rarr [B(OH)_(3)],(s),"Dilution by water"):}

{:(,"Column I",,"Column II"),((A),B_(2)H_(6),(p),"Borax"),((B),BF_(3),(q),"Lewis acid"),((C ),AlCl_(3),(r ),ppi-ppi " back bonding "),((D),H_(3)BO_(3),(s),NaBH_(4)):}

{:(,"Column - I",,"Column - II"),((A),B_(2)H_(6)+NH_(3)overset("under different")underset("temperatures")rarr,(P),B_(2)H_(6)),((B),2BF_(3)+6LiH rarr,(Q),"Borazine"),((C ),"Two electron four centre bond",(R ),AlCl_(3) ("vapour")),((D),sp^(3)" hybrid orbitals",(S),"Inorganic graphite"):}

{:(,"Column I",,"Column II"),((A),"An element with +1 stable oxidation state",(p),"lead"),((B),"A neutral oxide",(q),"Dry ice"),((C),"An element with stable +2 oxidationstate",(r),"Thallium"),((D),"Solid carbon dioxide",(s),"Carbon monoxides"):}

{:(,"Column I(Molecular orbital)",,"Column II (Nodal planes present,Symmetry)"), ((A),sigma_(2s),(p),"0"),((B),sigma_(2p_(z)) ,(q),"1"),((C),pi _(2p_(x))^(),(r),"2"),((D),pi _(2p_(y))^(),(s),"Gerade"):} (Take Z-axis as the internuclear axis)