94420 + Interview Questions in Chemistry in Class 12

1.	{:("List-I","List-II"),("(reaction)","(Slope of the graph in Ellingham diagram)"),("1) "C_(s)+O_(2(g))rarrCO_(2(g)),"a) Positive slope"),("2) "C_((s))+O_(2(g))rarr2CO_((g)),"b) Negative slope"),("3) "2CO_((g))+O_(2(g))rarr2CO_(2(g)),"b) Almost zero"),("4) "2Fe_((s))+O_(2(g))rarr2FeO_((s)),""):}
Answer» `{:(1,2,3,4),(C,B,a,b):}` `{:(1,2,3,4),(c,b,a,a):}` `{:(1,2,3,4),(c,a,b,a):}` `{:(1,2,3,4),(a,c,b,a):}` ANSWER :B

Discussion

2.	{:("","List-I","","List-II"),((P),K_p=20 atm^(-1),(1),"No effect of pressure on the yield of the product" ),((Q),H_(2(g))+I_(2(g))hArr2HI_((g)),(2),DeltaH=DeltaE-RT),((R ),N_2+3H_2hArr2NH_3,DeltaH=-ve,(3),"Non-spontaneous process"),((S),DeltaG_(pT)gt 0,(4),k_p"decreases with temperature"):}
Answer» <P>`{:(P,Q,R,S),(2,1,4,3):}` `{:(P,Q,R,S),(2,3,1,4):}` `{:(P,Q,R,S),(3,2,1,4):}` `{:(P,Q,R,S),(2,4,1,3):}` ANSWER :C

Discussion

3.	{:("LIST - 1","LIST - 2"),("A) "SF_(6),"1) angular"),("B) "SF_(4),"2) open book"),("C) "SF_(2),"3) octahedral"),("D) "S_(2)F_(2),"4) pyramidal"),(,"5) distorted tetrahedral"):} The correct match is
Answer» `{:(A,B,C,D),(1,2,3,4):}` `{:(A,B,C,D),(4,2,5,3):}` `{:(A,B,C,D),(2,4,1,5):}` `{:(A,B,C,D),(3,5,1,2):}` ANSWER :D

Discussion

4.	{:("List - I","List - II"),("Chemical property","Structure elucidation"),("of Glucose","of Glucose"),("A) Acetylation","1) Presence of"),(,"carbonyl group"),("B) Reaction with HCN","2) Six carbon atoms"),(,"straight chain."),("C) Reaction with HI/P","3) Presence of"),(,1^(@)-"alcohol group"),("D) Oxidation","4) Presence of"),("with "HNO_(3),"5 - OH groups "):} Correct match is
Answer» `{:(A,B,C,D),(1,2,3,4):}` `{:(A,B,C,D),(4,1,2,3):}` `{:(A,B,C,D),(3,1,2,4):}` `{:(A,B,C,D),(3,2,1,4):}` ANSWER :B

Discussion

5.	{:("List - I","List - II"),("A. Schottky defect","A. AgBr"),("B. Frenkel defect","2. FeO"),("C. Metal excess defect","3. NaCl"),("D. Metal deficiency defect","4. ZnO"):}
Answer» `{:(A,B,C,D),(2,4,3,1):}` `{:(A,B,C,D),(3,1,4,2):}` `{:(A,B,C,D),(4,2,1,3):}` `{:(A,B,C,D),(1,3,2,4):}` ANSWER :(b) 3, 1, 4, 2

Discussion

6.	{:("LIST - 1","LIST - 2"),("A) Phosphorite","1) "KNO_(3)),("B) Indian salt petre","2) "Ba(NO_(3))_(2)),("C) Fluoroapatite","3) "NaNO_(3)),("D) Chile salt petre","4) "3cA_(3)Ca(PO_(4))_(2).CaF_(2)),(,"5) "Ca_(3)(PO_(4))_(2)):} The correct match is
Answer» `{:(A,B,C,D),(1,2,3,5):}` `{:(A,B,C,D),(2,4,3,1):}` `{:(A,B,C,D),(4,3,5,2):}` `{:(A,B,C,D),(5,1,4,3):}` ANSWER :D

Discussion

7.	{:("List - I","List - II"),("A. Covalent solid","1. Solid "CO_(2)),("B. Non polar molecular solid","2. SiC"),("C. Polar molecular solid","3. Solid ice"),("D. Hydrogen bonded molecular solids","4. Anthracene"):}
Answer» `{:(A,B,C,D),(2,4,1,3):}` `{:(A,B,C,D),(4,3,2,1):}` `{:(A,B,C,D),(3,1,4,2):}` `{:(A,B,C,D),(1,2,3,4):}` ANSWER :(a) 2, 4, 1, 3

Discussion

8.	{:("List I","List II"),("A) ccp","1) ABAB"),("B) hcp","2) BCC"),("C) CsCl","3) ABC ABC"):} The correct match is
Answer» `{:(A,B,C),(2,3,1):}` `{:(A,B,C),(3,1,2):}` `{:(A,B,C),(1,3,2):}` `{:(A,B,C),(3,2,1):}` ANSWER :B

Discussion

9.	{:("List - I","List - II"),("A) Crystal defect","1) Amorphous"),("B) Carborundum","2) Frenkel"),("C) Pitch","3) Covalent crystal"):} The correct match is
Answer» `{:(A,B,C),(3,1,2):}` `{:(A,B,C),(2,1,3):}` `{:(A,B,C),(2,3,1):}` `{:(A,B,C),(1,2,3):}` ANSWER :C

Discussion

10.	{:("List - I","List - II"),("A. Bragg's equation","1. "(nM)/(a^(3)N_(A))),("B. Density of unit cell","2. "("Total volume of all spheres in unit cell")/("Volume of unit cell")xx100),("C. Packing efficiency","3. "(r_(c^(+)))/(r_(A^(-)))),("D. Radius ratio","4. "nlambda=2d sin theta):}
Answer» `{:(A,B,C,D),(3,4,1,2):}` `{:(A,B,C,D),(1,2,3,4):}` `{:(A,B,C,D),(4,1,2,3):}` `{:(A,B,C,D),(2,3,4,1):}` Answer :(c )4, 1, 2, 3

Discussion

11.	{:("List-I","List-II"),("A)" CaF_(2),"1)"Na_(3)AlF_(6) (or ) 3NaFAIF_(3)),("B) Cryolite","2) Fluro apatite"),("C) "O_(2),"3) Fluorospar"),("D)" 3Ca_(3) (PO_(4)).CaF_(2),"4) Scheele"):} The correct match is
Answer» `{:(A,B,C,D),(3,1,4,2):}` `{:(A,B,C,D),(2,4,1,3):}` `{:(A,B,C,D),(1,2,3,4):}` `{:(A,B,C,D),(3,4,1,2):}` ANSWER :A

Discussion

12.	{:("List - I","List - II"),("A. Atomic solid","1. Naphthalene"),("B. Molecular crystal","2. KCl"),("C.Covalent crystal","3. Frozen elements of group 18"),("D. Ionic crystal","4. Diamond"):}
Answer» `{:(A,B,C,D),(1,2,3,4):}` `{:(A,B,C,D),(3,1,4,2):}` `{:(A,B,C,D),(4,3,2,1):}` `{:(A,B,C,D),(2,4,1,3):}` Answer :(b) 3, 1, 4, 2

Discussion

13.	{:("LIST - 1","LIST - 2"),("A) "H_(2)SO_(4),"1) "+4),("B) "H_(2)(S)_(n)O_(6),"2) "+3),("C) "H_(2)SO_(3),"3) "+2"," -2),("D) "H_(2)SO_(3),"4) "+6),(,"5) "+5","0):} The correct match is
Answer» `{:(A,B,C,D),(2,5,2,4):}` `{:(A,B,C,D),(3,2,1,4):}` `{:(A,B,C,D),(4,5,1,2):}` `{:(A,B,C,D),(2,3,1,5):}` ANSWER :C

Discussion

14.	{:("List I","List II"),("1) "sp^3,"A) Square planar"),("2) "dsp^2,"B) Octahedral"),("3) "sp^3d,"C) Tetrahedral"),("3) "d^2sp^3,"D) Trigonal bipyramidal"):}
Answer» `{:(A,B,C,D),(3,1,2,4):}` `{:(A,B,C,D),(4,2,1,3):}` `{:(A,B,C,D),(2,4,1,3):}` `{:(A,B,C,D),(2,3,1,4):}` ANSWER :C

Discussion

15.	{:("List - I","List - II"),("A) "alpha" and "beta-D" Glucose","1) Mutarotation"),("B) "(+) and (-)" Glucose","2) Enantiomers"),("C) D- and L-notation","3) Anomers"),("D) "alpha-" form "overset(rarr)(larr)beta-" form","4) Configurational isomers"):}
Answer» `{:(A,B,C,D),(2,3,4,1):}` `{:(A,B,C,D),(2,3,1,4):}` `{:(A,B,C,D),(3,2,4,1):}` `{:(A,B,C,D),(3,2,1,4):}` ANSWER :C

Discussion

16.	List-I {:((P) H_(2)O gtgt H_(2)S lt H_(2)Se lt H_(2)Te,(1)"Bond angle"),((Q)H_(2)O lt H_(2)S lt H_(2)Se lt H_(2)Te, (2)"melting point and boilinng point"),((R )H_(2)O gt H_(2)S gt H_(2)Se gt H_(2)Te,(3)"acidity"):}
Answer» P-3,Q-1, R-2 P-2,Q-3,R-1 P-1,Q-2,R-3 P-2,Q-1,R-3 ANSWER :B

Discussion

17.	Match the following {:("List-I (Type of mineral)","List-II"),((1)"Oxide",(a)"Kaolinite"),((2)"Carbonate",(b)"Calamine"),((3)"Sulphide",(c)"Copper glance"),((4)"Silicate",(d)"Cuprite"):}
Answer» `{:(1,2,3,4),(d,B,C,a):}` `{:(1,2,3,4),(b,d,a,c):}` `{:(1,2,3,4),(a,b,c,d):}` `{:(1,2,3,4),(b,a,c,d):}` ANSWER :A

Discussion

18.	{:("List I", "List II"),("Property", "Order"),("(A) M.Pts", (1) I_2 < Br_(2) < F_2 < Cl_2),("(B) B.Pts", (2) Cl > F > Br > I),("(C) Electron affinity", (3) Cl_2 > Br_2 > F_2 > I_2),("(D) Bond dissociation energy" , (4) F_2 > Cl_2 > I_2 > Br_2):} The correct match is
Answer» `{:(A,B,C,D),(5,5,2,3):}` `{:(A,B,C,D),(2,5,3,4):}` `{:(A,B,C,D),(1,2,3,4):}` `{:(A,B,C,D),(5,2,3,4):}` ANSWER :A

Discussion

19.	{:(,"List - I", "List- II"),(,"(P)" HCHO + NH_(3) , (1) "Polymer"),(,"(Q)" "Urea + Formaldehyde" , (2) "Hypnotic"),(,"(R)" "Urea + Malonicester" , (3) "Insectiside"),(,"(S)" CHCl_(3) + conc. HNO_(3) , (4) "Urinaryantiseptic"):}
Answer» <P>`{:(,"P","Q","R","S"),((A),2,3,4,1):}` `{:(,"P","Q","R","S"),((B),1,4,2,3):}` `{:(,"P","Q","R","S"),((C),4,1,3,2):}` `{:(,"P","Q","R","S"),((D),4,1,2,3):}` ANSWER :D

Discussion

20.	{:("LIST-I",, "List -II"),((A)"Terfenadine " ,, (1) 3 "Benzene rings") ,((B) "Bromopheniramine " ,, (2) 1 "Pyridene ring"),((C) "Ranitidine",, (3) 1 "Furanring"):}
Answer» `{:(1,2,3),(A,B,C):}` `{:(1,2,3),(B,C,A):}` `{:(1,2,3),(C,A,B):}` `{:(1,2,3),(A,C,B):}` ANSWER :A

Discussion

21.	{:("LIST - 1","LIST - 2"),("A) Positive catalyst","1) "H_(2)S" to iron in Habers process"),("B) Negative catalyst","2) 'CO' to preparation of "SO_(3)),("C) Catalytic poison","3) Glycerol to prevent decomposition of "H_(2)O_(2)),("D) Promoter","4) "MnO_(2)" in the decomposition of "KClO_(3)),(,"5) Mo to Fe in Habers process"):} The correct match is
Answer» `{:(A,B,C,D),(4,3,5,2):}` `{:(A,B,C,D),(3,4,2,1):}` `{:(A,B,C,D),(4,3,1,5):}` `{:(A,B,C,D),(1,5,3,2):}` ANSWER :C

Discussion

22.	{:("LIST-I",,"LIST-II"),((1)"Iodoform",, (A)"Narrow spectrum" ),((2) "Dil .aq. Boric acid",,(B) "Weak antiseptic for eyes"),((3) "Penicillin-G",,(C) "Antiseptic for wounds" ), ((4)"Chloramphenicol" ,, (D) "Broad spectrum antiboitic"):}Correct matching is
Answer» ` {:(A,B,C,D),(1,3,4,2):}` ` {:(A,B,C,D),(3,2,1,4):}` ` {:(A,B,C,D),(3,2,1,4):}` ` {:(A,B,C,D),(3,1,2,4):}` ANSWER :B

Discussion

23.	{:("List I " ,"List - II"),((A) "Griganard reagent ",(1) H_2//Pd-BaSO_4),((B)"Clemmensen ",(2) N_2H_4\|KOH\|"Glycol"),("reduction",),((C)"Rosenmund",(3) CH_3MgX),("reduction",),((D)"Wollff - Kishner",(4) Zn- Hg\| conc. HCl),("reduction",(5) H_2\|"Ni"):} The correct answer is :
Answer» `{:(A,B,C,D),(3,4,2,1):}` `{:(A,B,C,D),(3,4,1,2):}` `{:(A,B,C,D),(2,1,4,5):}` `{:(A,B,C,D),(5,3,2,1):}` ANSWER :B

Discussion

24.	{:("List-I",,"LIST-II"),((A) "Antipyretic " ,, (1)" Epsom salt " ),((B) "Laxative ",,(2)"Chloretone "),((C) "Hypnotic",,(3)"Paracetamol"),((D) "Both analgesic & Antipyretic",,(4) "Aspirin"):} The correct match is
Answer» `{:(A,B,C,D),(1,2,3,4):}` `{:(A,B,C,D),(3,1,2,4):}` `{:(A,B,C,D),(4,2,1,3):}` `{:(A,B,C,D),(4,3,2,1):}` ANSWER :C

Discussion

25.	List-I contains the reactants and the List-II contains the particulars about the reaction products. Match the entries of List-I with the correct entris of the List-II using the codes as given below . {:("List"-I,,"List"-II),((a)NH_(4)Cl","Na_(3)[Co(NO_(2))_(6)],,(p)"Red complex"),((b)MgCl_(2)","Na_(2)HPO_(4)","NH_(3),,(q)"Brown complex"),((c)CuSO_(4)","K_(4)[Fe(CN)_(6)],,(r)"Yellow complex"),((d)C_(4)H_(8)O_(2)N_(2)","NiCl_(2)","NH_(3),,(s)"White crystalline compound"):} Code :
Answer» `{:(,"(a)","(b)","(C)","(d)"),(,"(r)","(s)","(q)","(p)"):}` `{:(,"(a)","(b)","(c)","(d)"),(,"(p)","(q)","(r)","(s)"):}` `{:(,"(a)","(b)","(c)","(d)"),(,"(s)","(r)","(q)","(p)"):}` `{:(,"(a)","(b)","(c)","(d)"),(,"(p)","(q)","(r)","(s)"):}` Solution :`(a)""3NH_(4)^(+)+[Co(NO_(2))_(2)]^(3-)RARR(NH_(4))_(3)[Co(NO_(2))_(6)darr("yellow")` `(b)""Mg^(2+)+NH_(3)+HPO_(4)^(2-)rarrMg(NH_(4))PO_(4)darr("while")` `(c )""Cu^(2+)+[Fe(CN)_(6)]^(4-)rarrCu_(2)[Fe(CN)_(6)]darr("brown")` `(d)""2DMG+NI^(2+)overset(NH_(3)(aq.))rarr[Ni(DMG)_(2)]darr("red")`

Discussion

26.	List-I contians reaction and List-II contains major product. Match each reaction in List-I with one or more products in ListII and choose the correct option.
Answer» `Pto1,5,Qto2,Rto3,STO4` `Pto1,4,Qto2,Rto4,Sto3` `Pto1,4,Qto1,2,Rto3,4,Sto4` `Pto4,5,Qto4,Rto4,Sto3,4` Solution :EXPLANATION: . . CORRECT ANSWER is b

Discussion

27.	Mention the factors affecting the rate of reaction.
Answer» Solution :The FOUR factors which affect the RATE of REACTION are as follows : (i) Concentration of reactants (ii) Presence of catalyst (III) Temperature of reaction (iv) Surface area of the reactant.

Discussion

28.	{:("List-A(Preparation of a","List-B(Always true)"),((A)"Binary liquid mixture with stonger interaction than in constituent liquids",(p)(DeltaP)_("mixing") lt 0 "Where P is vapour pressure "),((B)"Binary liquid mixture with weaker interaction than in constituent liquids",(q)(DeltaG)_("mixing")lt0),((C)"Binary of a nonvolatile electrolyte in a solvent (true solution)",(r)(DeltaH)_("mixing") lt 0),((D)"Mixture of a nonvolatile electrolyte in a solvent (true solution)",(s)(DeltaS)_("mixing")gt0):}
Answer» ANSWER :A::B::C::D

Discussion

29.	List any four vitamins . Mention the chief sourceand functionsof twoof them.
Answer» Solution :Vitamin A , Vitamin `B_(1)`,Vitamin C and Vitamin D . Vitamin A can beobtained from fish LIVER oil , carrots , butter and milk . Deficiency of thisvitamin causesnightblindess. Vitamin `B_(1)` canbe obtained from yeast milk , green vegetableand cereals . Deficiency ofthisvitamincauses beri- beri (LOSS of appetite and retarded growth). Vitamin C can beobtainedfrom CITRUS FRUITS, amla and green leafy vegtables . Itsdeficiencycauses scurvy i.e., bleeding of gums . Vitamin D can beobtaiendfrom exposure to sunlight, fish and egg yolk. Deficiency of thisvitamin causedrickets (bone deformities ) and osteomalacia (soft bones and joints pains in adults).

Discussion

30.	List any four factors on which the colligative properties of a solution depend.
Answer» SOLUTION :Colligative properties of a solution depend ori the following factors : (i) Conce1.tration of SOLUTE particles in solution. (ii) Relative number of solute and solvent molecules. (III) Relative number of moles of solute and solvent. (iv) Lowering of vapour pressure of a solution, DEPRESSION in freezing point of a solution, elevation in boiling point of a solution and osmotic pressure are colligative properties.

Discussion

31.	{:("List-A(aqueous solution)","List-B(Property among the list A)"),((A)0.1m K_(4)[Fe(CN)_(6)](alpha=1),(p)"Highest vapour pressure of solution "),((B)0.2m Hg(CN_(2))(K_(4)[Fe(CN)_(6)](alpha=1)=a),(q)"Ieal colligative property"),((C)1m"glucose",(r)"Highest boiling point"),((D)0.5m MgCl_(2)(alpha=0.75),(s)"Highest Vanthoff factor"):}
Answer» ANSWER :A::B::C::D

Discussion

32.	{:("LIST - 1","LIST -2"),((I) CH_3CHOrarr"Aldol" ,(A)LiAlH_4),((II) CH_3COOHrarrCH_3CH_2OH,(B) Zn - Hg),((III) CH_3COCH_3rarrCH_3CH_2CH_3,(C) NaOCl),((IV) CH_3CHOrarrCHCl_3,(D) NaOH),(,(E) KMnO_(4)","H^(+)):} The correct match is
Answer» `{:(I,II,III, IV),(E,B,A,C):}` `{:(I,II,III, IV),(D,A,B,C):}` `{:(I,II,III, IV),(B,E,A,D):}` `{:(I,II,III, IV),(D,B,E,D):}` Answer :B

Discussion

33.	{:("LIST-1","LIST-2"),((A)"Pyrolusite",(1)FeS_(2)),((B)"Heamatite",(2)ZnS),((C )"Iron Pyrities",(3)Fe_(2)O_(3)),((D)"Zinc blende",(4)MnO_(2)),(,(5)Fe_(3)O_(4)):} The correct match is
Answer» `{:(A,B,C,D),(4,5,1,3):}` `{:(A,B,C,D),(3,5,1,2):}` `{:(A,B,C,D),(4,3,1,2):}` `{:(A,B,C,D),(3,4,1,2):}` ANSWER :C

Discussion

34.	{:("LIST-1","LIST-2"),((A)"Mole fraction",(1)"No. of g equivalents in 1000ml of solution"),((B)"Molarity",(2)"Always less than one"),((C)"Normality",(3)"Greater than or equal to molarity"),((D)"Molality",(4)"No. of g moles of present in 1000ml solute "),(.,"No.of g moles of solute 1kg of solvent"):} The correct match is
Answer» `{:(A,B,C,D),(1,2,3,4):}` `{:(A,B,C,D),(2,3,1,5):}` `{:(A,B,C,D),(1,4,2,3):}` `{:(A,B,C,D),(2,4,3,5):}` ANSWER :D

Discussion

35.	{:("LIST-1","LIST-2"),((A)"Gaseous solution",(1)"German silver"),((B)"Liquid solution",(2)"Milk"),((C)"Solid solution",(3)"Sand in water"),((D)"Colloidal solution",(4)"Aqueous Alcoholic solution"),(.,(5)"Air"):}
Answer» `{:(A,B,C,D),(5,4,1,2):}` `{:(A,B,C,D),(1,3,2,5):}` `{:(A,B,C,D),(4,2,5,1):}` `{:(A,B,C,D),(2,3,1,4):}` ANSWER :A

Discussion

36.	{:(LIST-1,LIST-2),("A) "N_2O,"1) "sp^2" and planar triangle"),("B) "HNO_2,"2) Nitrite and nitro form"),("C) "NO_3-,"3) "sp^3" and tetrahedron"),("D) "HNO_4,"4) Laughing gas"),(,"5) Peroxy bond"):}
Answer» `{:(,A,B,C,D),("1)",1,2,3,4):}` `{:(,A,B,C,D),("2)",3,2,4,1):}` `{:(,A,B,C,D),("3)",2,5,3,4):}` `{:(,A,B,C,D),("4)",4,2,1,5):}` ANSWER :D

Discussion

37.	{:("LIST - 1","LIST-2"),("A) Colloidal","1) Liquid or solid or gas"),("B) Crystalloid","2) "1m mu-1mu),("- 14 C) True solution","3) Does not show Tyndall effect"),("D) Disperse phase","4) Urea"),(,"5) Either liquid or gas but should not be solid"):}
Answer» A-2, B-4, C-5, D-3 A-2, B-3, C-5, D-1 A-5, B-1, C-3, D-2 A-2, B-4, C-3, D-1 ANSWER :D

Discussion

38.	Liquor ammonia is:
Answer» AMMONIUM hydroxide Liquefied AMMONIA gas Concentrated SOLUTION of `NH_3` in water A solution of `NH_3` in alcohol Answer :C

Discussion

39.	Liquor ammonia bottles are opened only after cooling. This is beacause
Answer» it is a mild EXPLOSIVE it is a corrosive LIQUID it is a lachrymatory it GENERATES high VAPOUR PRESSURE Solution :Liquor ammonia has high vapour pressure, so cooling is done to lower the vapour pressure, otherwise the gases rushes out with mild explosion.

Discussion

40.	Liquids A and B form ideal solution over the entire range of composition . At temperature, T, equimolar binary solution of liquids A and B has vapour pressure 45 torr. At the same temperature, a new solution of A and B having molefraction x_(A) and x_(B) respectively, has vapour pressure of 22.5 torr. The value of x_(A)//x_(B) in the new solution is
Answer» Solution :Apply the EQUATION `P=x_(A)P_(A)(0)+x_(B)P_(B)^(0)` twice

Discussion

41.	Liquids A and B from an ideal solution and the former has stronger intermolecular forces. If X_A and X'_A are the mole fractions of A in the solution and vapour inequilibrium, then
Answer» <P>`(X'_A)/(X_A) = 1` `(X'_A)/X_A GT 1` `(X'_A)/(X_A)=1` `X'_A + X_A =1` Solution :`x_A^.= p_A/p = (p_A^@ x_A)/p rArr x_A^./x_A = (p_A^@)/p LT 1` (since the liquid A is less valatile,`p_A^@ lt P`)

Discussion

42.	Liquids 'A' and 'B' form an ideal solution. If the mole- fraction of 'A' in liquid and vapour forms at equilibrium is 0.4 and 0.6, respectively, the value of (P_(A)^(0))/(P_(B)^(0)) is.
Answer» ANSWER :B

Discussion

43.	Liquids A and B form an ideal mixture, in which the mole fraction of A is 0.25. At temperature T, a small quantity of the vapour in equilibrium with the liquid is collected and condensed. This process is repeated for a second time withfirst condensate. The second condensate now contains 0.645 mole fraction of A. Calculate the ratio (P_(A)^(@)//P_(B)^(@)). What will be the mole fraction of B in the third condensate?
Answer» <P> Solution :MOLE fraction of `A (chi_(A))=0.25` Mole fraction of `B (chi_(B))=0.75` After first CONDENSATION Partial presssure of `A (p_(A))=P_(A)^(@)chi_(A)=P_(A)^(@)xx0.25` Partial presssure of `B (p_(B))=P_(B)^(@)xx0.75` `:. p_(A)/p_(B)=P_(A)^(@)/P_(B)^(@)XX(0.25)/(0.75)` After secondcondensation Mole fraction of `A (chi_(A))=0.645` Mole fraction of `B(chi_(B))=1-0.645=0.355` Ratio of partial PRESSURES `p_(A)^"/p_(A)^"=(p_(A)^(@)/p_(B)^(@))^(2)xx0.25/0.75=0.645/0.345` `:.(p_(A)^(@)/p_(B)^(@))^(2)=0.645/0.345xx0.75/0.25` `:.P_(A)^(@)/P_(B)^(@)=2.33` After thirdcondensation `p_(A)^"'/p_(A)^"'=(p_(A)^(@)/p_(B)^(@))^(3)xx0.25/0.75=(2.33)^(3)xx0.25/0.75=4.242` `:.`Mole fraction of B `p_(B)^"'/p_(B)^"'+p_(B)^"'=1/5.42=0.191`=Mole fraction of `B`

Discussion

44.	Which of the following liquids can climb up the wall of the glass vesselin which it is placed ?
Answer» Alcohol Liquid He Liquid `N_2` Water Answer :B

Discussion

45.	Liquid washing detergent are
Answer» ANIONIC types cationic types non-ionic types soap Answer :C

Discussion

46.	Liquid solutions can be classified as ideal and non-ideal solution onthe basis of Rault's law. Write two properties of and ideal solution
Answer» Solution :Formation of an ideal solution does not INVOLVE any change in the VOLUME or enthalpy `DELTA H=0` (Enthalpy of mixing will be zero) `Delta V = 0`(Change in volume on mixing will be zero)

Discussion

47.	Liquid solutions can be classified as ideal and non-ideal solution onthe basis of Rault's law. What type of deviation is shown by a mixture of chloroform and acetone ? Give reason.
Answer» Solution :negative Deviation : Due to INTERMOLECULAR hydrogen BONDING, the ESCAPING tendency EITHER of the liquid molecules BECOMES less.

Discussion

48.	Liquid phase nitration of propane mamly gives
Answer» `CH_(3) - OVERSET(NH_(3)) overset(\|)(CH) = CH_(3)` `CH_(3) - overset(NH_(3)) overset(\|)(CH) = CH_(2)-NO_(2)` `CH_(3) - CH_(2) - CH_(2) - NO_(2)` `overset(NO_(2))overset(\|)(CH_(2)) - overset(NO_(2))overset(\|)(CH) -overset(NO_(2))overset(\|)(CH_(2))` ANSWER :D

Discussion

49.	Liquid solutions can be classified as ideal and non-ideal solution onthe basis of Rault's law. What are ideal solutions ?
Answer» Solution :Ideal solution is DEFINED as a solution that obey.s Rault.s LAW at all CONCENTRATIONS and TEMPERATURE

Discussion

50.	Liquid sodim finds use in nuclear reactors. Its function is
Answer» To COLLECT the reaction products To act as a heat EXCHANGE or COOLANT To absorb the neutrons in order to control the chain reaction To act as a moderator which slows down the neutrons Solution :Liquid sodium are used in nuclear reactors as heat EXCHANGER or coolant

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

{:("List-I","List-II"),("(reaction)","(Slope of the graph in Ellingham diagram)"),("1) "C_(s)+O_(2(g))rarrCO_(2(g)),"a) Positive slope"),("2) "C_((s))+O_(2(g))rarr2CO_((g)),"b) Negative slope"),("3) "2CO_((g))+O_(2(g))rarr2CO_(2(g)),"b) Almost zero"),("4) "2Fe_((s))+O_(2(g))rarr2FeO_((s)),""):}

{:("","List-I","","List-II"),((P),K_p=20 atm^(-1),(1),"No effect of pressure on the yield of the product" ),((Q),H_(2(g))+I_(2(g))hArr2HI_((g)),(2),DeltaH=DeltaE-RT),((R ),N_2+3H_2hArr2NH_3,DeltaH=-ve,(3),"Non-spontaneous process"),((S),DeltaG_(pT)gt 0,(4),k_p"decreases with temperature"):}

{:("LIST - 1","LIST - 2"),("A) "SF_(6),"1) angular"),("B) "SF_(4),"2) open book"),("C) "SF_(2),"3) octahedral"),("D) "S_(2)F_(2),"4) pyramidal"),(,"5) distorted tetrahedral"):} The correct match is

{:("List - I","List - II"),("A. Schottky defect","A. AgBr"),("B. Frenkel defect","2. FeO"),("C. Metal excess defect","3. NaCl"),("D. Metal deficiency defect","4. ZnO"):}

{:("LIST - 1","LIST - 2"),("A) Phosphorite","1) "KNO_(3)),("B) Indian salt petre","2) "Ba(NO_(3))_(2)),("C) Fluoroapatite","3) "NaNO_(3)),("D) Chile salt petre","4) "3cA_(3)Ca(PO_(4))_(2).CaF_(2)),(,"5) "Ca_(3)(PO_(4))_(2)):} The correct match is

{:("List - I","List - II"),("A. Covalent solid","1. Solid "CO_(2)),("B. Non polar molecular solid","2. SiC"),("C. Polar molecular solid","3. Solid ice"),("D. Hydrogen bonded molecular solids","4. Anthracene"):}

{:("List I","List II"),("A) ccp","1) ABAB"),("B) hcp","2) BCC"),("C) CsCl","3) ABC ABC"):} The correct match is

{:("List - I","List - II"),("A) Crystal defect","1) Amorphous"),("B) Carborundum","2) Frenkel"),("C) Pitch","3) Covalent crystal"):} The correct match is

{:("List - I","List - II"),("A. Bragg's equation","1. "(nM)/(a^(3)N_(A))),("B. Density of unit cell","2. "("Total volume of all spheres in unit cell")/("Volume of unit cell")xx100),("C. Packing efficiency","3. "(r_(c^(+)))/(r_(A^(-)))),("D. Radius ratio","4. "nlambda=2d sin theta):}

{:("List-I","List-II"),("A)" CaF_(2),"1)"Na_(3)AlF_(6) (or ) 3NaFAIF_(3)),("B) Cryolite","2) Fluro apatite"),("C) "O_(2),"3) Fluorospar"),("D)" 3Ca_(3) (PO_(4)).CaF_(2),"4) Scheele"):} The correct match is

{:("List - I","List - II"),("A. Atomic solid","1. Naphthalene"),("B. Molecular crystal","2. KCl"),("C.Covalent crystal","3. Frozen elements of group 18"),("D. Ionic crystal","4. Diamond"):}

{:("LIST - 1","LIST - 2"),("A) "H_(2)SO_(4),"1) "+4),("B) "H_(2)(S)_(n)O_(6),"2) "+3),("C) "H_(2)SO_(3),"3) "+2"," -2),("D) "H_(2)SO_(3),"4) "+6),(,"5) "+5","0):} The correct match is

{:("List I","List II"),("1) "sp^3,"A) Square planar"),("2) "dsp^2,"B) Octahedral"),("3) "sp^3d,"C) Tetrahedral"),("3) "d^2sp^3,"D) Trigonal bipyramidal"):}

{:("List - I","List - II"),("A) "alpha" and "beta-D" Glucose","1) Mutarotation"),("B) "(+) and (-)" Glucose","2) Enantiomers"),("C) D- and L-notation","3) Anomers"),("D) "alpha-" form "overset(rarr)(larr)beta-" form","4) Configurational isomers"):}

List-I {:((P) H_(2)O gtgt H_(2)S lt H_(2)Se lt H_(2)Te,(1)"Bond angle"),((Q)H_(2)O lt H_(2)S lt H_(2)Se lt H_(2)Te, (2)"melting point and boilinng point"),((R )H_(2)O gt H_(2)S gt H_(2)Se gt H_(2)Te,(3)"acidity"):}

Match the following {:("List-I (Type of mineral)","List-II"),((1)"Oxide",(a)"Kaolinite"),((2)"Carbonate",(b)"Calamine"),((3)"Sulphide",(c)"Copper glance"),((4)"Silicate",(d)"Cuprite"):}

{:("List I", "List II"),("Property", "Order"),("(A) M.Pts", (1) I_2 < Br_(2) < F_2 < Cl_2),("(B) B.Pts", (2) Cl > F > Br > I),("(C) Electron affinity", (3) Cl_2 > Br_2 > F_2 > I_2),("(D) Bond dissociation energy" , (4) F_2 > Cl_2 > I_2 > Br_2):} The correct match is

{:(,"List - I", "List- II"),(,"(P)" HCHO + NH_(3) , (1) "Polymer"),(,"(Q)" "Urea + Formaldehyde" , (2) "Hypnotic"),(,"(R)" "Urea + Malonicester" , (3) "Insectiside"),(,"(S)" CHCl_(3) + conc. HNO_(3) , (4) "Urinaryantiseptic"):}

{:("LIST-I",, "List -II"),((A)"Terfenadine " ,, (1) 3 "Benzene rings") ,((B) "Bromopheniramine " ,, (2) 1 "Pyridene ring"),((C) "Ranitidine",, (3) 1 "Furanring"):}

{:("LIST-I",,"LIST-II"),((1)"Iodoform",, (A)"Narrow spectrum" ),((2) "Dil .aq. Boric acid",,(B) "Weak antiseptic for eyes"),((3) "Penicillin-G",,(C) "Antiseptic for wounds" ), ((4)"Chloramphenicol" ,, (D) "Broad spectrum antiboitic"):}Correct matching is

{:("List I " ,"List - II"),((A) "Griganard reagent ",(1) H_2//Pd-BaSO_4),((B)"Clemmensen ",(2) N_2H_4|KOH|"Glycol"),("reduction",),((C)"Rosenmund",(3) CH_3MgX),("reduction",),((D)"Wollff - Kishner",(4) Zn- Hg| conc. HCl),("reduction",(5) H_2|"Ni"):} The correct answer is :

{:("List-I",,"LIST-II"),((A) "Antipyretic " ,, (1)" Epsom salt " ),((B) "Laxative ",,(2)"Chloretone "),((C) "Hypnotic",,(3)"Paracetamol"),((D) "Both analgesic & Antipyretic",,(4) "Aspirin"):} The correct match is

List-I contians reaction and List-II contains major product. Match each reaction in List-I with one or more products in ListII and choose the correct option.

Mention the factors affecting the rate of reaction.

List any four vitamins . Mention the chief sourceand functionsof twoof them.

List any four factors on which the colligative properties of a solution depend.

{:("LIST - 1","LIST -2"),((I) CH_3CHOrarr"Aldol" ,(A)LiAlH_4),((II) CH_3COOHrarrCH_3CH_2OH,(B) Zn - Hg),((III) CH_3COCH_3rarrCH_3CH_2CH_3,(C) NaOCl),((IV) CH_3CHOrarrCHCl_3,(D) NaOH),(,(E) KMnO_(4)","H^(+)):} The correct match is

{:("LIST-1","LIST-2"),((A)"Pyrolusite",(1)FeS_(2)),((B)"Heamatite",(2)ZnS),((C )"Iron Pyrities",(3)Fe_(2)O_(3)),((D)"Zinc blende",(4)MnO_(2)),(,(5)Fe_(3)O_(4)):} The correct match is

{:("LIST-1","LIST-2"),((A)"Gaseous solution",(1)"German silver"),((B)"Liquid solution",(2)"Milk"),((C)"Solid solution",(3)"Sand in water"),((D)"Colloidal solution",(4)"Aqueous Alcoholic solution"),(.,(5)"Air"):}

{:(LIST-1,LIST-2),("A) "N_2O,"1) "sp^2" and planar triangle"),("B) "HNO_2,"2) Nitrite and nitro form"),("C) "NO_3-,"3) "sp^3" and tetrahedron"),("D) "HNO_4,"4) Laughing gas"),(,"5) Peroxy bond"):}

{:("LIST - 1","LIST-2"),("A) Colloidal","1) Liquid or solid or gas"),("B) Crystalloid","2) "1m mu-1mu),("- 14 C) True solution","3) Does not show Tyndall effect"),("D) Disperse phase","4) Urea"),(,"5) Either liquid or gas but should not be solid"):}

Liquor ammonia is:

Liquor ammonia bottles are opened only after cooling. This is beacause

Liquids A and B from an ideal solution and the former has stronger intermolecular forces. If X_A and X'_A are the mole fractions of A in the solution and vapour inequilibrium, then

Liquids 'A' and 'B' form an ideal solution. If the mole- fraction of 'A' in liquid and vapour forms at equilibrium is 0.4 and 0.6, respectively, the value of (P_(A)^(0))/(P_(B)^(0)) is.

Which of the following liquids can climb up the wall of the glass vesselin which it is placed ?

Liquid washing detergent are

Liquid solutions can be classified as ideal and non-ideal solution onthe basis of Rault's law. Write two properties of and ideal solution

Liquid solutions can be classified as ideal and non-ideal solution onthe basis of Rault's law. What type of deviation is shown by a mixture of chloroform and acetone ? Give reason.

Liquid phase nitration of propane mamly gives

Liquid solutions can be classified as ideal and non-ideal solution onthe basis of Rault's law. What are ideal solutions ?

Liquid sodim finds use in nuclear reactors. Its function is