Transweb Educational Services Pvt. Ltd Tel:

Size: px

Start display at page:

Download "Transweb Educational Services Pvt. Ltd Tel:"

Amberly Parks
5 years ago
Views:

1 . Which of the following will not exist in zwitter ionic form at p = 7? () () (3) C C S 3 Ans. () The atom of amide is not basic. (4) S 3. A sample of acl 3 is converted by heat to acl with a loss of 0.6 g of oxygen. The residue is dissolved in water and precipitated as AgCl. The mass of AgCl (in g) obtained will be : (Given: Molar mass of AgCl = 43.5 g mol ) () 0.35 () 0.54 (3) 0.4 (4) 0.48 acl 3 acl + 3 n acl n acl = = n acl AgCl PAC of Cl n acl = n AgCl 300 = n AgCl 3 = Weight of AgCl = [ ] = = 0.48 g 0.6 g 3 = or which of the following reactions, is equal to U? () (g) + 3 (g) 3 (g) () I(g) (g) + I (g) (3) S (g) + (g) S 3 (g) (4) (g) 4 (g) Ans. () = U + n g RT I(g) (g) + I (g) n g = ( + ) = 0 Page o.

2 4. 5 decomposes to and and follows first order kinetics. After 50 minutes, the pressure inside the vessel increases from 50 mm g to 87.5 mm g. The pressure of the gaseous mixture after 00 minute at constant temperature will be : () 36.5 mm g () 06.5 mm g (3) 75.0 mm g (4) 6.5 mm g Ans. () 5 + t = p t = 50 min. 50p p = 5 p t = 00 min. 50 p p =.5 p 50 p + p + = p 50 + = p = 37.5 p = minute is half life period for 00 minute ( half life) 50 p =.5 = 5 p = 37.5 mm of g Total pressure at 00 minute p = 50 p + p + 3p = 50 + = = = 06.5 mm of g 5. In the molecular orbital diagram for the molecular ion,, the number of electrons in the p molecular orbital is : () 0 () (3) 3 (4) s * s s * s x p,,,, [ p = ] umber of electron in p z is y p z Page o.

3 6. Which of the following will most readily give the dehydrohalogenation product? Br Br Br () Ph () (3) (4) Br Ans. () ere dehydrohalogenation goes by Ecb and most stable carbanion formation is favoured in A. 7. Identify the pair in which the geometry of the species is T-shape and square-pyramidal, respectively : () ICl and ICl 5 3 () I and I 4 (3) Cl 3 and I (4) Xe and Xe 4 Xe Xe T-Shape Xe 4 Xe 8. The major product of the following reaction is : Me Me (i) ClC C CCl (ii) AlCl 3 (anhyd.) () () Me Me (3) Ans. () Me The reactant undergoes acylation first followed by substitution Intramolecular. (I) (II) 9. Ans. () In hydrogen azide (above) the bond orders of bonds (I) and (II) are : (I) (II) (I) (II) () < > () > > (3) > < (4) < < (4) == or Page o.3

4 0. or a +, Mg +, and ; the correct order of increasing ionic radii is : () < < a + < Mg + () a + < Mg + < < (3) Mg + < a + < < (4) Mg + < < a + < Ans. (3) Isoelectronic series : Mg + < a + < < When negative charge increase, increase the radius of ion.. The increasing order of nitration of the following compounds is : Cl C 3 C 3 (a) (b) (c) (d) () (a) < (b) < (d) < (c) () (a) < (b) < (c) < (d) (3) (b) < (a) < (c) < (d) (4) (b) < (a) < (d) < (c) Ans. () ere the aniline is the least reactive due to formation of anilinium ion in acidic medium.. The correct match between items of List-I and List-II is : List-I List-II (A) Coloured impurity (P) Steam distillation (B) Mixture of o-nitrophenol and p-nitrophenol (Q) ractional distillation (C) Crude aphtha (R) Charcoal treatment (D) Mixture of glycerol and sugars (S) Distillation under reduced pressure () (A)-(R), (B)-(S), (C)-(P), (D)-(Q) () (A)-(P), (B)-(S), (C)-(R), (D)-(Q) (3) (A)-(R), (B)-(P), (C)-(Q), (D)-(S) (4) (A)-(R), (B)-(P), (C)-(S), (D)-(Q) Ans. (3) 3. The copolymer formed by addition polymerization of styrene and acrylonitrile in the presence of peroxide is : 5 C 6 C C CC C () CCC () C 6 5 C C 3 n n 5 C 6 C (3) C CCC n C (4) CC C C Ans. () C 6 5 n Page o.4

5 4. Which of the following is a Lewis acid? () P 3 () 3 (3) a (4) B(C 3 ) 3 3 C C 3 B C 3 (6e ) (Lewis Acid) 5. Which of the following statements about colloids is alse? () When silver nitrate solution is added to potassium iodide solution a negatively charged colloidal solution is formed. () reezing point of colloidal solution is lower than true solution at same concentration of a solute. (3) Colloidal particles can pass through ordinary filter paper. (4) When excess of electrolyte is added to colloidal solution, colloidal particle will be precipitated. Ans. () reezing point of colloidal solution is higher than true solution at same concentration of a solute. 6. Which of the following is the correct structure of Adenosine? () Ans. () Ribose () Ribose (3) Ribose (4) Ribose 7. The correct combination is : () [icl 4 ] square-planar ; [i(c) 4 ] paramagnetic () [i(c) 4 ] tetrahedral ; [i(c) 4 ] paramagnetic (3) [icl 4 ] paramagnetic ; [i(c) 4 ] tetrahedral (4) [icl 4 ] diamagnetic ; [i(c) 4 ] square-planar Ans. (3) [icl 4 ] [i(c) 4 ] sp 3 sp 3 C Paramagnetic ( unpaired electron) C i C C i + [Ar]3d 8, 4s 0, 4p 0 i() [Ar]3d 8, 4s, 4p 0 C is S..L. Cl (W..L.) (o pairing) [Ar] 3d 4s, 4p sp 3 (Tetrahedral) Page o.5

6 8. The IUPAC name of the following compound is : () 3-ethyl-4-methylhex-4-ene () 4,4-diethyl-3-methylbut--ene (3) 4-methyl-3-ethylhex-4-ene (4) 4-ethyl-3-methylhex--ene 9. An ideal gas undergoes a cyclic process as shown in igure. A B P C V U BC = 5 kj mol, q AB = kj mol W AB = 5 kj mol, W CA = 3 kj mol eat absorbed by the system during process CA is : () 5 kj mol () + 5 kj mol (3) 8 kj mol (4) 8 kj mol Ans. () P V AB isobaric BC Isochoric CA not defined U AB = q + W = 5 = 3 U ABC = U AB + U BC = 3 5 = 8 kj U CBA = +8 = Q + W 8 = Q + 3 Q = +5 kj Page o.6

7 0. Ejection of the photoelectron from metal in the photoelectric effect experiment can by stopped by applying 0.5 V when the radiation of 50 nm is used. The work function of the metal is : () 4 ev () 5.5 ev (3) 4.5 ev (4) 5 ev Ans. (3) = 50 nm = 500 Å E = hc = = 4.96 ev KE = stopping potential = 0.5 ev E = W 0 + K.E = W W 0 = ev. In graphite and diamond, the percentage of p-characters of the hybrid orbitals in hybridization are respectively : () 33 and 5 () 67 and 75 (3) 50 and 75 (4) 33 and 75 Ans. () Graphite sp hybridisation Diamond sp 3 hybridisation % P = 3 00 = 67 % % P = = 75 %. When an electric current is passed through acidified water, ml of hydrogen gas at.t.p was collected at the cathode in 965 seconds. The current passed, in ampere, is : ().0 () 0. (3) 0.5 (4).0 Cathode e + + (v.f.) = mole = i t v.f = i = i i = amp Page o.7

8 3. The minimum volume of water required to dissolve 0. g lead(ii) chloride to get a saturated solution (K sp of PbCl = ; atomic mass of Pb = 07 u) is : ().798 L () 0.36 L (3) 7.95 L (4) 0.8 L (K) sp PbCl = PbCl Pb + + Cl s s K sp = [Pb + ][Cl ] K sp = 4s 3 = s 3 = s = 0 3 M w M.w. V = 03 L V = 03 L V L = = 0.8 L 4. In which of the following reactions, an increase in the volume of the container will favour the formation of products? () 4 3 (g) + 5 (g) 4 (g) + 6 ( ) () (g) (g) + (g) (3) 3 (g) 3 (g) (4) (g) + I (g) I (g) Ans. () Volume P reaction proceed in which direction where number of gases mole increases. (g) (g) + (g) n g = ( + ) = Page o.8

9 5. The decreasing order of bond angles in B 3, 3, P 3 and I 3 is : () I 3 > B 3 > 3 > P 3 () B 3 > I 3 > P 3 > 3 (3) B 3 > 3 > P 3 > I 3 (4) I 3 > 3 > P 3 > B 3 Ans. () B sp Bond angle = 0º Bond angle = 07º sp 3 ( lone pair) I 3 P sp 3 When central atom size Bond angle 3 > P 3 I I Bond angle 80º I sp 3 d Bond Angle P 3 < 3 < B 3 < I 3 6. Which of the following arrangements shows the schematic alignment of magnetic moments of antiferromagnetic substance? () () (3) (4) Substances which are expected to possess para-magnetism or ferro-magnetism on the basis of unpaired electrons but actually they possess zero net magnetic moment are called anti ferromagnetic substance. 7. The reagent(s) required for the following conversion are : Et C C C C C () (i) ab 4 (ii) Raney i/ (iii) 3 + () (i) LiAl 4 (ii) 3 + (3) (i) B 6 (ii) DIBAL- (iii) 3 + (4) (i) B 6 (ii) SnCl /Cl (iii) 3 + Page o.9

10 8. The main reduction product of the following compound with ab 4 in methanol is : Me () Me () Me (3) Me (4) Me Ans. () 9. Xenon hexafluoride on partial hydrolysis produces compounds 'X' and 'Y'. Compounds 'X' and 'Y' and Ans. (3) the oxidation state of Xe are respectively : () Xe 4 (+6) and Xe 3 (+6) () Xe (+4) and Xe 3 (+6) (3) Xe 4 (+6) and Xe (+6) (4) Xe (+6) and Xe (+4) Xe 6 + Partial hydrolysis Partial hydrolysis +6 Xe 4 +6 Xe 30. A white sodium salt dissolves readily in water to give a solution which is neutral to litmus. When silver nitrate solution is added to the aforementioned solution, a white precipitate is obtained which does not dissolve in dilute nitric acid. The anion is : () C 3 () S 4 (3) S (4) Cl Cl + a + Ag3 acl (SASB salt) AgCl (white ppt) (not dissolve in dilute 3 ) (eutral) Page o.0

dissolved in water and precipitated as AgCl. The mass of AgCl (in g) obtained will be : (Given : Molar mass

1.A sample of NaClO3 is converted by heat to NaCl with a loss of 0.16 g of oxygen. The residue is dissolved in water and precipitated as AgCl. The mass of AgCl (in g) obtained will be : (Given : Molar