Ramakrishna Mission Residential College (Autonomous) Affiliated to the University of Calcutta arendrapur, Kolkata 700103, West Bengal, India UG Admission Test, 2017 Subject : Chemistry Full Marks : 50 Duration : 1 hour 30 minutes Group A (30 =) 1. S I unit of radioactivity is as ûua l SI HLL qm a) becquerel (Bq) b) curie (Ci) c) Disintegration (i e) per minute ( j ev fë a) d) gray (Gy) 2. In the equation for depression of freezing point, T=Kf m; m is expressed in qj ˆl Ahej el pj LlZ qm T=Kf m z HM e m-hl HLL qm a) molarity ( j m l V) b) mole fraction ( j mià wn) c) molality ( j m m V) d) formality (gjñ m V) 3. The solid catalyst used for dehydration of alcohol to olefin is AÉ m L qm L el ca L l J m ge Evfæ Ll a héhq a L We Ae OVL V qm a) Quick lime ( f s Q e) b) silica gel ( p ml Sm) c) Alumina (AÉ m je ) d) Magnesia (jé e pu ) 4. itronium ion is generated from concentrated nitric acid by treatment with t e C VÊL AÉ px b L e C VÊ eu j Bue Evfæ Ll a héhq a hl ll V qm-- a) Perchloric acid (HClO4) b) Hydrochloric acid (HCl) c) Acetic acid (CH3COOH) d) Hydrofluoric acid (HF) 5. Unit of Planck s constant is fôé ˆ dë h Ll HLL qm a) erg.cm b) joule sec 1 c) erg.sec. d) erg.sec 1 6. The ion that does not give precipitate with Ag +, is e Ql L e Bue V Ag + Bu el p h œ²u u L e Adx rf Evfæ L l e? a) Br b) F c) I d) C 7. A radioactive decay follows as ûu h LlZ L e œ² jl fë œ²u? a) First order kinetics (fëbjœ²j) b) Second order kinetics ( àa u œ²j) c) Zero order kinetics (n e露j) d) Third order kinetics (a«a u œ²j) 8. 8 g of a radioelement decays to 0 25 g in 40 minutes. Its half-life is HL V as ûu j± ml 8g f lj Z b L 0.25 g q a 40 j ev pju m z j±m Vl AdÑ u L m qm a) 16 minutes b) 10 minutes c) 8 minutes d) 4 minutes
9. Aqueous H3PO4 is titrated with aqueous aoh using phenolphthalein indictor. The salt obtained at the equivalence point is gembé me e cñnl héhq l L l Sm u âh Z H3PO4 L aoh âhz à l fën ja Ll m fënjzr Z Evfæ mhz V qm-- a) a3po4 b) a2hpo4 c) ah2po4 d) apo3 10. The latent heat of fusion of ice at 0 C is 80 Cal g 1. The molar entropy change of fusion of ice at the same temperature is 0 C Eo a u hlg m el m e a f qm 80 LÉ m l fë aë j (Cal g 1 ) z HLC Eo a u hlg m e j m l HeVÊ fl f lhañe La q h? a) 0 29 cal mol 1 K 1 b) 2 63 cal mol 1 K 1 c) 5 27 cal mol 1 K 1 d) 7 54 cal mol 1 K 1 11. The following are the standard redox potential at 1 acidity : e Q 1 AÉ px j œ l âh Z L ul V fëj Z hs lz dë hl cju qm z / =100 ; / =054 ; =+136 =+290 +107. On gradual addition of ao2 to a mixture KX, KY, KZ, and KP at 1 acidity, the product formed at first is KX, KY, KZ Hhw KP j nëa 1 AÉ px j œ h nø HL V âh Z œ²j a ao2 âhz k L l m fëb j L e fc bñ V Evfæ q h? = a) Z2 b) Y2 c) X2 d) P2 12. The ernst equation for electrode potential of electrode is = electrode of R and F are a svà l hi hl SeÉ e eñøv pj LlZ V qm = HLL c V kb œ² j a) cal K 1 mol 1 & faraday b) J K 1 mol 1 & coulomb c) L atm K 1 mol 1 & coulomb d) ev K 1 mol 1 & faraday 13. The correct balanced equation for the reaction of H2O2 with acidified KMnO4 is H2O2--Hl p AÇm L«a KMnO4 âh Zl h œ²u l p WL n ja pj LlZ V qm a) 2KMnO4+7H2O2+3H2SO4 = K2SO4+2MnSO4+6O2+10H2O b) 2KMnO4+3H2O2+3H2SO4 = K2SO4+2MnSO4+4O2+6H2O c) 2KMnO4+ H2O2+3H2SO4 = K2SO4+2MnSO4+3O2+4H2O d) 2KMnO4+5H2O2+3H2SO4 = K2SO4+2MnSO4+5O2+8H2O. The unit HM e R Hhw F Hl p WL
14. Which will give silver mirror test with Tollens reagent? e Ql L e k± V V m¾p hl l Ll p pmi l jll AbÑ v VØV VE hl u l f l BÙ¹lZ Evfæ Ll h? a) C6H5CHO b) CH3CHO c) HCOOH d) All of these (B l ae V k±c) 15. Acetone can be converted to pinacol by e Ql L e V AÉ p V e L fe L m f lza L l? a) Mg/Hg/H2O b) Zn/Hg/HCl c) a/hg/h2so4 d) All of these (B l phl VC) 16. The IUPAC name of OH is OH k± Vl IUPAC e j qm CH3 CH3 a) 5-Methylhexanol b) 2-Methylhexanol c) 2-Methylhex-3-enol d) 4-Methyl-2-pentenol 17. Select the correct order of boiling points of the following compounds. e Ql k± ml Øg Ve ˆl p WL œ²j L e V? (CH2OH)2 (CH2OMe)2 CH2OH CH2OMe A B C a) A > C > B b) A < B < C c) B > C > A d) C > A > B 18. Which of the following does not show geometrical isomerism? e Ql L e k± V SÉ j al pjh uha fëcnñe L l e? a) 1,2-Dichloro-1-pentene b) 1,3-Dichloro-2-pentene c) 1,1-Dichloro-1-pentene d) 1,4-Dichloro-2-pentene 19. Which has the least heat of hydrogenation? e Ql L e k± Vl pçf ZÑ q C XÊ Se pwk š²ll Z e eéaj a f Evfæ q h? a) b) c) d) 20. Which of the following will give same product with HBr in presence or absence of peroxide? e Ql L e k± V H2O2 -Hl Ef ÙÛ a Hhw Ae f ÙÛ a Eiu r œc HBr-Hl p h œ²u u HLC fc bñ Evfæ Ll h? i) Cyclohexene ii) 1 Methyl cyclohexene iii) 1,2 Dimethyl cyclohexene iv) 1 Butene a) i and ii b) i and iii c) i and iv d) ii and iii 21. Alkene (A) O O3/H2O CH3 C CH3 + CH3COOH + CH3 C COOH O A can be A-Hl pñ hé We qm CHCH3 C(CH3)2 CH3 a) CH3 C CH=C b) CH3 C CH=CH CH3
CH3 c) Both correct (a Hhw b c VC pñh) d) one is correct (a Hhw b L e VC eu) 22. Which of the following is expected to have highest boiling point? e Ql L e k± Vl Øg Ve ˆ phñ dl q h? a) PH3 b) H3 c) AsH3 d) CH4 23. Which of the following has sp 3 hybridised central atom? e Ql L e k± Vl L¾cÊ u flj Z V sp 3 pˆl ua? a) H3 b) BF3 c) d) XeF4 24. Which of the following metal chlorides is insoluble in water both in hot and cold? e Ql L e d ah LÓ l CX V lj Hhw W Eiu AhÙÛ ac S m Aâ hé? a) LiCl b) CuCl2 c) PbCl2 d) AgCl 25. Which one of the following main group atom / ion would you expect to be good ligand? e Ql flj Z /Bue m fkñ u p lz l fëd e nëz m a AhÙÛ e L l z H cl L e V i m mé ä q h?...... +.. ++ a) :X:.. b) :Y:.. c) :Z:.. d) :P:.. 26. Which one of the following is paramagnetic? e Ql L e V fl Q ðl u? a) b) c) O2 d) 27. One mole of H3PO2 is treated with 3 moles of aoh. The resulting substance is 1 j m H3PO2 Hhw 3 j m aoh -Hl h œ²u u Evfæ fc bñ qm a) 1 mole a3po2 b) 1 mole ah2po2+2 mole aoh c) 1 mole a2hpo2+1 mole aoh d) 1 mole H3PO2+3 mole aoh 28. Select the correct assignments of the following dipole moment values. e Q ae V dë h u ï j Ll j e cju B R z e Ql Q l V hl Òfl j dé L e V a fë a V k± l pw nôø håe ÙÛa j e p af ZÑ? Dipole moments (dë h u ï jl) : 4 97 10 30 Cm ; 0 60 10 30 Cm ; 0 00 10 30 Cm a) AsH3(0 00 10 30 Cm), BF3(0 60 10 30 Cm), H3(4 97 10 30 Cm) b) AsH3(0 60 10 30 Cm), BF3(4 97 10 30 Cm), H3(0 00 10 30 Cm) c) AsH3(0 60 10 30 Cm), BF3(0 00 10 30 Cm), H3(4 97 10 30 Cm) d) AsH3(4 97 10 30 Cm), BF3 (0 60 10 30 Cm), H3(0 00 10 30 Cm) 29. umber of unpaired electrons present in the ground-state electronic configuration of the element with atomic number 16 is 16 f lj Z hl œ²j ˆ h nø j±m Vl phñ dl p ÙÛa AhÙÛ u hk È C mlvêe pwmé qm a) 0 b) 2 c) 4 d) 3
30. A mixture containing 50 ml of 1 HCl and 50 ml of 4 HCl was diluted with water to 500 ml. The normality of the resulting solution would be 50 ml 1 HCl Hhw 50 ml 4 HCl-Hl HL V jnë Zl Buae Sm j n u 500 ml Ll qm z Evfæ âhz Vl ejñ m j œ q h a) 1 b) 0.1 c) 0.5 d) 2 Group B 31. Write down the reagents for the following one-step conversion: 1X4 e Ql f lhañe m HLd f pwo Va Ll l SeÉ fë u Se u hl ll m mm x (a) OH Br OH (b) SO 3 H (c) O 2 Cl (d) H H 32. Write down the balanced ionic equations for the following reactions: 1 4 e Ql h œ²u ml fë a Vl n ja Bue u pj LlZ mm a) Reduction of K3[Fe(C)6] by H2O2 in alkaline medium r l u j dé j K3[Fe(C)6]- L H2O2 c u hs lz b) Oxidation of aqueous suspension of iodine by chlorine Sm u j dé j B u X el LÓ le à l S lz
c) Oxidation of acetaldehyde to acetic acid by acid dichromate AÇmL«a X C œ² jv à l AÉ pv m Xq C Xl AÉ p VL AÉ p X S lz d) Reduction of nitrite to ammonia by Zn and caustic alkali Zn Hhw L ØVL r l à l e CVÊ CV mh Zl AÉ j eu u S lz 33. A mixture of ahco3 and a2co3, on treatment with 100 ml 0.1 H2SO4, produces 112 ml of CO2 at STP. The resulting solution is then titrated with 0.05 aoh using methyl orange indicator and 50 ml of aoh is required for neutralization. Find out the weight of ahco3 and a2co3 present in the mixture. 4 ahco3 Hhw a2co3 HL V jnëz 100 ml 0.1 H2SO4 -Hl p h œ²u u STP- a 112 ml CO2 Evfæ L l z HC fë œ²u u Evfæ âhz V L jb Cm A l e cñn Ll Ef ÙÛ a a pçf ZÑ l f fën ja Ll a 50 ml 0.05 aoh âhz fë u Se qu z jnëz V a Ef ÙÛa ahco3 Hhw a2co3-hl f lj Z ezñu L l z 34. Identify (A), (B), (C) and (D) from the following observations on chemical reactions and explain the reactions involved: Identification: 4 x ½ ; Equation: ½ + ½ + 1 e Q E õ Ma l p u el h œ²u m pçf LÑa fkñ hrz ml i š a (A), (B), (C) Hhw (D) L pe š² L l Hhw pw nôø h œ²u m hé MÉ L l z i) Colourless aqueous solution of (A) dissolves CaCO3 with effervescence of a colourless gas (B). A-l hzñq e Sm u âhz CaCO3 L âh iä L l Hhw HL V hzñq e É p h ch c BL l Evfæ qu z ii) Solution of (A), on treatment with aqueous AgO3, gives a yellowish white precipitate (C) insoluble in ammonium hydroxide. A-l âhz AgO3-Hl Sm u âh Zl p h œ²u u AÉ j eu j q C XÊ C X Aâ hé qm c i-p c HL V Ad rf (C) Evfæ L l z iii) Solution of (A), on reaction with aqueous CuSO4, gives a dark brown product (D) that is violet in vapour state. A-l Sm u âhz CuSO4 Hl Sm u âh Zl p h œ²u u HL V t h c j h ZÑl fc bñ (D) Evfæ L l z h f u D-Hl hzñ h Z z 35. Q is a gaseous oxide of xenon. When 0.100 g of Q is placed in 50.0 ml steel vessel at 0 o C, the pressure is 0.229 atm. Q Se el HL V É p u A CX z 0.100g Q 0C Eo a u HL V 50 ml Bua el CØf al f œ l M m f œl ia ll Q f qu 0.229 AÉ V j pú gu l z a) What is the molar mass of Q and what is a likely formula? 2 Q-Hl j m l il Hhw pñ hé BZ hl pw La L? b) When the vessel and its contents are warmed to 100 o C, Q decomposes into its constituent elements. What is the total pressure and what are the partial pressures of xenon and oxygen in the container? (atomic mass of xenon is 131.3) 2 HC AhÙÛ u f œ V 100C Eo a u Ešç Ll m Q e Sl Ef c e j±m m a h u Sa qu z H r œ f œl ia ll j V Q f Hhw See J A S el fë a V AwnQ f L q h? ( Se el f lj e hl il 131.3 ) z Space for Work in Rough "l g'-h L S Ll SeÉ