1. ÊŒ Ê ªÒ ÁSÕ U ŒÊ U ÃÊ Ëÿ Ê UáÊ. (1) ãõòà Ë ÃË Ò UãÃÈ ã UÊÚ Ë ÉÊ UÃË Ò. (2) ãõòà Ë ÁSÕ U U ÃË Ò UãÃÈ ã UÊÚ Ë ÃË Ò

Size: px

Start display at page:

Download "1. ÊŒ Ê ªÒ ÁSÕ U ŒÊ U ÃÊ Ëÿ Ê UáÊ. (1) ãõòà Ë ÃË Ò UãÃÈ ã UÊÚ Ë ÉÊ UÃË Ò. (2) ãõòà Ë ÁSÕ U U ÃË Ò UãÃÈ ã UÊÚ Ë ÃË Ò"

August Phillips
6 years ago
Views:

1 CHEMISTRY U ÊÿŸ ÊÊSòÊ 1. An ideal gas undergoes isothermal expansion at constant pressure. During the process : enthalpy increases but entropy decreases. enthalpy remains constant but entropy increases. enthalpy decreases but entropy increases. Both enthalpy and entropy remain constant ml of 0.2 M ammonia solution is treated with 25 ml of 0.2 M HCl. If pk b of ammonia solution is 4.75, the ph of the mixture will be : The electron in the hydrogen atom undergoes transition from higher orbitals to orbital of radius pm. This transition is associated with : Lyman series Balmer series Paschen series Brackett series 1. ÊŒ Ê ªÒ ÁSÕ U ŒÊ U ÃÊ Ëÿ Ê UáÊ UÃË Ò ß apple ãõòà Ë ÃË Ò UãÃÈ ã UÊÚ Ë ÉÊ UÃË Ò ãõòà Ë ÁSÕ U U ÃË Ò UãÃÈ ã UÊÚ Ë ÃË Ò ãõòà Ë ÉÊ UÃË Ò UãÃÈ ã UÊÚ Ë ÃUË Ò ãõòà Ë ÃÕÊ ã UÊÚ Ë ŒÊappleŸÊapple Ë ÁSÕ U U ÃË Ò M ÊappleÁŸÿÊ Áfl ÿÿ apple 50 ml Êapple 0.2 M HCl apple 25 ml apple ÊÕ Á Î Ã Á ÿê ÊÃÊ Ò ÿáœ ÊappleÁŸÿÊ Áfl ÿÿ apple pk b Ê ÊŸ 4.75 Êapple ÃÊapple Á üêáê Ê ph ÊappleªÊ Êß«UÊapple Ÿ U ÊáÊÈ apple ß appleä UÊÚŸ ìêã U ÊÚÁ U apple pm ÁòÊíÿÊ flê apple ÊÚÁ U Ã áê UÃÊ Ò ß áê Ê ê ãœ Á apple Ò fl Ò Êß ÒŸ üêappleáêë Ê U üêappleáêë Ê ÊŸ üêappleáêë apple apple U üêappleáêë 1 IX - CHEMISTRY

2 4. At 300 K, the density of a certain gaseous molecule at 2 bar is double to that of dinitrogen (N 2 ) at 4 bar. The molar mass of gaseous molecule is : 28 g mol 1 56 g mol g mol g mol 1 5. What quantity (in ml) of a 45% acid solution of a mono-protic strong acid must be mixed with a 20% solution of the same acid to produce 800 ml of a % acid solution? To find the standard potential of M 3+ /M electrode, the following cell is constituted : Pt/M/M 3+ (0.001 mol L 1 )/Ag + (0.01 mol L 1 )/Ag The emf of the cell is found to be volt at 298 K. The standard potential of half reaction M 3+ +3e M at 298 K will be : 0.38 Volt 0.32 Volt 1.28 Volt 0.66 Volt K U; 2 Ê U U Uπapple Á Ë ªÒ Ëÿ áêè Ê ÉÊãÊàfl, 4 Ê U U Uπapple «UÊßŸÊß UÊapple Ÿ (N 2 ) apple ÉÊŸàfl Ê ŒÍŸÊ Ò ªÒ Ëÿ áêè Ê Êapple U Œ ÿ ÊŸ Ò 28 g mol 1 56 g mol g mol g mol 1 5. ÊappleŸÊapple ÊappleÁ U ê apple 45% Á «U Áfl ÿÿ Ë Á ÃŸË ÊòÊÊ (ml apple ) Ë ê apple 20% Áfl ÿÿ apple ÊÕ Á ÊÿË ÊŸË øêá Á % Á «U Áfl ÿÿ Ê 800 ml Ÿ Êÿ? M 3+ /M ß ÒÄ UÊapple«U apple ÊŸ Áfl fl Êapple ÁŸ Ê Ÿapple apple Á ÁŸêŸ apple ŸÊÿÊ ªÿÊ Pt/M/M 3+ (0.001 mol L 1 )/Ag + (0.01 mol L 1 )/Ag apple Ê ß..». 298 K,U V ÊÿÊ ªÿÊ 298 K U, M 3+ +3e M, h Á Á ÿê Ê ÊŸ Áfl fl ÊappleªÊ 0.38 V 0.32 V 1.28 V 0.66 V ) 2 IX - CHEMISTRY

3 7. A gas undergoes change from state A to state B. In this process, the heat absorbed and work done by the gas is 5 J and 8 J, respectively. Now gas is brought back to A by another process during which 3 J of heat is evolved. In this reverse process of B to A : 10 J of the work will be done by the gas. 6 J of the work will be done by the gas. 10 J of the work will be done by the surrounding on gas. 6 J of the work will be done by the surrounding on gas. 8. Adsorption of a gas on a surface follows Freundlich adsorption isotherm. Plot of log m x versus log p gives a straight line with slope equal to 0.5, then : ( m x is the mass of the gas adsorbed per gram of adsorbent) Adsorption is independent of pressure. Adsorption is proportional to the pressure. Adsorption is proportional to the square root of pressure. Adsorption is proportional to the square of pressure. 7. ªÒ flsõê A apple flsõê B Êapple ÊÃË Ò ß apple, ªÒ mê UÊ ÊÊappleÁ Ã c Ê ÃÕÊ Á ÿê ªÿÊ Êÿ Ê 5 J ÃÕÊ 8 J Ò ªÒ Êapple ŒÍ appleu mê UÊ ÈŸ A flsõê apple ÊÃapple Ò ß apple 3 J c Ê ÁŸ ÃË Ò B apple A apple ß À appleu apple ªÒ mê UÊ 10 J Êÿ Á ÿê ÊÿappleªÊ ªÒ mê UÊ 6 J Êÿ Á ÿê ÊÿappleªÊ ªÒ U Á Uflapple Ê mê UÊ Á ÿê ªÿÊ Êÿ 10 J ÊappleªÊ ªÒ U Á Uflapple Ê mê UÊ Á ÿê ªÿÊ Êÿ 6 J ÊappleªÊ 8. Á Ë Îc U U ªÒ Ê Áœ ÊÊapple áê,» ÊÚÿã«UÁ Áœ ÊÊapple áê ÃÊ Ê ŸÈ UáÊ UÃÊ Ò log p apple ÁflL h log m x Ê å Ê U U appleuπê ŒappleÃÊ Ò Á Ê S Êapple 0.5 apple UÊ U ÊÿÊ ªÿÊ, Ã ( m x, ÁÃ ª Ê Áœ ÊÊapple mê UÊ Áœ ÊÊappleÁ Ã ªÒ Ê Œ ÿ ÊŸ Ò) Áœ ÊÊapple áê, ŒÊ U ÊÁüÊÃ Ÿ Ë Ò Áœ ÊÊapple áê, ŒÊ apple ÊŸÈ ÊÃË Ò Áœ ÊÊapple áê, ŒÊ apple flª Í apple ÊŸÈ ÊÃË Ò Áœ ÊÊapple áê, ŒÊ apple flª apple ÊŸÈ ÊÃË Ò 3 IX - CHEMISTRY

4 9. The rate of a reaction quadruples when the temperature changes from 300 to 310 K. The activation energy of this reaction is : (Assume activation energy and preexponential factor are independent of temperature; ln 2=0.693; R=8.314 J mol 1 K 1 ) kj mol kj mol kj mol kj mol A solution is prepared by mixing 8.5 g of CH 2 Cl 2 and g of CHCl 3. If vapour pressure of CH 2 Cl 2 and CHCl 3 at 298 K are 415 and 200 mmhg respectively, the mole fraction of CHCl 3 in vapour form is : (Molar mass of Cl=35.5 g mol 1 ) The electronic configuration with the highest ionization enthalpy is : [Ne] 3s 2 3p 1 [Ne] 3s 2 3p 2 [Ne] 3s 2 3p 3 [Ar] 3d 10 4s 2 4p 3 9. ÃÊ 300 apple 310 K Á UflÁÃ Ã ÊappleŸapple apple Á Á ÿê Ë Œ U øê U ªÈŸÊ Êapple ÊÃË Ò ß Á Á ÿê Ë Á ÿáê Ê Ò : (ÿ ÊŸ U øá ÿapple Á Á ÿáê Ê ÃÕÊ Ë Ä ÊappleappleŸappleÁã Êÿ»Ò Ä U U ÃÊ U ÁŸ U Ÿ Ë Ò; ln 2=0.693; R=8.314 J mol 1 K 1 ) kj mol kj mol kj mol kj mol g CH 2 Cl 2 ÃÕÊ g CHCl 3 Êapple Á Ê U Áfl ÿÿ ÃÒÿÊ U Á ÿê ÊÃÊ Ò ÿáœ 298 K U CH 2 Cl 2 ÃÕÊ CHCl 3 apple flêc ŒÊ Ê 415 ÃÕÊ 200 mmhg Êapple ÃÊapple flêc M apple ÁSÕÃ CHCl 3 Ê Êapple Ê Ò (Cl Ê Êapple U Œ ÿ ÊŸ=35.5 g mol 1 ) ëøã ÊÿŸŸ ãõòà Ë flê Ê ß appleä UÊÁŸ ÁflãÿÊ Ò [Ne] 3s 2 3p 1 [Ne] 3s 2 3p 2 [Ne] 3s 2 3p 3 [Ar] 3d 10 4s 2 4p 3 4 IX - CHEMISTRY

5 12. The following reaction occurs in the Blast Furnace where iron ore is reduced to iron metal : Fe 2 O 3 (s)+3 CO(g) 2 Fe(l)+3 CO 2 (g) Using the Le Chatelier s principle, predict which one of the following will not disturb the equilibrium? Removal of CO Removal of CO 2 Addition of CO 2 Addition of Fe 2 O Which one of the following is an oxide? KO 2 BaO 2 SiO 2 CsO flêàÿê ^Ë (é ÊS U» UŸapple Ê) apple ÁŸêŸ Á Á ÿê ÊappleÃË Ò Á apple Êÿ UŸ ÿs øáÿã Êapple U Êÿ UŸ œêãè ŸÃÊ Ò; Fe 2 O 3 (s)+3 CO(g) 2 Fe(l)+3 CO 2 (g) apple- ÊÊÃÒÁ Á hêãã Ê ÿêappleª U apple ÊªÈÁÄÃ ËÁ Á ÁŸêŸ apple apple ÊÒŸ Ê Êêÿ Êapple ÊÁflÃ Ÿ Ë appleuªê? CO Êapple ÁŸ Ê U UÊ ŒappleŸÊ CO 2 Êapple ÁŸ Ê U UÊ ŒappleŸÊ CO 2 Êapple Á Ê ŒappleŸÊ Fe 2 O 3 Êapple Á Ê ŒappleŸÊ 13. ÁŸêŸ apple apple ÊÒŸ Ê, ÊÚÄ Êß«U Ò? KO 2 BaO 2 SiO Which of the following is a set of green house gases? CH 4, O 3, N 2, SO 2 O 3, N 2, CO 2, NO 2 O 3, NO 2, SO 2, Cl 2 CO 2, CH 4, N 2 O, O 3 CsO ÁŸêŸ apple apple ÊÒŸ Ê ª ËŸ Ê ªÒ Êapple Ê ÈìÊÿ Ò? CH 4, O 3, N 2, SO 2 O 3, N 2, CO 2, NO 2 O 3, NO 2, SO 2, Cl 2 CO 2, CH 4, N 2 O, O 3 5 IX - CHEMISTRY

6 15. The group having triangular planar structures is : BF 3, NF 3, 2 CO3 2 CO 3, NO 3, NH 3,, 2 CO 3 NCl 3, BCl 3, 15. fl ª È Á apple ÁòÊ ÊappleáÊ Ã Ëÿ UøŸÊflÊ apple Ò, Ò BF 3, NF 3, 2 CO3 2 CO 3, NO 3, NH 3,, 2 CO 3 NCl 3, BCl 3, 16. XeF 6 on partial hydrolysis with water produces a compound X. The same compound X is formed when XeF 6 reacts with silica. The compound X is : XeF 2 XeF 4 XeOF 4 XeO The number of P OH bonds and the oxidation state of phosphorus atom in pyrophosphoric acid (H 4 P 2 ) respectively are : four and four five and four five and five four and five 16. XeF 6, apple ÊÕ Ê Á Ê - ÉÊ UŸ UŸapple U, ÿêòáª X ŒappleÃÊ Ò ÿ Ë ÿêòáª X Ã ŸÃÊ Ò XeF 6 Á Á Ê apple ÊÕ Á Á ÿê UÃÊ Ò ÿêòáª X Ò XeF 2 XeF 4 XeOF 4 XeO Êÿ UÊapple» ÊS» ÊappleÁ U Á «U (H 4 P 2 ) apple P OH Ê ãœêapple Ë ÅÿÊ ÃÕÊ» ÊS» Êapple U U ÊáÊÈ Ë ÊÚÄ Ë UáÊ flsõê Ê Ò øê U ÃÕÊ øê U Ê ø ÃÕÊ øê U Ê ø ÃÕÊ Ê ø øê U ÃÕÊ Ê ø 6 IX - CHEMISTRY

7 18. Which of the following ions does not liberate hydrogen gas on reaction with dilute acids? Ti 2+ V 2+ Cr 2+ Mn The correct sequence of decreasing number of π-bonds in the structures of H 2, H 2 and H 2 is : 18. ÁŸêŸ ÊÿŸÊapple apple apple ÊÒŸ Ê ÃŸÈ ê Êapple apple Á Á ÿê UŸapple U Êß«UÊapple Ÿ ªÒ Ÿ Ë ÁŸ Ê ÃÊ? Ti 2+ V 2+ Cr 2+ Mn H 2, H 2 ÃÕÊ H 2 Ë UøŸÊ apple π- Ê ãœêapple Ë ÉÊ UÃË ÅÿÊ Ê Ë Ò H 2 H 2 H 2 H 2 H 2 H 2 H 2 H [Co 2 (CO) 8 ] displays : one Co Co bond, six terminal CO and two bridging CO one Co Co bond, four terminal CO and four bridging CO no Co Co bond, six terminal CO and two bridging CO no Co Co bond, four terminal CO and four bridging CO 20. [Co 2 (CO) 8 ] Á ÿäã UÃÊ Ò Co Co Ê ãœ, U U UÁ Ÿ CO ÃÕÊ ŒÊapple appleãè œÿ CO Co Co Ê ãœ, øê U U UÁ Ÿ CO ÃÕÊ øê U appleãè œÿ CO Co Co Ê ãœ Ÿ Ë, U U UÁ Ÿ CO ÃÕÊ ŒÊapple appleãè œÿ CO Co Co Ê ãœ Ÿ Ë, øê U U UÁ Ÿ CO ÃÕÊ øê U appleãè œÿ CO 7 IX - CHEMISTRY

8 21. A compound of molecular formula C 8 H 8 O 2 reacts with acetophenone to form a single cross-aldol product in the presence of base. The same compound on reaction with conc. NaOH forms benzyl alcohol as one of the products. The structure of the compound is : 21. ÿêòáª Á Ê áêè ÍòÊ C 8 H 8 O 2 Ò, Á UÊapple»apple ŸÊappleŸ apple ˇÊÊ U Ë ÁSÕÁÃ apple Á Á ÿê U apple Ë Ê - À«UÊapple à ÊŒ ŸÊÃÊ Ò fl Ë ÿêòáª ÊãŒ NaOH apple ÊÕ Á Á ÿê U apple apple Á À Êapple ÊÚ, Êapple ŸŸappleflÊ apple à ÊŒÊapple apple apple Ò, ŸÊÃÊ Ò ÿêòáª Ë UøŸÊ Ò 8 IX - CHEMISTRY

9 22. Which of the following compounds is most reactive to an aqueous solution of sodium carbonate? 22. ÁŸêŸ apple apple ÊÒŸ Ê ÿêòáª, ÊappleÁ«Uÿ Ê Êapple Ÿapple U apple Ëÿ Áfl ÿÿ apple ÁÃ, flê Áœ Á Á ÿê ÊË Ò? 23. In the following structure, the double bonds are marked as I, II, III and IV 23. ÁŸêŸ UøŸÊ apple, Ám Ê ãœêapple Êapple I, II, III ÃÕÊ IV apple ÁøÁqÃ Á ÿê ªÿÊ Ò Geometrical isomerism is not possible at site (s) : III I I and III III and IV íÿêá ÃËÿ ÊflÿflÃÊ ß SÕÊŸ/ßŸ SÕÊŸÊapple apple fl Ÿ Ë Ò III I I ÃÕÊ III III ÃÕÊ IV 9 IX - CHEMISTRY

10 24. The major product of the following reaction is : 24. ÁŸêŸ Á Á ÿê Ê ÈÅÿ à ÊŒ Ò 10 IX - CHEMISTRY

11 25. The incorrect statement among the following is : α-d-glucose and β-d-glucose are anomers. α-d-glucose and β-d-glucose are enantiomers. Cellulose is a straight chain polysaccharide made up of only β-d-glucose units. The penta acetate of glucose does not react with hydroxyl amine. 26. Which of the following is a biodegradable polymer? 25. ÁŸêŸ apple apple ª Ã ÕŸ Ò α-d-ç Í Êapple ÃÕÊ β-d-ç Í Êapple appleÿêapple U Ò α-d-ç Í Êapple ÃÕÊ β-d-ç Í Êapple ÁÃÁ ê M Ò apple Í Êapple È oî π Ê Ê Ë Ò UÊß«U Ò Êapple apple fl β-d-ç Í Êapple Êapple apple ŸÊ Ò Ç Í Êapple Ê appleã UÊ Ë appleu U, Êß«UÊÁÄ apple ËŸ apple ÊÕ Á Á ÿê Ÿ Ë UÃÊ Ò 26. ÁŸêŸ apple apple ÊÒŸ Ê ÒflÁŸêŸŸËÿ È Ò? 11 IX - CHEMISTRY

12 27. The increasing order of the boiling points for the following compounds is : C2H5OH (I) C2H5OCH3 (IV) C2H5Cl (II) (III) < (IV) < (II) < (I) (IV) < (III) < (I) < (II) (II) < (III) < (IV) < (I) (III) < (II) < (I) < (IV) C2H5CH3 (III) 28. Which of the following compounds will show highest dipole moment? 27. ÁŸêŸ ÿêòáª Êapple apple ÄflÕŸÊ Êapple Ê ÃÊ È Ê Ò C2H5OH (I) C2H5OCH3 (IV) C2H5Cl (II) (III) < (IV) < (II) < (I) (IV) < (III) < (I) < (II) (II) < (III) < (IV) < (I) (III) < (II) < (I) < (IV) C2H5CH3 (III) 28. ÁŸêŸ ÿêòáª Êapple apple apple Á Ê Ámœ Èfl ÊÉÊÍáÊ flê Áœ ÊappleªÊ? (I) (II) (I) (II) (III) (IV) (III) (IV) (I) (I) (II) (II) (III) (III) (IV) (IV) 12 IX - CHEMISTRY

13 29. In the following reaction sequence : 29. ÁŸêŸ Á Á ÿê apple The compound I is : ÿêòáª I Ò 30. Among the following compounds, the increasing order of their basic strength is : (I) (II) 30. ÁŸêŸ ÿêòáª Ê apple apple ˇÊÊ UËÿ Ê âÿ Ê ÃÊ È Ê Ò (I) (II) (III) (IV) (I) < (II) < (IV) < (III) (I) < (II) < (III) < (IV) (II) < (I) < (IV) < (III) (II) < (I) < (III) < (IV) (III) (IV) (I) < (II) < (IV) < (III) (I) < (II) < (III) < (IV) (II) < (I) < (IV) < (III) (II) < (I) < (III) < (IV) 13 IX - CHEMISTRY

ÊÒÁÃ ÁflôÊÊŸ. ÿáœ a, b, c ÊÒ U d apple Ê Ÿ apple Ê appleˇê òêèá U Ê. (English+Hindi) PHYSICS. 1. A physical quantity P is described by the relation

ÊÒÁÃ ÁflôÊÊŸ. ÿáœ a, b, c ÊÒ U d apple Ê Ÿ apple Ê appleˇê òêèá U Ê. (English+Hindi) PHYSICS. 1. A physical quantity P is described by the relation PHYSICS ÊÒÁÃ ÁflôÊÊŸ 1. A physical quantity P is described by the relation 1 4 P = a b c d If the relative errors in the measurement of a, b, c and d respectively, are %, 1%, % and 5%, then the relative