SOLUTIONS TO NEET ( ) - Code GG - Chemistry

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SOLUTIONS TO NEET 018 - (6-5-018) - Code GG - Chemistry 16.

00 l of water vapours at 1 atm and 7 K () 10 mol of water () 0.18 g water () 18 ml of water 17.

diagram below: Then the species undergoing disproportionation is (1) Br () HBrO () BrO () BrO 18.

1 SOLUTIONS TO NEET ( ) - Code GG - Chemistry 16. In which case is the number of molecules of water maximum? (1) 0.00 l of water vapours at 1 atm and 7 K () 10 mol of water () 0.18 g water () 18 ml of water 17. Consider the change in oxidation state of Bromine corresponding to different emf values as shown in the diagram below: Then the species undergoing disproportionation is (1) Br () HBrO () BrO () BrO 18. Among CaH, BeH, BaH, the order of ionic character is (1) BeH BaH CaH () BaH BaH CaH () CaH BeH BaH () BeH CaH BaH CENTERS: UBAI / DELHI / AKOLA / LUCKNOW / NAGPUR / NASHIK / PUNE / GOA / BOKARO / DUBAI # 1

19. The correct difference between first and second order reactions is that (1) a first-order reaction can be catalyzed; a second-order reaction

on reactant concentrations A ; the half-life of a second-order () the half-life of a first-order reaction does not depend on 0 reaction does depend

isomerism 11. Which one of the following ions exhibits d-d transition and paramagnetism as well?

2 19. The correct difference between first and second order reactions is that (1) a first-order reaction can be catalyzed; a second-order reaction cannot be catalyzed () the rate of a first-order reaction does depend on reactant concentrations; the rate of a secondorder reaction does not depend on reactant concentrations A ; the half-life of a second-order () the half-life of a first-order reaction does not depend on 0 reaction does depend on A 0 () the rate of a first-order reaction does not depend on reactant concentrations; the rate of a secondorder reaction does depend on reactant concentrations 10. The type of isomerism shown by the complex CoCl en is (1) Ionization isomerism () Linkage isomerism () Coordination isomerism () Geometrical isomerism 11. Which one of the following ions exhibits d-d transition and paramagnetism as well? (1) no () no () CrO () CrO are (1) square planar geometry and paramagnetic () tetrahedral geometry and paramagnetic () tetrahedral geometry and diamagnetic () square planar geometry and diamagnetic 1. The geometry and magnetic behavior of the complex Ni CO CENTERS: UBAI / DELHI / AKOLA / LUCKNOW / NAGPUR / NASHIK / PUNE / GOA / BOKARO / DUBAI #

1. Iron carbonyl, Fe CO 5 is (1) trinuclear () dinuclear () mononuclear ()

atch the metal ions given in Column I with the spin magnetic moments of the ions

c. d. Cr ii. 5 B.. Fe iii. B.. Ni iv. B.. v. 15 B.

Which one of the following elements is unable to form F 6 ion?

In the structure of CIF, the number of lone pairs of electrons on central atom Cl is

3 1. Iron carbonyl, Fe CO 5 is (1) trinuclear () dinuclear () mononuclear () tetranuclear 1. atch the metal ions given in Column I with the spin magnetic moments of the ions given in Column II and assign the correct code: Column I Column II a. Co i. 8 B.. b. c. d. Cr ii. 5 B.. Fe iii. B.. Ni iv. B.. v. 15 B.. a b c d (1) iv i ii iii () iii v i ii () i ii iii iv () iv v ii i 15. Which one of the following elements is unable to form F 6 ion? (1) B () In () Al () Ga 16. In the structure of CIF, the number of lone pairs of electrons on central atom Cl is (1) four () three () two () one 17. The correct order of N-compounds in its decreasing order of oxidation states is (1) HNO, NHCl, NO, N () NHCl, N, NO, HNO () HNO, NO, NHCl, N () HNO, NO, N, NHCl CENTERS: UBAI / DELHI / AKOLA / LUCKNOW / NAGPUR / NASHIK / PUNE / GOA / BOKARO / DUBAI #

18. Which of the following statements is not true for halogens?

() Chlorine has the highest electron-gain enthalpy () All are oxidizing agents () All form

Considering Ellingham diagram, which of the following metals can be used to reduce alumina?

The correct order of atomic radii in group 1 elements is (1) B < Ga < Al < Tl < In () B < Ga <

4 18. Which of the following statements is not true for halogens? (1) All but fluorine show positive oxidation states. () Chlorine has the highest electron-gain enthalpy () All are oxidizing agents () All form monobasic oxyacids 19. Considering Ellingham diagram, which of the following metals can be used to reduce alumina? (1) g () Cu () Zn () Fe 150. The correct order of atomic radii in group 1 elements is (1) B < Ga < Al < Tl < In () B < Ga < Al < In < Tl () B < Al < Ga < In < Tl () B < Al < In < Ga < Tl 151. In the section The electrophile involved is (1) dichloromethyl anion C HCl () formyl cation C HO () dichlorocarbene : CCl () dichloromethyl cation CHCl CENTERS: UBAI / DELHI / AKOLA / LUCKNOW / NAGPUR / NASHIK / PUNE / GOA / BOKARO / DUBAI #

15. Carboxylic acids have higher boiling points than aldehydes, ketones and even alcohols of comparable molecular mass.

intermolecular H-bonding () formation of carboxylate ion () formation of intramolecular H-bonding 15.

characteristic smell. A and Y are respectively (1) () () () 15.

5 15. Carboxylic acids have higher boiling points than aldehydes, ketones and even alcohols of comparable molecular mass. It is due to their (1) more extensive association of carboxylic acid via van der Waals force of attraction () formation of intermolecular H-bonding () formation of carboxylate ion () formation of intramolecular H-bonding 15. Compound A, C8H10O, is found to react with NaOI (produced by reacting Y with NaOH) and yields a yellow precipitate with characteristic smell. A and Y are respectively (1) () () () 15. Which of the following molecules represents the order of hybridization sp,sp,sp,sp from left to right atoms? (1) CH CH CH CH () CH CH CH CH () CH CH C CH () HC C C CH CENTERS: UBAI / DELHI / AKOLA / LUCKNOW / NAGPUR / NASHIK / PUNE / GOA / BOKARO / DUBAI # 5

155. Which of the following carbocations is expected to be most statble? (1) () () () 156. Which of the following is correct with respect to I effect of the substituents?

(1) Examples are Bakelite and melamine () They contain strong covalent bonds in their polymer chains.

Nitration of aniline in strong acidic medium also gives m-nitroaniline because (1) In absence of substituents nitro group always goes to m-position.

6 155. Which of the following carbocations is expected to be most statble? (1) () () () 156. Which of the following is correct with respect to I effect of the substituents? (R=alkyl) (1) NH OR F () NR OR F () NR OR F () NH OR F 156. (,) 157. Regarding cross-linked or network polymers, which of the following statements is incorrect? (1) Examples are Bakelite and melamine () They contain strong covalent bonds in their polymer chains. () They are formed from bi- and tri-functional monomers () They contain covalent bonds between various linear polymer chains () They contain weak covalent bonds in their polymer chains Nitration of aniline in strong acidic medium also gives m-nitroaniline because (1) In absence of substituents nitro group always goes to m-position. () In acidic (strong) medium aniline is present as anilinium ion. () In electrophilic substitution reactions amino group is meta directive. () In spite of substituents nitro group always goes to only m-position The difference between amylase and amylopectin is (1) Amylopectin have 1 linkage and 1 6 linkage () Amylose is made up of glucose and galactose () Amylose have 1 linkage and 1 6 linkage () Amylopectin have 1 linkage and 1 6 linkage CENTERS: UBAI / DELHI / AKOLA / LUCKNOW / NAGPUR / NASHIK / PUNE / GOA / BOKARO / DUBAI # 6

160. A mixture of g formic acid and 5 g oxalic acid is treated with conc. HSO.

Weight (in g) of the remainng product at STP will be (1) 8 () () 0 () 1 161.

For the redox reaction no CO H n CO HO The correct coefficients of the reactants for the balanced

Which one of the following conditions will favour maximum formation of the product in the reaction, A

7 160. A mixture of g formic acid and 5 g oxalic acid is treated with conc. HSO. The evolved gaseous mixture is passed through KOH pellets. Weight (in g) of the remainng product at STP will be (1) 8 () () 0 () Which of the following oxides is most acidic in nature? (1) BaO () CaO () BeO () go 16. For the redox reaction no CO H n CO HO The correct coefficients of the reactants for the balanced equation are no C O H (1) 16 5 () 5 16 () 5 16 () Which one of the following conditions will favour maximum formation of the product in the reaction, A g B g X g H XkJ? r (1) High temperature and high pressure () High temperatures and low pressure () Low temperature and low pressure () Low temperature and high pressure CENTERS: UBAI / DELHI / AKOLA / LUCKNOW / NAGPUR / NASHIK / PUNE / GOA / BOKARO / DUBAI # 7

16. When initial concentration of the reactant is doubled, the half-life period of a zero order reaction (1) is tripled

The bond dissociation energies of X, Y and XY are in the ratio of 1:0.5:1. XY is -00 kj (1) 800 kj 1 mol.

The correction factor a to the ideal gas equation corresponds to (1) electric field present between the gas molecules ()

8 16. When initial concentration of the reactant is doubled, the half-life period of a zero order reaction (1) is tripled () remains unchanged () is doubled () is halved 165. The bond dissociation energies of X, Y and XY are in the ratio of 1:0.5:1. XY is -00 kj (1) 800 kj 1 mol. The bond dissociation energy of X will be 1 mol () 00 kj 1 mol () 100 kj 1 mol H for the formation of () 00 kj mol The correction factor a to the ideal gas equation corresponds to (1) electric field present between the gas molecules () forces of attraction between the gas molecules () volume of the gas molecules () density of the gas molecules CENTERS: UBAI / DELHI / AKOLA / LUCKNOW / NAGPUR / NASHIK / PUNE / GOA / BOKARO / DUBAI # 8

167. Following solutions were prepared by mixing different volumes of NaOH and HCl of different concentrations: a. 60mL HCl 0mL NaOH 10 10 b. 55mL HCl 5mL NaOH 10 10 c. 75mL HCl 5mL NaOH 5 5 d.

(1) Both magnitude and sign of the charge on the ion () The sign of charge on the ion alone () Size of the ion alone () The magnitude of the charge on the ion alone 168.

9 167. Following solutions were prepared by mixing different volumes of NaOH and HCl of different concentrations: a. 60mL HCl 0mL NaOH b. 55mL HCl 5mL NaOH c. 75mL HCl 5mL NaOH 5 5 d. 100mL HCl 100mL NaOH ph of which one of them will be equal to 1? (1) d () c () a () b 168. On which of the following properties does the coagulating power of an ion depend? (1) Both magnitude and sign of the charge on the ion () The sign of charge on the ion alone () Size of the ion alone () The magnitude of the charge on the ion alone 168. (1) According to Hardy-Schulz rule, the coagulating power of an ion depend on the magnitude and sign of the charge on the ion Given van der Waals constant for NH, H,O and CO are respectively 7, 0,1 6 and 59, which one of the following gases is most easily liquefied? (1) O () CO () H () NH CENTERS: UBAI / DELHI / AKOLA / LUCKNOW / NAGPUR / NASHIK / PUNE / GOA / BOKARO / DUBAI # 9

170. The solubility of BaSO in water is sp K will be (Given molar mass of (1) () 1 08 10 mol L BaSO

The value of its solubility product 108 10 mol L 8 108 10 mol L 10 171.

10 170. The solubility of BaSO in water is sp K will be (Given molar mass of (1) () mol L BaSO 10 gl 1 g mol ) 1 () mol L 1 () 1 at 98 K. The value of its solubility product mol L mol L Identify the major products P, Q and R in the following sequence of reactions: 171. () CENTERS: UBAI / DELHI / AKOLA / LUCKNOW / NAGPUR / NASHIK / PUNE / GOA / BOKARO / DUBAI # 10

Which oxide of nitrogen is not a common pollutant introduced into the atmosphere both due to natural and human acitivity? (1) NO () NO () NO () NO 5 175.

11 17. Which of the following compounds can form a zwitterions? (1) Benzoic acid () Glycine () Acetanilide () Aniline 17. The compound C7H 8 undergoes the following reactions: Cl Br C Fe Zn HCl 7H8 A B C The product C is (1) -bromo-,,6-trichlorotoluene () p-bromotoluene () o-bromotoluene () m-bromotoluene 17. Which oxide of nitrogen is not a common pollutant introduced into the atmosphere both due to natural and human acitivity? (1) NO () NO () NO () NO The compound A on treatment with Na gives B, and with PCl 5 gives C. B and C react together to give diethyl ether. A, B and C are in the order (1) CH5Cl,CH 6,CH5OH () CH5OH,CH5ONa,C H5Cl () CH5OH,CH5Cl,C H5ONa () CH5OH,CH 6,CH5Cl 176. Hydrocarbon (A) reacts with bromine by substitution to form an alkyl bromide which by Wurtz reaction is converted to gaseous hydrocarbon containing less than four carbon atoms. (A) is (1) CH CH () CH () CH CH () CH CH CENTERS: UBAI / DELHI / AKOLA / LUCKNOW / NAGPUR / NASHIK / PUNE / GOA / BOKARO / DUBAI # 11

177. Consider the following species: CN,CN, NO and CN Which one of these will have the highest bond

I the ground state electronic configuration of (X) is 1s s s, the simplest formula for this compound

Above 900 C, it transforms to fcc structure.

radii of iron remains constant with temperature) is (1) () 1 () () 180.

(1) The electronic configuration of N atom is () The value of m for z d is zero.

12 177. Consider the following species: CN,CN, NO and CN Which one of these will have the highest bond order? (1) CN () CN () CN () NO 178. agnesium reacts with an element (X) to form an ionic compound. I the ground state electronic configuration of (X) is 1s s s, the simplest formula for this compound is (1) gx () gx () gx () gx 179. Iron exhibits bcc structure at room temperature. Above 900 C, it transforms to fcc structure. The ratio of density of iron at room temperature to that at 900 C (assuming molar mass and atomic radii of iron remains constant with temperature) is (1) () 1 () () 180. Which one is a wrong statement? (1) The electronic configuration of N atom is () The value of m for z d is zero. () An orbital is designated by three quantum numbers while an electeron in an atom is designated by four quantum numbers. () Total orbital angular momentum of electron in s orbital is equal to zero. CENTERS: UBAI / DELHI / AKOLA / LUCKNOW / NAGPUR / NASHIK / PUNE / GOA / BOKARO / DUBAI # 1

NEET(UG) 2018 TEST PAPER WITH ANSWER (HELD ON SUNDAY 06 th MAY, 2018) CHEMISTRY

NEET(UG) 2018 TEST PAPER WITH ANSWER (HELD ON SUNDAY 06 th MAY, 2018) CHEMISTRY NEET(UG)-018 46. A mixture of. g formic acid and 4.5 g oxalic acid is treated with conc. SO 4. The evolved gaseous mixture is passed through K pellets. Weight (in g) of the remaining product at STP will