Practice Questions

Q50.Oxidation state of sulphur in anions SO2−3 , S2O2−4 and S2O2−6 increases in the orders : (1) S2O2−6 < S2O2−4 < SO2−3 (2) SO2−6 < S2O2−4 < S2O2−6 (3) S2O2−4 < SO2−3 < S2O2−6 (4) S2O2−4 < S2O2−6 < SO2−3

Q50.The rate of a reaction doubles when its temperature changes from 300K to 310K. Activation energy of such a reaction will be: ​ (R = 8.314 JK−1 mol−1 and log 2= 0.301) JEE Main 2013 (07 Apr) JEE Main Previous Year Paper (1) 58. 5 kJ mol −1 (2) 60. 5 kJ mol −1 (3) 53. 6 kJ mol −1 (4) 48. 6 kJ mol −1

Q51.In which of the following octahedral complex species the magnitude of Δ0 will be maximum? (1) [Co(H2O)6]2+ (2) [Co(CN)6]3− (3) [Co(C2O4)3]3− (4) [Co(NH3)6]3+

Q51. XeO4 molecule is tetrahedral having: (1) Two pπ −dπ bonds (2) One pπ −dπ bonds (3) Four pπ −dπ bonds (4) Three pπ −dπ bonds

Q51.Trigonal bipyramidal geometry is shown by: (1) XeOF2 (2) XeO3F2 (3) FXeOSO2F (4) [XeF8]2−

Q52.Potassium dichromate when heated with concentrated sulphuric acid and a soluble chloride, gives brown-red vapours of : (1) CrO3 (2) CrCl3 (3) CrO2Cl2 (4) Cr2O3

Q52.In nucleophilic substitution reaction, order of halogens as incoming (attacking) nucleophile is: I−> Br−> Cl− The order of halogens as departing nucleophile should be : (1) Br−> I−> Cl− (2) I−> Br−> Cl− (3) Cl−> Br−> I− (4) Cl−> I−> Br−

Q52.Which of the following is wrong statement? (1) Ozone is violet-black in solid state (2) Ozone is diamagnetic gas (3) ONCl and ONO- are isoelectronic (4) O3 molecule is bent

Q52.Identify the incorrect statement: (1) In (Si3O9)6− , tetrahedral SiO4 units share two (2) Trialkylchlorosilane on hydrolysis gives R3SiOH oxygen atoms. . (3) SiCl4 undergoes hydrolysis to give H4SiO4 . (4) (Si3O9)6− has cyclic structure.

Q53.Which of the following statements is incorrect? (1) Fe2+ ion also gives blood red colour with SCN− (2) Fe3+ ion also gives blood red colour with SCN− ion. ion. (3) On passing H2 S into Na2ZnO2 solution a white (4) Cupric ion reacts with excess of ammonia ppt of ZnS is formed. solution to give deep blue colour of [Cu(NH3)4]2+ ion.

Q53. The major product in the following reaction (1) (2) (3) (4)

Q53.The element with which of the following outer electron configuration may exhibit the largest number of oxidation states in its compounds : (1) 3d54s2 (2) 3d84s2 (3) 3d74s2 (4) 3d64s2

Q54.The reaction of phenol with benzoyl chloride to give phenyl benzoate is known as : (1) Claisen reaction (2) Schotten-Baumann reaction (3) Reimer-Tiemann reaction (4) Gatterman-Koch reaction

Q54.Given Eo = −0. 74 V; Eo = 1. 51 V Cr3+/Cr MnO−4 /Mn2+ Eo = 1.33 V; Eo Cl2 Cl−= 1. 36 V Cr2O2−7 /Cr3+ Based on the data given above, strongest oxidising agent will be: (1) Mn2+ (2) MnO−4 (3) Cl− (4) Cr3+

Q55.Which of the following is the product of aldol condensation? (1) (2) (3) (4)

Q55. X is: JEE Main 2013 (09 Apr Online) JEE Main Previous Year Paper (1) (2) (3) (4)

Q55.Which of the following complex species is not expected to exhibit optical isomerism? (1) [Co(NH3)3Cl3] (2) [Co(en)(NH3)2Cl2]+ (3) [Co(en)3]3+ (4) [Co(en)2Cl2]+

Q56.Amongst the following alcohols which would react fastest with conc. HCl and ZnCl2 ? (1) pentanol (2) 2-methyl butanol (3) 2-pentanol (4) 2-methyl butan-2-ol JEE Main 2013 (22 Apr Online) JEE Main Previous Year Paper

Q56.The order of basicity of amines in gaseous state is : (1) 1∘> 2∘> 3∘> NH3 (2) 3∘> 2∘> NH3 > 1∘ (3) 3∘> 2∘> 1∘> NH3 (4) NH3 > 1∘> 2∘> 3∘

Q56.Which of the following reagent(s) used for the conversion? (1) glycol/ LiAlH4/H3O+ (2) glycol/ NaH/H3O+ (3) LiAlH4 (4) NaBH4

Q56.An unknown alcohol is treated with the "Lucas reagent" to determine whether the alcohol is primary, secondary or tertiary. Which alcohol reacts fastest and by what mechanism: (1) Secondary alcohol by SN2 (2) Tertiary alcohol by SN2 (3) Secondary alcohol by SN1 (4) Tertiary alcohol by SN1

Q57.In Williamson synthesis of mixed ether having a primary and a tertiary alkyl group if tertiary halide is used, then : (1) Rate of reaction will be slow due to slow (2) Alkene will be the main product. cleavage of carbon-halogen bond. (3) Simple ether will form instead of mixed ether. (4) Expected mixed ether will be formed.

Q58.Formaldehyde can be distinguished from acetaldehyde by the use of : (1) Schiff's reagent (2) Tollen's reagent (3) I2 /Alkali (4) Fehling's solution

Q58.An organic compound A upon reacting with NH3 gives B. On heating, B gives C. C in presence of KOH reacts with Br2 to give CH3CH2NH2. A is : (1) (2) CH3CH2COOH (3) CH3COOH (4) CH3CH2CH2COOH

Q58.Which of the following statement is not correct? (1) Amylopectin is a branched polymer of α - (2) Cellulose is a linear polymer of β-glucose. glucose. (3) Glycogen is the food reserve of plants. (4) All proteins are polymers of α - amino acids.