Practice Questions

Q32.The type of hybridization and no. of lone pair(s) of electron of Xe in XeOF4 , respectively, are: (1) sp3d2 and 1 (2) sp3d2 and 2 (3) sp3d and 2 (4) sp3d and 1

Q32.Among the following, the energy of 2s orbital is lowest in: JEE Main 2019 (12 Apr Shift 2) JEE Main Previous Year Paper (1) K (2) H (3) Na (4) Li

Q32.The electrons are more likely to be found: (1) Only in the region a (2) In the region a and b (3) In the region a and c (4) Only in the region c

Q33.The isoelectronic set of ions is: (1) F−, Li+, Na+ and Mg2+ (2) N3−, Li+, Mg2+ and O2− (3) N3−, O2−, F− and Na+ (4) Li+, Na+, O2− and F−

Q33.The correct order of the atomic radii of C, Cs, Al, and S is: (1) C < S < A1 < Cs (2) S < C < Cs < Al (3) S < C < Al < Cs (4) C < S < Cs < Al

Q33.Aluminium is usually found in +3 oxidation state. In contrast, thallium exists in +1 and +3 oxidation states. This is due to: (1) Diagonal relationship (2) Lattice effect (3) Lanthanoid contraction (4) Inert pair effect

Q33.The correct option with respect to the Pauling electronegativity values of the elements is: (1) Te > Se (2) Ga < Ge (3) Si < Al (4) P > S

Q33.The process with negative entropy change is: (1) Synthesis of ammonia from N2 and H2 . (2) Dissolution of iodine in water. (3) Dissociation of CaSO4 (s) to CaO (s) and (4) Sublimation of dry ice. SO3 (g).

Q33.The group number, number of valence electrons, and valency of an element with atomic number 15, respectively, are: (1) 15,6 and 2 (2) 16,6 and 3 (3) 16,5 and 2 (4) 15,5 and 3

Q34.A process has ΔH = 200 J mol−1 and ΔS = 40 JK −1mol−1. Out of the values given below choose the minimum temperature above which the process will be spontaneous: (1) 20 K (2) 5K (3) 12K (4) 4K

Q34.The IUPAC symbol for the element with atomic number 119 would be: (1) Unh (2) Uun (3) Une (4) Uue

Q34.The incorrect match in the following is: (1) ΔG0 < 0, K > 1 (2) ΔG0 > 0, K < 1 (3) ΔG0 = 0, K = 1 (4) ΔG0 < 0, K < 1

Q35.During compression of a spring the work done is 10 kJ and 2 kJ escaped to the surroundings as heat. The change in internal energy, ΔU(in kJ) is: (1) −8 (2) 8 (3) 12 (4) −12

Q36.Among the following, the set of parameters that represents path functions, is: i) q + w ii) q iii) w iv) H −TS (1) (ii) and (iii) (2) (i), (ii), and (iii) (3) (ii), (iii) and (iv) (4) (i) and (iv)

Q37.The amphoteric hydroxide is: (1) Be(OH)2 (2) Ca(OH)2 (3) Mg(OH)2 (4) Sr(OH)

Q37.Magnesium powder burns in air to give (1) MgO and Mg3N2 . (2) MgO only. (3) Mg(NO3)2 and Mg3N2 . (4) MgO and Mg(NO3)2 . JEE Main 2019 (09 Apr Shift 1) JEE Main Previous Year Paper

Q38.The total number of isotopes of hydrogen and number of radioactive isotopes among them, respectively, are (1) 2 and 1 (2) 2 and 0 (3) 3 and 1 (4) 3 and 2

Q38.What is the IUPAC name of the following compound? (1) 4−Bromo −3−methylpent −2−ene (2) 3−Bromo −3−methyl −1, 2−dimethylprop −1− ene (3) 2−Bromo −3−methyl pent −3−ene (4) 3−Bromo −1, 2−dimethylbut −1−ene

Q38.The correct statements among I to III regrading group 13 element oxides are, (I) Boron trioxide is acidic. (II) Oxides of aluminum and gallium are amphoteric. (III) Oxides of indium and thallium are basic. (1) (I) and (III) only (2) (I) and (II) only (3) (I), (II) and (III) (4) (II) and (III) only

Q38. C60, an allotrope of carbon contains (1) 12 hexagons and 20 pentagons. (2) 16 hexagons and 16 pentagons. (3) 18 hexagons and 14 pentagons. (4) 20 hexagons and 12 pentagons.

Q39.NaH is an example of: (1) Electron −richhydride (2) Metallichydride (3) Salinehydride (4) Molecularhydride

Q39.The relative stability of +1 oxidation state of group 13 elements follows the order (1) Al < Ga < Tl < In (2) T1 < In < Ga < Al (3) Ga < Al < ln < Tl (4) Al < Ga < In < Tl

Q39.The metal used for making X-ray tube window is: (1) Mg (2) Na (3) Be (4) Ca

Q39.The amorphous form of silica is: (1) quartz (2) kieselguhr (3) tridymite (4) cristobalite

Q39.Given: Co3 + + e- →Co2 + ; E° = + 1.81V Pb3 + + 2e- →Pb2 + ; E° = + 1.67V Ce4 + + e- →Ce3 + ; E° = + 1.61V Bi3 + + 3e- →Bi; E° = + 0.20V Oxidizing power of the species will increase in the order: (1) Co3 + < Ce4 + < Bi3 + < Pb4 + (2) Bi3 + < Ce4 + < Pb4 + < Co3 + (3) Co3 + < Pb4 + < Ce3 + < Bi4 + (4) Ce4 + < Pb4 + < Bi3 + < Co3 +