Practice Questions

Q37.The structures of beryllium chloride in the solid state and vapour phase, respectively, are: (1) chain and chain (2) dimeric and chain (3) chain and dimeric (4) dimeric and dimeric

Q38.An example of a disproportionation reaction is (1) 2KMnO4 →K2MnO4 + MnO2 + O2 (2) 2MnO4- + 10I- + 16 H+ →2 Mn2 + + 5I2 + 8H2O (3) 2 CuBr →CuBr2 + Cu (4) 2 NaBr + Cl2 →2NaCl + Br2

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.The hydride that is NOT electron deficient is: (1) SiH4 (2) B2H6 (3) GaH3 (4) AlH3

Q38.The strength of 11.2 volume solution of H2O2 is [Given that, the molar mass of H = 1 g mol-1 and O = 16 g mol-1] (1) 1.7 % (2) 13.6 % (3) 34 % (4) 3.4 %

Q38.The incorrect statement is: (1) LiNO3 decomposes on heating to give LiNO2 (2) LiCl crystallises from aqueous solution as and O2. LiCl −2H2O . (3) Lithium is the strongest reducing agent among (4) Lithium is least reactive with water among the the alkali metals. alkali metals.

Q38.The synonym for water gas when used in the production of methanol is: (1) syn gas (2) laughing gas (3) natural gas (4) fuel gas

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.

Q38.The isotopes of hydrogen are: (1) Protium, deuterium and tritium (2) Tritium and protium only (3) Protium and deuterium only (4) Deuterium and tritium only

Q38.The correct statements among (a) to (d) regarding H2 as a fuel are : (i) It produces less pollutants than petrol. (ii) A cylinder of compressed dihydrogen weighs ∼30 times more than a petrol tank producing the same amount of energy. (iii) Dihydrogen is stored in tanks of metal alloys like NaNi5 (iv) On combustion, values of energy released per gram of liquid dihydrogen and LPG are 50 and 142 kJ, respectively. (1) (ii)and(iv)only (2) (i)and(iii)only (3) (ii), (iii)and(iv)only (4) (i), (ii)and(iii)only

Q38.The combination of plots which does not represent isothermal expansion of an ideal gas is (A) (B) JEE Main 2019 (12 Jan Shift 2) JEE Main Previous Year Paper (C) (D) (1) (A) and (D) (2) (B) and (C) (3) (B) and (D) (4) (A) and (C)

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.The correct statements among a to d are: a Saline hydrides produce H2 gas when reacted with H2O . b Reaction of LiAlH4 with BF3 leads to B2H6 . c PH3 and CH4 are electron - rich and electron - precise hydrides, respectively. d HF and CH4 are called as molecular hydrides. (1) a, b and c only. (2) a, c and d only. (3) c and d only. (4) a, b, c and d JEE Main 2019 (10 Apr Shift 2) JEE Main Previous Year Paper

Q38.Which of the following compounds is not aromatic? (1) (2) (3) (4) JEE Main 2019 (09 Jan Shift 2) JEE Main Previous Year Paper

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 +

Q39.What will be the major product in the following mononitration reaction? (1) (2) (3) (4)

Q39.The correct order of hydration enthalpies of alkali metal ions is: (1) Na+ > Li+ > K+ > Rb+(2)>Na+Cs+> Li+ > K+ > Cs+(3)>Li+Rb+> Na+ > K+ > Rb+(4)>Li+Cs+> Na+ > K+ > Cs+ > Rb+

Q39.The covalent alkaline earth metal halide X = Cl, Br, I is: (1) CaX2 (2) MgX2 (3) SrX2 (4) BeX2

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

Q39.The C −C bond length is maximum in: (1) C70 (2) C60 (3) graphite (4) diamond

Q39.The alkaline earth metal nitrate that does not crystallise with molecules is: (1) 𝐵𝑎𝑁𝑂32 (2) 𝑆𝑟𝑁𝑂32 (3) 𝑀𝑔𝑁𝑂32 (4) 𝐶𝑎𝑁𝑂32

Q39.The alloy used in the construction of aircrafts is: (1) Mg −Al (2) Mg −Mn (3) Mg −Sn (4) Mg −Zn

Q39.The pH of rain water is approximately: (1) 5.6 (2) 6.5 (3) 7.5 (4) 7.0