Practice Questions

Q30.For one mole of an ideal gas, which of these statements must be true? (a) Internal energy (U) and enthalpy (H) each depends on temperature. (b) Compressibility factor Z is not equal to 1 (c) CP, m –CV, m = R (d) dU = Cv dT for any process (1) (a) and (c) (2) (b), (c) and (d) (3) (c) and (d) (4) (a), (c) and (d)

Q30.For the following Assertion and Reason, the correct option is Assertion (A) : When Cu (II) and sulphide ions are mixed, they react together extremely quickly to give a solid. Reason (R) : The equilibrium constant of Cu2+(aq) + S2−(aq) ⇌Cus(s) is high because the solubility product is low. (1) (A) is false and (R) is true. (2) Both (A) and (R) are false. (3) Both (A) and (R) are true but (R) is not the (4) Both (A) and (R) are true and (R) is the explanation for (A). explanation for (A).

Q30.The stoichiometry and solubility product of a salt with the solubility curve given below is, respectively: (1) X2Y, 2 × 10−9M3 (2) XY2, 4 × 10−9M3 (3) XY2, 1 × 10−9M3 (4) XY, 2 × 10−6M3 JEE Main 2020 (08 Jan Shift 1) JEE Main Previous Year Paper

Q31.An open beaker of water in equilibrium with water vapour is in a sealed container. When a few grams of glucose are added to the beaker of water, the rate at which water molecules : (1) leaves the vapour increases (2) leaves the solution increases (3) leaves the solution decreases (4) leaves the vapour decreases

Q31.Among the reactions (a) −(d), the reaction(s) that does/do not occur in the blast furnace during the extraction of iron is/are: (a) CaO + SiO2 →CaSiO3 (b) 3Fe2O3 + CO →2Fe3O4 + CO2 (c) FeO + SiO2 →FeSiO3 (d) FeO →Fe + 21 O2 (1) a (2) a and d (3) c and d (4) d

Q31.Two elements A and B have similar chemical properties. They don't form solid hydrogencarbonates, but react with nitrogen to form nitrides. A and B, respectively, are : (1) Na and Rb (2) Na and Ca (3) Cs and Ba (4) Li and Mg

Q31.Match the following : Test/Method Reagent (i) Lucas Test (a) C6H5 SO2 Cl / aq. KOH (ii) Dumas method (b) HNO3 / AgNO3 (iii) Kjeldahl's method (c) CuO / CO3 (iv) Hinsberg Test (d) Conc. HCl and ZnCl2 (e) H2 SO4 (1) (i)-(d), (ii)-(c), (iii)-(b), (iv)-(e) (2) (i)-(b), (ii)-(d), (iii)-(e), (iv)-(a) (3) (i)-(d), (ii)-(c), (iii)-(e), (iv)-(a) (4) (i)-(b), (ii)-(a), (iii)-(c), (iv)-(d)

Q31.The increasing order of the acidity of the α-hydrogen of the following compounds is: (A) (B) (C) (D) (1) (D) < (C) < (A) < (B) (2) (B) < (C) < (A) < (D) (3) (A) < (C) < (D) < (B) (4) (C) < (A) < (B) < (D)

Q31.Which of the following compounds shows geometrical isomerism? (1) 2-methylpent-2-ene (2) 4-methylpent-2-ene (3) 4-methylpent-1-ene (4) 2-methylpent-1-ene

Q31.The Ksp for the following dissociation is 1.6 × 10−5 PbCl2(s) ⇌Pb2+(aq) + 2Cl−(aq) Which of the following choices is correct for a mixture of 300 mL 0.134 M Pb(NO3)2 and 100 mL 0.4 M NaCl? (1) Not enough data provided (2) Q < Ksp (3) Q > Ksp (4) Q = Ksp JEE Main 2020 (09 Jan Shift 1) JEE Main Previous Year Paper

Q31.Among statements (a) −(d), the correct ones are: (a) Decomposition of hydrogen peroxide gives di-oxygen. (b) Like hydrogen peroxide, compounds, such as KClO3, Pb(NO3) and NaNO3 When heated liberate di- oxygen. (c) 2 -Ethylanthraquinone is useful for the industrial preparation of hydrogen peroxide. (d) Hydrogen peroxide is used for the manufacture of sodium perborate. (1) (a), (b), (c) and (d) (2) (a), (b), and (c) only (3) (a), (c), and (d) only (4) (a) and (c) only

Q31.The strength of an aqueous NaOH solution is most accurately determined by titrating: (Note: consider that an appropriate indicator is used) (1) Aq. NaOH in a pipette and aqueous oxalic acid (2) Aq. NaOH in a burette and aqueous oxalic acid in a burette in a conical flask (3) Aq. NaOH in a burette and concentrate H2SO4 (4) Aq. NaOH in a volumetric flask and in a conical flask concentrated H2SO4 in a conical flask

Q31.Glycerol is separated in soap industries by : (1) Fractional distillation (2) Differential distillation (3) Steam distillation (4) Distillation under reduced pressure

Q32. Arrange the following labelled hydrogens in decreasing order of acidity: (1) b > a > c > d (2) c > b > a > d (3) b > c > d > a (4) c > b > d > a

Q32.On heating, lead (ll) nitrate gives a brown gas (A). The gas (A) on cooling changes to a colourless solid/liquid (B). (B) on heating with NO changes to ablue solid (C). The oxidation number of nitrogen in solid (C) is: (1) +5 (2) +2 (3) +3 (4) +4

Q32.The IUPAC name of following compound is : (1) 2-nitro- 4-hydroxymethyl- 5-amino benzaldehyde (2) 3-amino- 4-hydroxymethyl- 5-nitrogenzaldehyde (3) 5-amino- 4-hydroxymethyl- 2-nitrobenzaldehyde (4) 4-amino- 2-formyl- 5-hydroxymethyl nitrogenzene

Q32.Among the statement (I – IV), the correct ones are: (I) Be has smaller atomic radius compared to Mg. (II) Be has higher ionization enthalpy than AI. (III) Charge/radius ratio of Be is greater than that of Al. (IV) Both Be and Al form mainly covalent compounds (1) (I), (II) and (IV) (2) (I), (III) and (IV) (3) (II), (III) and (IV) (4) (I), (II) and (III) JEE Main 2020 (03 Sep Shift 2) JEE Main Previous Year Paper

Q32.The Kjeldahl method of Nitrogen estimation fails for which of the following reaction products? (1) (c) and (d) (2) (a) and (d) (3) (a), (c) and (d) (4) (b) and (c) JEE Main 2020 (03 Sep Shift 1) JEE Main Previous Year Paper

Q32.In the following reaction sequence the major products A and B are : JEE Main 2020 (05 Sep Shift 1) JEE Main Previous Year Paper (1) (2) (3) (4)

Q32.An alkaline earth metal ' M' readily forms water soluble sulphate and water insoluble hydroxide. Its oxide MO is very stable to heat and does not have rock-salt structure. M is (1) Sr (2) Ca (3) Mg (4) Be

Q32.Consider the following reactions: 'A' is JEE Main 2020 (06 Sep Shift 1) JEE Main Previous Year Paper (1) (2) (3) (4)

Q32.The correct order of stability for the following alkoxides is: (1) (B) > (A) > (C) (2) (C) > (B) > (A) (3) (C) > (A) > (B) (4) (B) > (C) > (A)

Q32.Among the statements (a) −(d), the correct ones are: (a) Lithium has the highest hydration enthalpy among the alkali metals. (b) Lithium chloride is insoluble in pyridine. (c) Lithium cannot form ethynide upon its reaction with ethyne. (d) Both lithium and magnesium react slowly with H2O . (1) (a), (b) and (d) only (2) (a), (c) and (d) only (3) (b) and (c) only (4) (a) and (d) only

Q32.In comparison to the zeolite process for the removal of permanent hardness, the synthetic resin method is (1) less efficient as it exchanges only anions. (2) more efficient as it can exchange both cations as well as anions. (3) less efficient as the resins cannot be regenerated. (4) more efficient as it can exchange only cations.

Q33.Among the following compounds, geometrical isomerism is exhibited by : (1) (2) (3) (4)