Practice Questions

Q34.Which amongst the given plots is the correct plot for pressure (p) vs density (d) for an ideal gas? (1) (2) (3) (4)

Q34.Given below are two statements. Statement I : O2, Cu2+ and Fe3+ are weakly attracted by magnetic field and are magnetized in the same direction as magnetic field. Statement II : NaCl and H2O are weakly magnetized in opposite direction to magnetic field. In the light of the above statements, choose the most appropriate answer form the options given below (1) Both Statement I and Statement II are correct. (2) Both Statement I and Statement II are incorrect. (3) Statement I is correct but Statement II is (4) Statement I is incorrect but Statement II is incorrect. correct.

Q34.The Plot of pH -metric titration of weak base NH4 OH vs strong acid HCl looks like (1) (2) (3) (4)

Q34.The Ksp for bismuth sulphide Bi2S3 is 1 . 08 × 10-73. The solubility of Bi2S3 in molL-1 at 298 K is (1) 1 . 0 × 10-15 (2) 2 . 7 × 10-12 (3) 3 . 2 × 10-10 (4) 4 . 2 × 10-8

Q34.Which of the following can be used to prevent the decomposition of H2O2 ? (1) Urea (2) Formaldehyde (3) Formic acid (4) Ethanol

Q34.The formula of the purple colour formed in Laissaigne's test for sulphur using sodium nitroprusside is (1) Na4[Fe (CN)5(NOS)] (2) NaFe[Fe (CN)6] (3) Na[Cr (NH3)2(NCS)4] (4) Na2[Fe (CN)5(NO)]

Q34.Arrange the following in the decreasing order of their covalent character : JEE Main 2022 (29 Jun Shift 1) JEE Main Previous Year Paper (A) LiCl (B) NaCl (C) KCl (D) CsCl Choose the most appropriate answer from the options given below (1) (A) > (C) > (B) > (D) (2) (B) > (A) > (C) > (D) (3) (A) > (B) > (C) > (D) (4) (A) > (B) > (D) > (C)

Q35.Number of lone pair (s) of electrons on central atom and the shape of BrF3 molecule respectively, are : (1) 0 , triangular planar. (2) 1 , pyramidal. (3) 2 , bent T-shape. (4) 1, bent T-shape Q36. 4. 0 moles of argon and 5. 0 moles of PCl5 are introduced into an evacuated flask of 100 litre capacity at 610 K. The system is allowed to equilibrate. At equilibrium, the total pressure of mixture was found to be 6. 0 atm. The Kp for the reaction is [Given : R = 0. 082 L atm K−1 mol−1 ] JEE Main 2022 (29 Jun Shift 2) JEE Main Previous Year Paper (1) 2. 25 (2) 6. 24 (3) 12. 13 (4) 15. 24

Q35.Phenol on reaction with dilute nitric acid, gives two products. Which method will be most efficient for large scale separation? (1) Chromatographic separation (2) Steam distillation (3) Fractional Crystallisation (4) Sublimation

Q35.Given below are two statements: One is labelled as Assertion A and the other is labelled as Reason R Assertion A : Permanganate titration are not performed in presence of hydrochloric acid. Reason R : Chlorine is formed as a consequence of oxidation of hydrochloric acid. In the light of the above statements, choose the correct answer from the options given below (1) Both A and R are true and R is the correct (2) Both A and R are true but R is NOT the correct explanation of A explanation of A (3) A is true but R is false (4) A is false but R is true

Q35.The reaction of zinc with excess of aqueous alkali, evolves hydrogen gas and gives (1) Zn (OH)2 (2) ZnO (3) [Zn (OH)4]2− (4) [ZnO2]2−

Q35.Boiling of hard water is helpful in removing the temporary hardness by converting calcium hydrogen carbonate and magnesium hydrogen carbonate to (1) CaCO3 and Mg (OH)2 (2) CaCO3 and MgCO3 (3) Ca (OH)2 and MgCO3 (4) Ca (OH)2 and Mg (OH)2

Q35.Reaction of BeCl2 with LiAlH4 gives : (A) AlCl3 (B) BeH2 (C) LiH (D) LiCl (E) BeAlH4 Choose the correct answer from options given below (1) (A), (D) & (E) (2) (A), (B) & (D) (3) (D) & (E) (4) (B), (C) & (D)

Q35.An element A of group 1 shows similarity to an element B belonging to group 2 . If A has maximum hydration enthalpy in group 1 then B is (1) Mg (2) Be (3) Ca (4) Sr

Q35.For kinetic study of the reaction of iodide ion with H2O2 at room temperature : (A) Always use freshly prepared starch solution. (B) Always keep the concentration of sodium thiosulphate solution less than that of KI solution. (C) Record the time immediately after the appearance of blue colour. (D) Record the time immediately before the appearance of blue colour. (E) Always keep the concentration of sodium thiosulphate solution more than that of KI solution. Choose the correct answer from the options given below (1) A, B, C only (2) A, D, E only (3) D, E obly (4) A, B, E only

Q35.At 25 °C and 1 atm pressure, the enthalpies of combustion are as given below: Substance H2 C (graphite) C2H6(g) ΔcHΘ −286. 0 −394. 0 −1560. 0 kJmol−1 The enthalpy of formation of ethane is JEE Main 2022 (24 Jun Shift 2) JEE Main Previous Year Paper (1) +54. 0 kJ mol−1 (2) −68. 0 kJ mol−1 (3) −86. 0 kJ mol−1 (4) +97. 0 kJ mol−1

Q35.A student needs to prepare a buffer solution of propanoic acid and its sodium salt with pH 4. The ratio of [CH3 CH2 COO−] required to make buffer is Given : Ka(CH3 CH2 COOH) = 1. 3 × 10−5 [CH3 CH2 COOH] (1) 0. 03 (2) 0. 13 (3) 0. 23 (4) 0. 33

Q35.Which of the following statements are correct ? (A) Both LiCl and MgCl2 are soluble in ethanol. JEE Main 2022 (24 Jun Shift 1) JEE Main Previous Year Paper (B) The oxides Li2 O and MgO combine with excess of oxygen to give superoxide. (C) LiF is less soluble in water than other alkali metal fluorides. (D) Li2 O is more soluble in water than other alkali metal oxides. Choose the most appropriate answer from the options given below (1) (A) and (C) only (2) (A), (C) and (D) only (3) (B) and (C) only (4) (A) and (D) only

Q35.Given below are two statements. One is labelled as Assertion A and the other is labelled as Reason R. Assertion A : Activated charcoal adsorbs SO2 more efficiently than CH4 . Reason R : Gases with lower critical temperatures are readily adsorbed by activated charcoal. In the light of the above statements, choose the correct answer from the options given below. (1) Both A and R are correct and R is the correct (2) Both A and R are correct but R is NOT the explanation of A . correct explanation of A . (3) A is correct but R is not correct. (4) A is not correct but R is correct.

Q35. BeCl2 reacts with LiAlH4 to give (1) Be + Li[AlCl4] + H2 (2) Be + AlH3 + LiCl + HCl (3) BeH2 + LiCl + AlCl3 (4) BeH2 + Li[AlCl4]

Q35.A compound 'X' is a weak acid and it exhibits colour change at pH close to the equivalence point during neutralization of NaOH with CH3COOH. Compound 'X' exists in ionized form in basic medium. The compound 'X' is JEE Main 2022 (29 Jul Shift 2) JEE Main Previous Year Paper (1) methyl orange (2) methyl red (3) phenolphthalein (4) erichrome Black T

Q35.High purity (> 99. 95%) dihydrogen is obtained by (1) reaction of zinc with aqueous alkali. (2) electrolysis of warm aqueous barium hydroxide solution between nickel electrodes. (3) electrolysis of acidified water using platinum (4) reaction of zinc with dilute acid. electrodes.

Q35.Which of the following is most stable ? JEE Main 2022 (27 Jun Shift 2) JEE Main Previous Year Paper (1) (2) (3) (4)

Q35.The solubility of AgCl will be maximum in which of the following? (1) 0. 01 M HCl (2) 0. 01 M KCl (3) Deionised water (4) 0. 01M AgNO3

Q35.Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R. Assertion A :Phenolphthalein is a pH dependent indicator, remains colourless in acidic solution and gives pink colour in basic medium Reason R : Phenolphthalein is a weak acid. It doesn't dissociate in basic medium. In the light of the above statements, choose the most appropriate answer from the options given below (1) Both A and R are true and R is the correct (2) Both A and R are true but R is NOT the correct explanation of A explanation of A. (3) A is true but R is false (4) A is false but R is true