Practice Questions

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)

Q34.Number of lone pairs of electrons in the central atom of SCl2, O3, ClF3 and SF6 , respectively, are (1) 0, 1, 2 & 2 (2) 2, 1, 2 & 0 (3) 1, 2, 2 & 0 (4) None of these

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.Consider the species CH4, NH+4 and BH−4 . Choose the correct option with respect to the there species: (1) They are isoelectronic and only two have (2) They are isoelectronic and all have tetrahedral tetrahedral structures structures (3) Only two are isoelectronic and all have (4) Only two are isoelectronic and only two have tetrahedral structures tetrahedral structures

Q34.Addition of H2 SO4 to BaO2 produces (1) BaO, SO2 and H2O (2) BaHSO4 and O2 (3) BaSO4, H2 and O2 (4) BaSO4 and H2O2

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.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.The correct order of melting point is (1) Sr > Ca > Mg > Be (2) Be > Mg > Ca > Sr (3) Be > Ca > Sr > Mg (4) Be > Ca > Mg > Sr

Q35.Which amongst the following is not a pesticide? JEE Main 2022 (28 Jun Shift 1) JEE Main Previous Year Paper (1) DDT (2) Dieldrin (3) Organophosphate (4) Sodium Arsenite

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.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.The reaction of H2O2 with potassium permanganate in acidic medium leads to the formation of mainly (1) Mn2 + (2) Mn4 + (3) Mn3 + (4) Mn6 +

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.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.Assertion: The amphoteric behaviour of water is explained by Lewis acid base theory Reason: water acts as acid with NH3 and base with H2S (1) Both Assertion and Reason are true and Reason is (2) Both Assertion and Reason are true but Reason is the correct explanation of Assertion. NOT the correct explanation of Assertion. (3) Assertion is true but Reason is false. (4) Assertion is false but Reason is true.

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

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.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.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.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.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)

Q36.Given below are two statements: Statement I : Hydrogen peroxide can act as an oxidizing agent in both acidic and basic conditions. Statement II: Density of hydrogen peroxide at 298 K is lower than that of D2O. In the light of the above statements. Choose the correct answer from the options. (1) Both statement I and Statement II are ture (2) Both statement I and Statement II are false (3) Statement I is true but Statement II is false (4) Statement I is false but Statement II is true