Practice Questions

Q34.Which one of the following alkaline earth metal ions has the highest ionic mobility in its aqueous solution? (1) Sr2 + (2) Mg2 + (3) Ca2 + (4) Be2 +

Q34.Which one of the following is an example of disproportionation reaction? (1) 3 MnO2−4 + 4H+ →2 MnO−4 + MnO2 + 2H2O (2) MnO−4 + 4H+ + 4e−→MnO2 + 2H2O (3) 10I−+ 2 MnO−4 + 16H+ →2 Mn2 + +8H2O + (4)5I28 MnO−4 + 3 S2O2−3 + H2O →8 MnO2 + 6 SO2−4 + 2 OH

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.Given below are two statements: One is labelled as Assertion A and the other is labelled as Reason R Assertion A : The reduction of a metal oxide is easier if the metal formed is in liquid state than solid state. Reason R : The value of ΔGΘ becomes more on negative side as entropy is higher in liquid state than solid state. In the light of the above statements. Choose the most appropriate 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

Q34.The correct order of bond orders of C2−2 , N2−2 and O2−2 is (1) C2−2 > N2−2 > O2−2 (2) O2−2 > N2−2 > O2−2 (3) N2−2 > O2−2 > C2−2 (4) C2−2 > O2−2 > N2−2

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

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.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. 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 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.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.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.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.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.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.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

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

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.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.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

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