Practice Questions

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.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.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.

Q36.Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R Assertion A : Boron is unable to form BF3−6 Reason R: Size of B is very small. 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

Q36.The number of bridged oxygen atoms present in compound B formed from the following reactions is 673 K PbNO32 ⟶ A + PbO + O2 Dimerise A ⟶ B (1) 0 (2) 1 (3) 2 (4) 3

Q36.Match List - I with List - II. List-I List-II ( Si-Compounds) ( Si-Polymeric/Other Products) A (CH3)4 Si I Chain Silicone B (CH3) Si (OH)3 II Dimeric Silicone C (CH3)2 Si (OH)2 III Silane JEE Main 2022 (27 Jun Shift 1) JEE Main Previous Year Paper D (CH3)3 Si(OH) IV 2 D- Silicone Choose the correct answer from the options given below (1) (A) −(III), (B) −(II), (C) −(I), (D) −(IV) (2) (A) −(IV), (B) −(I), (C) −(II), (D) −(III) (3) (A) −(II), (B) −(I), (C) −(IV), (D) −(III) (4) (A) −(III), (B) −(IV), (C) −(I), (D) −(II)

Q36.What will be the major product of following sequence of reactions? (1) (2) (3) (4)

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

Q36.Choose the correct order of density of the alkali metals (1) Li < K < Na < Rb < Cs (2) Li < Na < K < Rb < Cs (3) Li < Na < K < Cs < Rb (4) Cs < Rb < K < Na < Li

Q36.Lithium nitrate and sodium nitrate, when heated separately, respectively, give (1) LiNO2 and NaNO2 (2) Li2 O and Na2 O (3) Li2 O and NaNO2 (4) LiNO2 and Na2 O JEE Main 2022 (29 Jul Shift 1) JEE Main Previous Year Paper

Q36.Borazine, also known as inorganic benzene, can be prepared by the reaction of 3-equivalents of " X" with 6- equivalents of " Y". " X" and " Y", respectively are (1) B(OH)3 and NH3 (2) B2H6 and NH3 (3) B2H6 and HN3 (4) NH3 and B2O3

Q36.The correct order of density is (1) Be > Mg > Ca > Sr (2) Sr > Ca > Mg > Be (3) Sr > Be > Mg > Ca (4) Be > Sr > Mg > Ca

Q36.The incorrect statement about the imperfections in solids is (1) Schottky defect decreases the density of the (2) Frenkel defect does not alter the density of the substance. substance. (3) Interstitial defect increases the density of the (4) Vacancy defect increases the density of the substance. substance.

Q36.Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R. Assertion A : LiF is sparingly soluble in water. Reason R : The ionic radius of Li+ ion is smallest among its group members, hence has least hydration enthalpy. 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

Q36.In the following structures, which one is having staggered conformation with maximum dihedral angle? (1) (2) (3) (4)

Q36.Given below are two statements : Statement I : In 'Lassaigne's Test', when both nitrogen and sulphur are present in an organic compound, sodium thiocyanate is formed. Statement II : If both nitrogen and sulphur are present in an organic compound, then the excess of sodium used in sodium fusion will decompose the sodium thiocyanate formed to give NaCN and Na2 S . In the light of the above statements, choose the most appropriate answer from the options a: 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.

Q36.Which of the following statement is incorrect? (1) Low solubility of LiF in water is due to its small (2) KO2 is paramagnetic. hydration enthalpy. (3) Solution of sodium in liquid ammonia is (4) Sodium metal has higher density than potassium conducting in nature. metal

Q36.Which one of the following reactions indicates the reducing ability of hydrogen peroxide in basic medium? (1) HOCl + H2O2 →H3O+ + Cl−+ O2 (2) PbS + 4H2O2 →PbSO4 + 4H2O (3) 2 MnO−4 + 3H2O2 →2 MnO2 + 3O2 + 2H2O +(4)2 OH−Mn2+ + H2O2 →Mn4+ + 2 OH−

Q36.Identify the correct statement for B2H6 from those given below. (A) In B2H6 , all B −H bonds are equivalent. (B) In B2H6 , there are four 3-centre- 2-electron bonds. (C) B2H6 is a Lewis acid. (D) B2H6 can be synthesized from both BF3 and NaBH4 . (E) B2H6 is a planar molecule. Choose the most appropriate answer from the options given below : (1) (A) and (E) only (2) (B), (C) and (E) only (3) (C) and (D) only (4) (C) and (E) only

Q37.Portland cement contains 'X' to enhance the setting time. What is 'X'? 1 (1) CaSO4 · 2H2O (2) CaSO4 · 2H2O (3) CaSO4 (4) CaCO3

Q37.Match List-I with List-II List-I List-II (Mixture) (Purification Process) A Chloroform & Aniline I Steam distillation B Benzoic acid & Napthalene II Sublimation C Water & Aniline III Distillation D Napthalene & Sodium chloride IV Crystallisation (1) A −IV, B −III, C −I, D −II (2) A −III, B −I, C −IV, D −II (3) A −III, B −IV, C −II, D −I (4) A −III, B −IV, C −I, D −II

Q37.Given below are two statements: one is labelled as Assertion and the other is labelled as Reason. JEE Main 2022 (25 Jun Shift 2) JEE Main Previous Year Paper Assertion: A mixture contains benzoic acid and napthalene. The pure benzoic acid can be separated out by the use of benzene. Reason: Benzoic acid is soluble in hot water. In the light of the above statements, choose the most appropriate answer from the options given below. (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.

Q37.Given below are two statements: Statement I : The chlorides of Be and Al have Cl-bridged structure. Both are soluble in organic solvents and act as Lewis bases. Statement II: Hydroxides of Be and Al dissolve in excess alkali to give beryllate and aluminate ions. In the light of the above statements. Choose the correct answer from the options given below. JEE Main 2022 (27 Jul Shift 1) JEE Main Previous Year Paper (1) Both statement I and Statement II are true (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

Q37.Which will have the highest enol content? JEE Main 2022 (26 Jun Shift 1) JEE Main Previous Year Paper (1) (2) (3) (4)

Q37.Arrange the following in decreasing acidic strength. (1) A > B > C > D (2) B > A > C > D (3) D > C > A > B (4) D > C > B > A