Practice Questions

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.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.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.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

Q36.s-block element which cannot be qualitatively confirmed by the flame test is (1) Li (2) Na (3) Rb (4) Be JEE Main 2022 (26 Jun Shift 2) 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 products obtained during treatment of hard water using Clark's method are (1) CaCO3 and MgCO3 (2) Ca (OH)2 and Mg (OH)2 (3) CaCO3 and Mg (OH)2 (4) Ca (OH)2 and MgCO3

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.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.Hydrogen has three isotopes : protium (1H) , deuterium ( 2H or D ) and tritium ( 3H or T). They have nearly same chemical properties but different physical properties. They differ in (1) Number of protons (2) Atomic number (3) Electronic configuration (4) Atomic mass

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.Given below are two statements. Statement I : Stannane is an example of a molecular hydride. Statement II : Stannane is a planar molecule. In the light of the above statement, choose the most appropriate answer from the options given below (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.

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

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

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.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.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.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.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

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.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.Which one of the following compounds is used as a chemical in certain type of fire extinguishers (1) Washing soda (2) Baking soda (3) Caustic soda (4) Soda ash

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.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.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