Practice Questions

Q35.Reaction of BeO with ammonia and hydrogen fluoride gives 'A' which on thermal decomposition gives BeF2 and NH4F. What is 'A' ? (1) H3NBeF3 (2) NH42BeF4 (3) NH4BeF3 (4) NH42Be2F6

Q35. ClF5 at room temperature is a (1) Colourless liquid with trigonal (2) Colourless gas with square pyramidal geometry bipyramidal geometry (3) Colourless gas with trigonal bipyramidal (4) Colourless liquid with square pyramidal geometry geometry

Q35.Match items of column I and II Column I (Mixture of compounds) Column II (Separation Technique) A. H2O / CH2Cl2 i. Crystallization ii. Differential solvent extraction B. C. Kerosene/Naphthalene iii. Column chromatography D. C6H12O6 / NaCl iv. Fractional Distillation (1) A - ( iii ) , B - ( iv ) , C - ( ii ) , D - ( i ) (2) A - ( ii ) , B - ( iii ) , C - ( iv ) , D - ( i ) (3) A - ( i ) , B - ( iii ) , C - ( ii ) , D - ( iv ) (4) A - ( ii ) , B - ( iv ) , C - ( i ) , D - ( iii )

Q36.Among the following compounds, the one which shows highest dipole moment is (1) (2) (3) (4)

Q36.Match List-I with List-II: List-I List-II A. K I. Thermonuclear reactions B. KCI II. Fertilizer C. KOH III. Sodium potassium pump D. Li IV. Absorbent of CO2 (1) A(III), B(II), C(IV), D(I) (2) A(III), B(IV), C(II), D(I) (3) A(IV), B(I), C(III), D(II) (4) A(IV), B(III), C(I), D(II)

Q36.Match List-I with List-II. List-I List-II Element detected Reagent used/Product formed A Nitrogen I Na2FeCN5NO B Sulphur II AgNO3 C Phosphorus III Fe4FeCN63 D Halogen IV NH42MoO4 Choose the correct answer from the options given below: (1) A →III; B →I; C →IV; D →II (2) A →II; B →IV; C →I; D → III (3) A →IV; B →II; C →I; D →III (4) A →II; B →I; C →IV; D →III

Q36.Match List I with List II List I List II Elements Colour imparted to the flame A K I Brick Red B Ca II Violet C Sr III Apple Green D Ba IV Crimson Red Choose the correct answer from the options given below: (1) A-II, B-I, C-III, D-IV (2) A-II, B-IV, C-I, D-III (3) A-II, B-I, C-IV, D-III (4) A-IV, B-III, C-II, D-I

Q36.Increasing order of stability of the resonance structure is: JEE Main 2023 (24 Jan Shift 1) JEE Main Previous Year Paper (1) C, D, B, A (2) C, A, B, D (3) D, C, A, B (4) D, C, B, A

Q37.Incorrect statement for the use of indicator in acid-base titration is: JEE Main 2023 (31 Jan Shift 2) JEE Main Previous Year Paper (1) Methyl orange may be used for a weak acid vs (2) Phenolphthalein may be used for a strong acid vs weak bas titration. strong base titration. (3) Methyl orange is a suitable indicator for a strong (4) Phenolphthalein is a suitable indicator for a weak acid vs weak base titration. acid vs strong base titration.

Q37.What is the correct order of acidity of the protons marked 𝐴– 𝐷 in the given compounds? (1) HC > HD > HB > HA (2) HC > HD > HA > HB (3) HD > HC > HB > HA (4) HC > HA > HD > HB

Q37.An indicator ‘ X’ is used for studying the effect of variation in concentration of iodide on the rate of reaction of iodide ion with H2O2 at room temp. The indicator ‘ X’ forms blue colored complex with compound ‘ A’ present in the solution. The indicator ‘ X’ and compound ‘ A’ respectively are (1) Starch and iodine (2) Methyl orange and H2O2 (3) Starch and H2O2 (4) Methyl orange and iodine

Q37. Where Nu = Nucleophile Find out the correct statement from the options given below for the above two reactions. JEE Main 2023 (11 Apr Shift 1) JEE Main Previous Year Paper (1) Reaction (I) is of 2nd order and reaction (II) is of (2) Reactions (I) and (II) both are of 2nd order 1st order (3) Reactions (I) is of 1st order and reaction (II) is of (4) Reaction (I) and (II) both are of 1st order 2 nd order

Q37.The major product for the following reaction is : JEE Main 2023 (13 Apr Shift 2) JEE Main Previous Year Paper (1) (2) (3) (4)

Q37.The incorrect statements from the following is: A. The electrical work that a reaction can perform at constant pressure and temperature is equal to the reaction Gibbs energy. B. E∘cell is dependent on the pressure. ° ΔrS° C. dE cell = dT nF D. A cell is operating reversibly if the cell potential is exactly balanced by an opposing source of potential difference. JEE Main 2023 (08 Apr Shift 2) JEE Main Previous Year Paper

Q37.Given below are two statements, one is labelled as Assertion A and the other is labelled as Reason R Assertion A:- The alkali metals and their salts impart characteristic colour to reducing flame. Reason R:- Alkali metals can be detected using flame tests. In the light of the above statements, choose the most appropriate answer form the options given below (1) Both A and R are correct but R is NOT the (2) A is correct but R is not correct. correct explanation of A. (3) A is not correct but R is correct (4) Both A and R are correct and R is the correct explanation of A.

Q37.Which of the following represents the lattice structure of A0 . 95O containing A2 + , A3 + and O2 – ions? A. JEE Main 2023 (01 Feb Shift 1) JEE Main Previous Year Paper B. C. (1) B and C only (2) B only (3) A and B only (4) A only

Q37.Which one of the following statements is correct for electrolysis of brine solution? (1) Cl2 is formed at cathode (2) O2 is formed at cathode (3) H2 is formed at anode (4) OH-is formed at cathode

Q38.The major products ‘A’ and ‘B’, respectively, are (1) (2) (3) (4)

Q38.In which of the following reactions the hydrogen peroxide acts as a reducing agent? (1) PbS + 4H2O2 →PbSO4 + 4H2O (2) 2 Fe2+ + H2O2 →2 Fe3+ + 2 OH− (3) HOCl + H2O2 →H3O+ + Cl−1 + O2 (4) Mn2+ + H2O2 →Mn4+ + 2 OH−

Q38.The decreasing order of hydride affinity for following carbocations is: (a) (2) (3) (4) Choose the correct answer from the options given below: (1) C, A, D, B (2) C, A, B, D (3) A, C, D, B (4) A, C, B, D

Q38.The starting material for convenient preparation of deuterated hydrogen peroxide (D2O2) in laboratory is: (1) K2 S2O8 (2) 2-ethylanthraquinol (3) BaO2 (4) BaO

Q38.Which of the following reaction is correct? (1) Δ (2) Δ 2 LiNO3 →2 LiNO2 + O2 4 LiNO3 →2 Li2 O + 2N2O4 + O2 (3) Δ (4) Δ 4 LiNO3 →2 Li2 O + 4 NO2 + O2 2 LiNO3 →2Li + 2 NO2 + O2

Q38.During the reaction of permanganate with thiosulphate, the change in oxidation of manganese occurs by value of 3. Identify which of the below medium will favour the reaction. (1) Both aqueous acidic and neutral (2) Aqueous neutral (3) Both aqueous acidic and faintly alkaline (4) Aqueous acidic

Q38.Decreasing order of reactivity towards electrophilic substitution for the following compounds is: (1) d > a > e > c > b (2) e > d > a > b > c (3) a > d > e > b > c (4) c > b > a > d > e

Q38.In the depression of freezing point experiment A. Vapour pressure of the solution is less than that of pure solvent B. Vapour pressure of the solution is more than that of pure solvent C. Only solute molecules solidify at the freezing point D. Only solvent molecules solidify at the freezing point (1) A and D only (2) B and C only (3) A and C only (4) A only