Practice Questions

Q35.Which one of the following set of elements can be detected using sodium fusion extract? (1) Sulfur, Nitrogen, Phosphorus, Halogens (2) Phosphorus, Oxygen, Nitrogen, Halogens (3) Nitrogen, Phosphorus, Carbon, Sulfur (4) Halogens, Nitrogen, Oxygen, Sulfur

Q35.Statements about heavy water are given below. A. Heavy water is used in exchange reactions for the study of reaction mechanisms. B. Heavy water is prepared by exhaustive electrolysis of water. C. Heavy water has higher boiling point than ordinary water. D. Viscosity of H2O is greater than D2O. Choose the most appropriate answer from the options given below: (1) A and C only (2) A, B and C only (3) A and B only (4) A and D only

Q35.The correct statements about H2O2 are : (A) used in the treatment of effluents. (B) used as both oxidising and reducing agents. (C) the two hydroxyl groups lie in the same plane. (D) miscible with water. Choose the correct answer from the options given below : (1) (A), (B), (C) and (D) (2) (A), (B) and (D) only (3) (B), (C) and (D) only (4) (A), (C) and (D) only

Q35.The correct order of acid character of the following compounds is : (1) IV > III > II > I (2) II > III > IV > I (3) III > II > I > IV (4) I > II > III > IV

Q35.Reagent, 1−naphthylamine and sulphanilic acid in acetic acid is used for the detection of (1) N2O (2) NO−3 (3) NO (4) NO−2

Q35.A s-block element (M) reacts with oxygen to form an oxide of the formula MO2 . The oxide is pale yellow in colour and paramagnetic. The element (M) is: (1) Mg (2) Na (3) Ca (4) K

Q35.Match List - I with List - II. List-I (Salt) List-II (Flame colour wavelength) (a) LiCl (i) 455. 5 nm (b) NaCl (ii) 670. 8 nm (c) RbCl (iii) 780. 0 nm (d) CsCl (iv) 589. 2 nm Choose the correct answer from the options given below: (1) (a)-(iv), (b)-(ii), (c)-(iii), (d)-(i) (2) (a)-(i), (b)-(iv), (c)-(ii), (d)-(iii) (3) (a)-(ii), (b)-(i), (c)-(iv), (d)-(iii) (4) (a)-(ii), (b)-(iv), (c)-(iii), (d)-(i)

Q35.Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A): Barium carbonate is insoluble in water and is highly stable. Reason (R): The thermal stability of the carbonates increases with increasing cationic size. Choose the most appropriate answer from the options given below : JEE Main 2021 (26 Aug Shift 2) JEE Main Previous Year Paper (1) (A) is true but (R) is false. (2) Both (A) and (R) are true. (3) (A) is false but (R) is true. (4) Both (A) and (R) are false.

Q35.Given below are two statements : Statement I : Aniline is less basic than acetamide. Statement II : In aniline, the lone pair of electrons on nitrogen atom is delocalised over benzene ring due to resonance and hence less available to a proton. Choose the most appropriate option ; (1) Statement I is true but statement II is false. (2) Statement I is false but statement II is true. (3) Both statement I and statement II are true. (4) Both statement I and statement II are false.

Q35.Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Assertion (A): A simple distillation can be used to separate a mixture of propanol and propanone. Reason (R): Two liquids with a difference of more than 20°C in their boiling points can be separated by simple distillations. In the light of the above statements, choose the most appropriate answer from the options given below : (1) Both (A) and (R) are correct but (R) is not the (2) Both (A) and (R) are correct and (R) is the correct explanation of (A). correct explanation of (A). (3) (A) is true but (R) is false. (4) (A) is false but (R) is true.

Q35.Match List - I with List - II : List - I (Metal ion) List - II (Group in Qualitative analysis) (a) Mn2 + (i) Group - III (b) As3 + (ii) Group - IIA (c) Cu2 + (iii) Group - IV (d) Al3 + (iv) Group - IIB Choose the most appropriate answer from the options given below : (1) (a)-(iii), (b)-(iv), (c)-(ii), (d)-(i) (2) (a)-(iv), (b)-(ii), (c)-(iii), (d)-(i) (3) (a)-(i), (b)-(iv), (c)-(ii), (d)-(iii) (4) (a)-(i), (b)-(ii), (c)-(iii), (d)-(iv) JEE Main 2021 (31 Aug Shift 2) JEE Main Previous Year Paper

Q35.Which one among the following resonating structures is not correct? (1) (2) (3) (4)

Q35. Cu2+ salt reacts with potassium iodide to give (1) Cu2 I2 (2) Cu2 I3 (3) Cul (4) Cu (I3)2

Q35.The major product formed in the following reaction is: (1) (2) (3) (4)

Q35.Among the following, the aromatic compounds are : JEE Main 2021 (16 Mar Shift 1) JEE Main Previous Year Paper Choose the correct answer from the following options : (1) (A) and (B) only (2) (B) and (C) only (3) (B), (C) and (D) only (4) (A), (B) and (C) only

Q35.The major product (A) formed in the reaction given below is : (1) (2) (3) (4)

Q36. H+ / H2O In the following sequence of reactions, C3H6 ⟶ A KIO + C. The compounds B and C respectively are : dilKOHB JEE Main 2021 (01 Sep Shift 2) JEE Main Previous Year Paper (1) CI3COOK, CH3I (2) CH3I, HCOOK (3) CI3COOK, HCOOH (4) CHI3, CH3COOK

Q36.Which of the following is an aromatic compound? JEE Main 2021 (17 Mar Shift 1) JEE Main Previous Year Paper (1) (2) (3) (4)

Q36.Which of the following forms of hydrogen emits low energy β− particles? (1) Deuterium 21H (2) Proton H+ (3) Tritium 31H (4) Protium 11H

Q36.Given below are two statements : Statement I : C2H5 OH and AgCN both can generate nucleophile. Statement II : KCN and AgCN both will generate nitrile nucleophile with all reaction conditions. Choose the most appropriate option : (1) Statement I is true but statement II is false (2) Both statement I and statement II are true (3) Statement I is false but statement II is true (4) Both statement I and statement II are false

Q36.The gas ′A′ is having very low reactivity reaches to stratosphere. It is non-toxic and non-flammable but dissociated by UV -radiations in stratosphere. The intermediates formed initially from the gas ′A′ are: (1) (2) (3) (4)

Q36. Among the given species the Resonance stabilised carbocations are: (1) (C) and (D) only (2) (A), (B) and (D) only (3) (A) and (B) only (4) (A), (B) and (C) only

Q36.Given below are two statements : Statement I : Hyperconjugation is a permanent effect. + Statement II : Hyperconjugation in ethyl cation − involves the overlapping of Csp2 −H1 s bond (CH3 CH2) with empty 2p orbital of other carbon. Choose the correct option: (1) Both statement I and statement II are false (2) Statement I is incorrect but statement II is true (3) Statement I is correct but statement II is false (4) Both Statement I and statement II are true.

Q36.Find A, B and C in the following reactions: NH3 + A + CO2 →(NH4)2 CO3 (NH4)2 CO3 + H2O + B →NH4 HCO3 NH4 HCO3 + NaCl →NH4 Cl + C (1) A −H2O; B −CO2; C −NaHCO3 (2) A −H2O; B −O2; C −Na2 CO3 (3) A −H2O; B −O2; C −NaHCO3 (4) A −O2; B −CO2; C −Na2 CO3

Q36.An organic compound 'A' C4H8on treatment with KMnO4 / H+ yields compound 'B' C3H6O. Compound 'A' also yields compound 'B' an ozonolysis. Compound 'A' is : (1) 2-Methylpropene (2) 1-Methylcyclopropane (3) But-2-ene (4) Cyclobutane