Practice Questions

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. A2 + B2 →2 AB. ΔHf = −200 kJ mol−1 AB, A2 and B2 are diatomic molecules. If the bond enthalpies of A2, B2 and AB are in the ratio 1 : 0. 5 : 1, then the bond enthalpy of A2 is _________kJ mol–1 (Nearest integer) Q39. 25. 0 mL of 0. 050 M Ba (NO3)2 is mixed with 25. 0 mL of 0. 020 M NaF. Ksp of BaF2 is 0. 5 × 10–6 at 298K. The ratio of [Ba2+][F−]2 and Ksp is ______.

Q38.Which hydride among the following is less stable? (1) BeH2 (2) HF (3) NH3 (4) LiH

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.Given below are two statements, one is labelled as Assertion A and the other is labelled as Reason R. Assertion A : Order of acidic nature of the following compounds is A > B > C. Reason R: Fluoro is a stronger electron withdrawing group than Chloro group. In the light of the above statements, choose the correct answer from the options given below : (1) A is false but R is true (2) Both A and R are correct and R is the correct explanation of A (3) A is true but R is false (4) Both A and R are correct but R is NOT the correct explanation of A

Q39.Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A): Gypsum is used for making fireproof wall boards. Reason (R): Gypsum is unstable at high temperatures. In the light of the above statements, choose the correct answer from 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).

Q39.Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason 𝑅 Assertion A: In an Ellingham diagram, the oxidation of carbon to carbon monoxide shows a negative slope with respect to temperature. Reason R: CO tends to get decomposed at higher temperature. 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) A is not correct but R is correct explanation of A (3) (3) Both A and R are correct but R is NOT the (4) A is correct but R is not correct correct explanation of A

Q39.Given below are two statements: Statement I : Nickel is being used as the catalyst for producing syn gas and edible fats. Statement II : Silicon forms both electron rich and electron deficient hydrides. In the light of the above statements, choose the most appropriate answer from the options given below: (1) Both the statements I and II are correct (2) Statement I is incorrect but statement II is correct (3) Both the statements I and II are incorrect (4) Statement I is correct but statement II is incorrect

Q39.Given below are two statements : Statement I : H2O2 is used in the synthesis of Cephalosporin Statement II : H2O2 is used for the restoration of aerobic conditions to sewage wastes. In the light of the above statements, choose the most appropriate answer from the options given below : (1) Statement I is correct but Statement II is (2) Both Statement I and Statement II are correct incorrect (3) Statement I is incorrect but Statement II is (4) Both Statement I and Statement II are incorrect correct

Q39.Alkali metal from the following with least melting point is (1) Cs (2) Rb (3) Na (4) K

Q39.The major product 'P' formed in the given reaction is JEE Main 2023 (10 Apr Shift 1) JEE Main Previous Year Paper (1) (2) (3) (4)

Q39.The magnetic behaviour of Li2 O, Na2 O2 and KO2 , respectively, are (1) diamagnetic, paramagnetic and diamagnetic (2) paramagnetic, paramagnetic and diamagnetic (3) paramagnetic, diamagnetic and paramagnetic (4) diamagnetic, diamagnetic and paramagnetic

Q39.The standard electrode potential of M+ / M in aqueous solution does not depend on (1) Hydration of a gaseous metal ion (2) Sublimation of a solid metal (3) Ionisation of a solid metal atom (4) Ionisation of a gaseous metal atom

Q39.Which of the following represents the correct order of metallic character of the given elements? (1) Si < Be < Mg < K (2) Be < Si < Mg < K (3) K < Mg < Be < Si (4) Be < Si < K < Mg

Q39.The methods NOT involved in concentration of ore are (A) Liquation (B) Leaching (C) Electrolysis (D) Hydraulic washing (E) Froth floatation Choose the correct answer from the options given below: (1) B, D and C only (2) C, D and E only (3) A and C only (4) B, D and E only

Q39.The compound which will have the lowest rate towards nucleophilic aromatic substitution on treatment with OH– is JEE Main 2023 (25 Jan Shift 1) JEE Main Previous Year Paper (1) (2) (3) (4)

Q39.Arrange the following compounds in increasing order of rate of aromatic electrophilic substitution reaction. (1) d, b, c, a (2) d, b, a, c (3) b, c, a, d (4) c, a, b, d

Q39.Match List I with List II List I List II Type of Hydride Example A Electron deficient hydride I MgH2 B Electron rich hydride II HF C Electron precise hydride III B2H6 D Saline hydride IV CH4 Choose the correct answer from the options given below : (1) A-III, B-II, C-IV, D-I (2) A-II, B-III, C-I, D-IV (3) A-II, B-III, C-IV, D-I (4) A-III, B-II, C-I, D-IV

Q39.Given below are two statements : Statement I : Tropolone is an aromatic compound and has 8𝜋 electrons. Statement II : 𝜋 electrons of > C = O group in tropolone is involved in aromaticity. In the light of the above statements choose the correct answer from the options given below: (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 false (4) Both Statement I and Statement II are true

Q39.Identify the correct statements about alkali metals. A. The order of standard reduction potential (M+ | M) for alkali metal ions is Na > Rb > Li. B. CsI is highly soluble in water. C. Lithium carbonate is highly stable to heat. D. Potassium dissolved in concentrated liquid ammonia is blue and paramagnetic. E. All alkali metal hydrides are ionic solids. Choose the correct answer from the options given below (1) A, B, D only (2) C and E only (3) A and E only (4) A, B and E only

Q39.Boric acid in solid, whereas BF3 is gas at room temperature because of (1) Strong ionic bond in Boric acid (2) Strong van der Waal's interaction in Boric acid (3) Strong hydrogen bond in Boric acid (4) Strong covalent bond in BF3

Q39.The solubility product of BaSO4 is 1 × 10−10 at 298 K. The solubility of BaSO4 in 0. 1M K2 SO4(aq) solution is ------ ×10−9 g L−1 (nearest integer). Given: Molar mass of BaSO4 is 233 g mol−1

Q39.Statement I: For colloidal particles, the values of colligative properties are of small order as compared to values shown by true solutions at same concentration. Statement II: For colloidal particles, the potential difference between the fixed layer and the diffused layer of same charges is called the electrokinetic potential or zeta potential. In the light of the above statements, chooses the correct answer from the options given below. (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

Q40.In the extraction of copper, its sulphide ore is heated in a reverberatory furnace after mixing with silica to: (1) separate CuO as CuSiO3 (2) remove calcium as CaSiO3 (3) decrease the temperature needed for roasting of (4) remove FeO as FeSiO3 Cu2S

Q40.The correct order of bond enthalpy ( kJ mol–1 ) is: (1) Si −Si > C −C > Sn −Sn > Ge −Ge (2) Si −Si > C −C > Ge −Ge > Sn −Sn (3) C −C > Si −Si > Sn −Sn > Ge −Ge (4) C −C > Si −Si > Ge −Ge > Sn −Sn