Practice Questions

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

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.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.The correct order for acidity of the following hydroxyl compound is (A) CH3OH (B) CH33COH (C) (D) (E) Choose the correct answer from the options given below: (1) C > E > D > B > A (2) E > D > C > B > A (3) D > E > C > A > B (4) E > C > D > A > B

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.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.Formation of photochemical smog involves the following reaction in which A, B and C are respectively. hu (i) NO2 ⟶A + B JEE Main 2023 (30 Jan Shift 1) JEE Main Previous Year Paper (ii) B + O2 →C (iii) A + C →NO2 + O2 Choose the correct answer from the options given below: (1) O, NO and NO3- (2) O, N2O and NO (3) N, O2 and O3 (4) NO, O and O3

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.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.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.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.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 : 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.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)

Q40.Match List I with List II. List I List II A. Reverberatory furnace I. Pig iron B. Electrolytic cell II. Aluminium C. Blast furnace III. Silicon D. Zone refining furnace IV. Copper JEE Main 2023 (24 Jan Shift 1) JEE Main Previous Year Paper (1) A - IV, B - II, C - I, D - III (2) A - I, B - IV, C - II, D - III (3) A - I, B - III, C - II, D - IV (4) A - III, B - IV, C - I, D - II

Q40.The correct order of hydration enthalpies is (A) K+ (B) Rb+ (C) Mg2+ JEE Main 2023 (29 Jan Shift 1) JEE Main Previous Year Paper (D) Cs+ (E) Ca2+ Choose the correct answer from the options given below: (1) C > A > E > B > D (2) E > C > A > B > D (3) C > E > A > D > B (4) C > E > A > B > D

Q40.Ion having highest hydration enthalpy among the given alkaline earth metal ions is: (1) Be2+ (2) Sr2+ (3) Ba2+ (4) Ca2+

Q40.The possibility of photochemical smog formation will be minimum at (1) Srinagar, Jammu and Kashmir in January (2) Kolkata in October (3) Mumbai in May (4) New-Delhi in August (Summer)

Q40.Which of the following are the Green house gases? A. Water vapour B.Ozone C.I2 D.Molecular hydrogen Choose the most appropriate answer from the options given below : (1) A and D only (2) B and C only (3) A and B only (4) C and D only

Q40.The most stable carbocation for the following is: (1) c (2) d (3) b (4) a

Q40. The correct sequence of reagents for the preparation of Q and R is: (1) (i) Cr2 O3, 770 K, 20 atm ; (ii) (2) (i) CrO2 Cl2, H3O+ ; (ii) CrO2 Cl2, H3O+ ; (iii) NaOH ; (iv) H3O+ Cr2 O3, 770 K, 20 atm; (iii) NaOH; (iv) H3O+ (3) (i) KMnO4, OH− ; (ii) Mo2 O3, Δ; (iii) NaOH; (4) (i) Mo2 O3, Δ; (ii) CrO2 Cl2, H3O+ ; (iii) (iv) H3O+ NaOH; (iv) H3O+

Q40. KMnO4 is titrated with ferrous ammonium sulphate hexahydrate in presence of dilute H2 SO4. Number of water molecules produced for 2 molecules of KMnO4 is _______ Q41. 20 mL of calcium hydroxide was consumed when it was reacted with 10 mL of unknown solution of H2 SO4. Also 20 mL standard solution of 0. 5 M HCl containing 2 drops of phenolphthalein was titrated with calcium hydroxide, the mixture showed pink colour when burette displayed the value of 35. 5 mL whereas the burette showed 25. 5 mL initially. The concentration of H2 SO4 is _______M. (Nearest integer)

Q40.The element playing significant role in neuromuscular function and interneuronal transmission is : (1) Be (2) Mg (3) Ca (4) Li

Q40.Given below are two statements, one is labelled as Assertion A and the other is labelled as Reason R Assertion A :- Carbon forms two important oxides CO and CO2 . CO is neutral whereas CO2 is acidic in nature. Reason R : CO2 can combine with water in a limited way to form carbonic acid, while CO is sparingly soluble in water. 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 correct explanation of A. explanation of A. (3) A is not correct but R is correct. (4) A is correct but R is not correct.