Practice Questions

Q43.Match List I with List II List-I List-2 Species Maximum allowed concentration in ppm in drinking water A F− I < 50 ppm JEE Main 2023 (08 Apr Shift 1) JEE Main Previous Year Paper B SO2−4 II < 5 ppm C NO−3 III < 2 ppm D Zn IV < 500 ppm Choose the correct answer from the options given below. (1) A-I, B-II, C-III, D-IV (2) A-II, B-I, C-III, D-IV (3) A-IV, B-III, C-II, D-I (4) A-III, B-II, C-I, D-IV

Q43.Prolonged heating is avoided during the preparation of ferrous ammonium sulphate to (1) Prevent hydrolysis (2) Prevent reduction (3) Prevent breaking (4) Prevent oxidation

Q43.Given below are two statements: One is labelled as Assertion A and the other is labelled as Reason R. Assertion A: can be easily reduced using Zn −Hg / HCl to Reason R: Zn −Hg / HCl is used to reduce carbonyl group to – CH2 – 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) A is true but R is false (3) Both A and R are true but R is not the correct (4) Both A and R are true and R is the correct explanation of A explanation of A

Q43.Given below are two statements, one is labelled as Assertion A and the other is labelled as Reason R . Assertion A: can be subjected to Wolff-Kishner reduction to give Reason R: Wolff-Kishner reduction is used to convert into In the light of the above statements, choose the correct answer from the options given below: (1) A is true but R is false (2) A is false but R is true (3) Both A and R are true and R is the correct (4) Both A and R are true and R is NOT the correct explanation of A explanation of A

Q43.The magnetic moment of a transition metal compound has been calculated to be 3 . 87 BM. The metal ion is (1) Cr2 + (2) Mn2 + (3) V2 + (4) Ti2 +

Q44.Three organic compounds A, B and C were allowed to run in thin layer chromatography using hexane and gave the following result (see figure). The Rf value of the most polar compound is _____ ×10–2

Q44.Match List I with List II. List I List II A.van't Hoff I. Cryoscopic constant factor, i B. kf II. Isotonic solutions Solutions with same C. III. Normal molar mass osmotic pressure Abnormal molar mas Solutions with same composition D.Azeotropes IV. of vapour above it Choose the correct answer from the options given below: (1) A-III, B-I, C-II, D-IV (2) A-III, B-II, C-I, D-IV (3) A-III, B-I, C-IV, D-II (4) A-I, B-III, C-II, D-IV

Q44.The covalency and oxidation state respectively of boron in BF4 -, are (1) 3 and 5 (2) 3 and 4 (3) 4 and 4 (4) 4 and 3

Q44.The group of chemicals used as pesticide is (1) Aldrin, Sodium Chlorate, Sodium arsinite (2) DDT, Aldrin (3) Sodium chlorate, DDT, PAN (4) Dieldrin, Sodium arsinite, Tetrachloroethene

Q44.The industrial activity held least responsible for global warming is : (1) manufacturing of cement (2) steel manufacturing (3) Electricity generation in thermal power plants. (4) Industrial production of urea

Q44.The water quality of a pond was analysed and its BOD was found to be 4. The pond has (1) Highly polluted water (2) Water has high amount of fluoride compounds (3) Very clean water (4) Slightly polluted water

Q44.The primary and secondary valencies of cobalt respectively in Co ( NH3 ) 5ClCl2 are: (1) 3 and 5 (2) 2 and 6 (3) 2 and 8 (4) 3 and 6

Q45. (i) O3 −2 −hexene → Products (ii) H2O The two products formed in above reaction are (1) Butanal and acetaldehyde (2) Butanoic acid and acetaldehyde (3) Butanal and acetic acid (4) Butanoic acid and acetic acid

Q45.The radical which mainly causes ozone depletion in the presence of UV radiations is : (1) Cl⋅ (2) NO⋅ ⋅ ⋅ (3) OH (4) CH 3

Q45.The set which does not have ambidentate ligand(s) is (1) C2O42 - , ethylene diammine, H2O (2) EDTA 4 - , NCS-, C2O42 - (3) NO2- , C2O42 - , EDTA 4- (4) C2O42 - , NO2- , NCS-

Q45.For the first order reaction A →B the half life is 30 min. The time taken for 75% completion of the reaction is mm. (Nearest integer) Given : log 2 = 0. 3010 log 3 = 0. 4771 log 5 = 0. 6989

Q45.Which of the following compounds is an example of Freon? (1) C2H2 F2 (2) C2 F4 (3) C2 HF3 (4) C2 Cl2 F2

Q45.The normal rain water is slightly acidic and its pH value is 5. 6 because of which one of the following ? (1) CO2 + H2O →H2 CO3 (2) N2O5 + H2O →2 HNO3 (3) 2 SO2 + O2 + 2H2O →2H2 SO4 (4) 4 NO2 + O2 + 2H2O →4 HNO3

Q46.The number of units, which are used to express concentration of solutions from the following is _________. (Mass percent, Mole, Mole fraction, Molarity, ppm, Molality.)

Q46.For conversion of compound A →B, the rate constant of the reaction was found to be 4. 6 × 10−5 Lmol −1 s−1 . The order of the reaction is _____ .

Q46.Which of these reactions is not a part of breakdown of ozone in stratosphere? (1) ⊙ ⊙ (2) ⊙ ⊙ 2 Cl O(g) →ClO2(g) + Cl(g) ClO(g) + O(g) →O2(g) + Cl (3) ⊙ ⊙ (4) uv ⊙ ⊙ Cl(g) + O3(g) →O2(g) + ClO(g) CF2 Cl2(g) → Cl(g) + CF2 Cl(g)

Q47.Suitable reaction condition for preparation of Methyl phenyl ether is (1) PhO⊝Na⊕, MeOH (2) Benzene, MeBr (3) Ph - Br, MeO⊖Na⊕ (4) PhO⊝Na⊕, MeBr

Q47.Caprolactam when heated at high temperature in presence of water, gives (1) Teflon (2) Dacron (3) Nylon 6, 6 (4) Nylon 6

Q47.The product, which is not obtained during the electrolysis of brine solution is (1) H2 (2) HCl (3) NaOH (4) Cl2

Q47.The water gas on reacting with cobalt as a catalyst forms (1) Methanal (2) Methanoic acid (3) Ethanol (4) Methanol