Practice Questions

Q42.The concentration of dissolved Oxygen in water for growth of fish should be more than X ppm and ¯ Biochemical Oxygen Demand in clean water should be less than Y ppm. X and Y in ppm are, respectively. ¯ (1) X Y (2) X Y 6 5 4 8 (3) X Y (4) X Y 4 15 6 12

Q43.In Dumas method for the estimation of N2 , the sample is heated with copper oxide and the gas evolved is passed over: (1) Copper gauze (2) Pd (3) Ni (4) Copper oxide

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.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 +

Q43.Nd2 + = ______ (1) 4f26s2 (2) 4f4 (3) 4f3 (4) 4f46s2

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 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

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

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

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

Q48.Match List I with List II List II List II (A) Tranquilizers (I) Anti blood clotting (B) Aspirin (II) Salvarsan (C) Antibiotic (III) Antidepressant drugs (D) Antiseptic (IV) Soframicine Choose the correct answer from the options given below: (1) (A)–IV, (B)–II, (C)–I, (D)–III (2) (A)–II, (B)–I, (C)–III, (D)–IV (3) (A)–III, (B)–I, (C)–II, (D)–IV (4) (A)–II, (B)–IV, (C)–I, (D)–III

Q48.The major component of which of the following ore is sulphide based mineral? (1) Calamine (2) Siderite (3) Sphalerite (4) Malachite

Q48.Amongst the following compounds, which one is an antacid? (1) Ranitidine (2) Meprobamate (3) Terfenadine (4) Brompheniramine

Q49.Which of the following artificial sweeteners has the highest sweetness value in comparison to cane sugar? (1) Aspartame (2) Sucralose (3) Alitame (4) Saccharin