Practice Questions

Q49.Which of the following is NOT an example of synthetic detergent? (1) (2) CH3 −(CH2)16 −COO−Na+ (3) (4) CH3 (CH2)16 COO (CH2 CH2 O)n CH2 CH2 OH

Q49.Which of the following is NOT a natural polymer? (1) Protein (2) Starch (3) Rubber (4) Rayon

Q49.Match the following correctly (i) Zymase (a) Stomach (ii) Urease (b) Yeast (iii) Diastase (c) Malt (iv) Pepsin (d)Soyabean (1) (i)-B; (ii) D(iii)-C; (iv)-A (2) (i)-B; (ii)-A; (iii)-C; (iv)-D (3) (i)-A; (ii)-B; (iii)-C; (iv)-D (4) (i)-D; (ii)-C; (iii)-B; (iv)-A

Q49.During the qualitative analysis of salt with cation y2+ , addition of a reagent (X) to alkaline solution of the salt gives a bright red precipitate. The reagent (X) and the cation (y2+) present respectively are : (1) Dimethylglyoxime and Ni2+ (2) Dimethylglyoxime and Co2+ (3) Nessler's reagent and Hg2+ (4) Nessler's reagent and Ni2+

Q49.Match List I with List II. List-I List-II (Anion) (gas evolved on reaction with dil. H2SO4 ) (A) CO2−3 (I) Colourless gas which turns lead acetate paper black. Colourless gas which turns acidified potassium dichromate (B) S2− (II) solution green. Brown fumes which turns acidified KI solution containing starch (C) SO2−3 (III) blue. gas evolved with brisk effervescence, which turns lime (D) NO−2 (IV)Colourless water milky. Choose the correct answer from the options given below (1) A −III, B −I, C −II, D −IV (2) A −II, B −I, C −IV, D −III (3) A −IV, B −I, C −III, D −II (4) A −IV, B −I, C −II, D −III

Q49.The structure shown below is of which well-known drug molecule? (1) Codeine (2) Morphine (3) Ranitidine (4) Cimetidine

Q50.A polysaccharide ' X ' on boiling with dil H2 SO4 at 393 K under 2 −3 atm pressure yields ' Y ' ' Y ' on treatment with bromine water gives gluconic acid. ' X ' contains β -glycosidic linkages only. Compound ' X ' is : (1) starch (2) cellulose (3) amylose (4) amylopectin Q51. 2O3(g) ⇌3O2(g) At 300 K, ozone is fifty percent dissociated. The standard free energy change at this temperature and 1 atm pressure is (−). . . . . . J mol−1 . (Nearest integer) [Given: ln 1. 35 = 0. 3 and R = 8. 3 J K−1 mol−1 ]

Q50.When sugar ' X ' is boiled with dilute H2 SO4 in alcoholic solution, two isomers ' A' and ' B' are formed. ' A' on oxidation with HNO3 yields saccharic acid where as ' B' is laevorotatory. The compound ' X' is (1) Maltose (2) Sucrose (3) Lactose (4) Strach

Q50.In the flame test of a mixture of salts, a green flame with blue centre was observed. Which one of the following cations may be present? JEE Main 2022 (24 Jun Shift 2) JEE Main Previous Year Paper (1) Calcium (2) Copper (3) Barium (4) Strontium

Q50.Glycosidic linkage between C1 of α -glucose and C2 of β -fructose is found in (1) Maltose (2) Sucrose (3) Lactose (4) amylose Q51. 56. 0 L of nitrogen gas is mixed with excess of hydrogen gas and it is found that 20 L of ammonia gas is produced, The volume of unused nitrogen gas is found to be_____ L.

Q50.A sugar ' X ' dehydrates very slowly under acidic condition to give furfural which on further reaction with resorcinol gives the coloured product after sometime. Sugar ' X ' is (1) Aldopentose (2) Aldotetrose (3) Oxalic acid (4) Ketotetrose

Q50.Stability of α - Helix structure of proteins depends upon (1) H -bonding interaction (2) dipolar interaction (3) van der Waals forces (4) π -stacking interaction

Q50.Which of the following is structure of a separating funnel? JEE Main 2022 (27 Jun Shift 1) JEE Main Previous Year Paper (1) (2) (3) (4)

Q50.Animal starch is the other name of (1) amylose (2) maltose (3) glycogen (4) amylopectin

Q50.Sugar moiety in DNA and RNA molecules respectively are JEE Main 2022 (29 Jun Shift 1) JEE Main Previous Year Paper (1) β −D −2−deoxyribose, β −D−deoxyribose (2) β −D−ribose, β −D −2 deoxyribose (3) β −D −2−deoxyribose, β −D−ribose (4) β −Ddeoxyribose, β −D −2 deoxyribose

Q50.The formulas of A and B for the following reaction sequence are (1) A = C7H14O8, B = C6H14 (2) A = C7H13O7, B = C7H14O (3) A = C7H12O8, B = C6H14 (4) A = C7H14O8, B = C6H14O6 Q51. 2 L of 0. 2 MH2 SO4 is reacted with 2 L of 0. 1 MNaOH solution, the molarity of the resulting product Na2 SO4 in the solution is____millimolar.

Q50.Which one of the following is a water soluble vitamin, that is not excreted easily? (1) Vitamin B2 (2) Vitamin B1 (3) Vitamin B6 (4) Vitamin B12 JEE Main 2022 (26 Jun Shift 2) JEE Main Previous Year Paper

Q50.Match List-I with List-II JEE Main 2022 (27 Jul Shift 2) JEE Main Previous Year Paper List-I List-II A Glucose + HI I Gluconic acid B Glucose + Br2 water II Glucose pentacetate C Glucose + acetic anhydride III Saccharic acid D Glucose + HNO3 IV Hexane Choose the correct answer from the options given below (1) A −IV, B −I, C −II, D −III (2) A −IV, B −III, C −II, D −I (3) A −III, B −I, C −IV, D −II (4) A −I, B −III, C −IV, D −II Q51. ​ In the above reaction, 5 g of toluene is converted into benzaldehyde with 92% yield. The amount of benzaldehyde produced is____ ×10−2 g

Q50.Given below are two statements. Statement I: Maltose has two α −D −glucose units linked at C1 and C4 and is a reducing sugar. Statement II: Maltose has two monosaccharides: α - D-glucose and β - D-glucose linked at C1 and C6 and it is a non-reducing sugar. In the light of the above statements, choose the correct answer from the options Question: given below. (1) Both Statement I and Statement II are true. (2) Both Statement I and Statement II are false. (3) Statement I is true but Statement II is false. (4) Statement I is false but Statement II is true. Q51. 116 g of a substance upon dissociation reaction, yields 7. 5 g of hydrogen, 60 g of oxygen and 48. 5 g of carbon. Given that the atomic masses of H, O and C are 1, 16 and 12, respectively. The data agrees with how many formulae of the following? A. CH3 COOH B. HCHO C. CH3 OOCH3 D. CH3 CHO

Q50.Which statement is not true with respect to nitrate ion test? (1) A dark brown ring is formed at the junction of (2) Ring is formed due to nitroferrous sulphate two solutions. complex. (3) The brown complex is [Fe (H2O)5(NO)] SO4 (4) Heating the nitrate salt with conc. H2 SO4 , light brown fumes are evolved.

Q50.Which one of the following is an example of artificial sweetner? (1) Bithional (2) Alitame (3) Lactose (4) Salvarsan

Q50.For the below given cyclic hemiacetal X, the correct pyranose structure is JEE Main 2022 (28 Jul Shift 1) JEE Main Previous Year Paper (1) (2) (3) (4)

Q50.During the denaturation of proteins, which of these structures will remain intact ? (1) Primary (2) Secondary (3) Tertiary (4) Quarternary

Q50.The structure of protein that is unaffected by heating is : (1) secondary structure (2) tertiary structure (3) primary structure (4) Quaternary structure

Q50.Given below are two statements. One is labelled as Assertion A and the other is labelled as Reason R. Assertion A : Amylose is insoluble in water. Reason R : Amylose is a long linear molecule with more than 200 glucose units. 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) Both A and R are correct and R is NOT the explanation of A. correct explanation of A. (3) A is correct but R is not correct. (4) A is not correct but R is correct.