Practice Questions

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

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.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.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.Which of the following compounds is an example of hypnotic drug? (1) Seldane (2) Amytal (3) Aspartame (4) Prontosil

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.Which of the following is reducing sugar? JEE Main 2022 (26 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.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.The structure of protein that is unaffected by heating is : (1) secondary structure (2) tertiary structure (3) primary structure (4) Quaternary structure

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.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.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.An antiseptic dettol is a mixture of two compounds 'A' and 'B' where A has 6π electrons and B has 2π electrons. What is B? (1) Bithional (2) Terpineol (3) Chlorophenol (4) Chloroxyenol

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

Q31.The correct order of ionic radii for the ions, P3−, S2−, Ca2+, K+, Cl− is : (1) P3−> S2−> Cl−> K+ > Ca2+ (2) P3−> S2−> Cl−> Ca2+ > K+ (3) Cl−> S2−> P3−> Ca2+ > K+ (4) K+ > Ca2+ > P3−> S2−> Cl−

Q31.Outermost electronic configuration of a group 13 element, E, is 4 s2, 4p1. The electronic configuration of an element of p-block period-five placed diagonally to element, E is: (1) [Kr]3 d104 s24p2 (2) [Ar]3 d104 s24p2 (3) [Xe]5 d106 s26p2 (4) [Kr]4 d105 s25p2

Q31.The incorrect expression among the following is : ΔH° - TΔS° (1) For isothermal process (2) lnK = RT Vf wreversible = - nRT ln Vi ΔGSystem / RT (3) = - T (at constant P) (4) K = e-ΔG° ΔSTotal

Q31.The unit of the van der Waals gas equation parameter ′a′ in (P + an2V2 )(V −nb) (1) dm3 mol−1 (2) kg ms−1 (3) atm dm6 mol−2 (4) kg ms−2

Q31. The class of drug to which chlordiazepoxide with above structure belongs is : (1) Analgesic (2) Tranquillizer (3) Antacid (4) Antibiotic

Q31.The orbital having two radial as well as two angular nodes is: (1) 5d (2) 4d (3) 4f (4) 3p

Q31.Which one of the following statements for D.I. Mendeleeff, is incorrect ? (1) He authored the textbook - Principles of (2) At the time, he proposed Periodic Table of Chemistry. elements structure of atom was known. (3) Element with atomic number 101 is named after (4) He invented accurate barometer. him. JEE Main 2021 (22 Jul Shift 1) JEE Main Previous Year Paper