Practice Questions

Q49.In polymer Buna- S :′S′ stands for: (1) Strength (2) Sulphur (3) Sulphonation (4) Styrene

Q49.To an aqueous solution containing ions such as Al3+, Zn2+, Ca2+, Fe3+, Ni2+, Ba2+ and Cu2+ was added conc. HCl, followed by H2S . The total number of cations precipitated during this reaction is/are : (1) 1 (2) 3 (3) 4 (4) 2

Q49.Identify A in the following reaction. (1) (2) (3) (4)

Q49.The structure of Neoprene is : (1) (2) (3) (4)

Q49.Match List- I with List- II. JEE Main 2021 (26 Feb Shift 2) JEE Main Previous Year Paper List- I List- II (a) Sucrose (i) β −D−Galactose and β −D−Glucose (b) Lactose (ii) α −D−Glucose and β −D−Fructose (c) Maltose (iii) α −D−Glucose and α −D−Glucose Choose the correct answer from the options given below: (1) (a) →(iii), (b) →(ii), (c) →(i) (2) (a) →(iii), (b) →(i), (c) →(ii) (3) (a) →(ii), (b) →(i), (c) →(iii) (4) (a) →(i), (b) →(iii), (c) →(ii)

Q49.Bakelite is a cross-linked polymer of formaldehyde and: (1) PHBV (2) Buna-S (3) Novolac (4) Dacron

Q49.Which statement is correct? JEE Main 2021 (25 Feb Shift 1) JEE Main Previous Year Paper (1) Synthesis of Buna- S needs nascent oxygen. (2) Buna- S is a synthetic and linear thermosetting polymer. (3) Buna- N is a natural polymer. (4) Neoprene is an addition copolymer used in plastic bucket manufacturing.

Q49.A biodegradable polyamide can be made from: (1) Glycine and isoprene (2) Hexamethylene diamine and adipic acid (3) Glycine and aminocaproic acid (4) Styrene and caproic acid

Q50.Which of the following vitamin is helpful in the blood clotting? (1) Vitamin C (2) Vitamin E (3) Vitamin K (4) Vitamin B

Q50.A non-reducing sugar A hydrolyses to give two reducing mono saccharides. Sugar A is (1) Fructose (2) Galactose (3) Glucose (4) Sucrose Q51.______grams of 3−Hydroxy propanal (MW = 74) must be dehydrated to produce 7. 8 g of acrolein (MW = 56)(C3H4O) if the percentage yield is 64. (Round off to the Nearest Integer). [Given: Atomic masses : C : 12. 0u, H : 1. 0u, O : 16. 0u]

Q50.The water soluble protein is: (1) Fibrin (2) Albumin (3) Myosin (4) Collagen

Q50.Match List - I with List - II. List-I List-II (a) Valium (i) Antifertility drug (b) Morphine (ii) Pernicious anaemia (c) Norethindrone (iii) Analgesic (d) Vitamin B12 (iv) Tranquilizer JEE Main 2021 (24 Feb Shift 2) JEE Main Previous Year Paper (1) (a)-(iv), (b)-(iii), (c)-(ii), (d)-(i) (2) (a)-(ii), (b)-(iv), (c)-(iii), (d)-(i) (3) (a)-(i), (b)-(iii), (c)-(iv), (d)-(ii) (4) (a)-(iv), (b)-(iii), (c)-(i), (d)-(ii)

Q50.Which one of the following statements is not true about enzymes? (1) Enzymes are non-specific for a reaction and substrate. (2) Almost all enzymes are proteins. (3) Enzymes work as catalysts by lowering the activation energy of a biochemical reaction. (4) The action of enzymes is temperature and pH specific JEE Main 2021 (20 Jul Shift 2) JEE Main Previous Year Paper

Q50.Out of following isomeric forms of uracil, which one is present in RNA? (1) (2) (3) (4)

Q50.Which of the following is NOT an example of fibrous protein ? (1) Keratin (2) Albumin (3) Myosin (4) Collagen

Q50.Which one of the following compounds contains β −C1 −C4 glycosidic linkage ? (1) Sucrose (2) Amylose (3) Lactose (4) Maltose

Q50.The polymer formed on heating Novolac with formaldehyde is: (1) Polyester (2) Bakelite (3) Nylon- 6, 6 (4) Melamine

Q50.Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A) : Sucrose is a disaccharide and a non-reducing sugar. Reason (R): Sucrose involves glycosidic linkage between C1 of β -glucose and C2 of α-fructose. Choose the most appropriate answer from the options given below : (1) Both (A) and (R) are true and (R) is the true explanation of (A). (2) (A) is true but (R) is false. (3) (A) is false but (R) is true. (4) Both (A) and (R) are true but (R) is not the true explanation of (A). Q51. 100 mL of Na3 PO4 solution contains 3. 45 g of sodium. The molarity of the solution is ..... ×10−2 mol L−1 . (Nearest integer) [Atomic Masses - Na : 23. 0u, O : 16. 0u, P : 31. 0u]

Q50.Which one of the following is correct structure for cytosine ? JEE Main 2021 (25 Jul Shift 2) JEE Main Previous Year Paper (1) (2) (3) (4)

Q50.Monomer units of Dacron polymer are : (1) glycerol and phthalic acid (2) ethylene glycol and phthalic acid (3) ethylene glycol and terephthalic acid (4) glycerol and terephthalic acid

Q50.Thiamine and pyridoxine are also known respectively as: (1) Vitamin B2 and Vitamin E (2) Vitamin E and Vitamin B2 (3) Vitamin B6 and Vitamin B2 (4) Vitamin B1 and Vitamin B6

Q50. The compound ′A′ is a complementary base of .......... in DNA strands. JEE Main 2021 (27 Jul Shift 1) JEE Main Previous Year Paper (1) Uracil (2) Guanine (3) Adenine (4) Cytosine

Q50.Deficiency of vitamin K causes : (1) Increase in blood clotting time (2) Increase in fragility of RBC 's (3) Cheilosis (4) Decrease in blood clotting time

Q50. In the above reactions, the enzyme A and enzyme B respectively are :- (1) Amylase and Invertase (2) Invertase and Amylase (3) Invertase and Zymase (4) Zymase and Invertase

Q50.Hydrolysis of sucrose gives: JEE Main 2021 (27 Aug Shift 2) JEE Main Previous Year Paper (1) α −D −(+)− Glucose and α −D −(−)- (2) α −D −(+)− Glucose and β −D −(−)− Fructose Fructose (3) α −D −(−)-Glucose and β −D −(−)- (4) α −D −(−) −Glucose and α −D −(+)- Fructose Fructose Q51. 100 g of propane is completely reacted with 1000 g of oxygen. The mole fraction of carbon dioxide in the resulting mixture is x × 10−2 . The value of x is (Nearest integer)