Practice Questions

Q50.Identify the incorrect statement from the following. (1) Amylose is a branched chain polymer of glucose (2) Starch is a polymer of α −D glucose (3) β−Glycosidic linkage makes cellulose polymer (4) Glycogen is called as animal starch

Q50.Which of the following is correct structure of tyrosine? JEE Main 2021 (17 Mar Shift 1) JEE Main Previous Year Paper (1) (2) (3) (4)

Q50.Which of the glycosidic linkage between galactose and glucose is present in lactose? (1) C −1 of glucose and C −4 of galactose (2) C −1 of glucose and C −6 of galactose (3) C −1 of galactose and C −4 of glucose (4) C −1 of galactose and C −6 of glucose

Q50.Out of the following, which type of interaction is responsible for the stabilisation of 𝛼- helix structure of proteins? (1) Covalent bonding (2) Ionic bonding (3) Hydrogen bonding (4) vander Waals forces Q51.4 . 5 g of compound AM . W . = 90 was used to make 250 mL of its aqueous solution. The molarity of the solution in M is x × 10-1 . The value of x is_____ (Rounded off to the nearest integer)

Q50.The secondary structure of protein is stabilised by: (1) Peptide bond (2) glycosidic bond (3) Hydrogen bonding (4) van der Waals forces

Q50.Seliwanoff test and Xanthoproteic test are used for the identification of _ and _ respectively. (1) aldoses, ketoses (2) ketoses, proteins (3) proteins, ketoses (4) ketoses, aldoses

Q50.Which of the following is correct structure of α-anomer of maltose? JEE Main 2021 (25 Feb Shift 2) JEE Main Previous Year Paper (1) (2) (3) (4)

Q50.Compound A gives D-Galactose and D-Glucose on hydrolysis. The compound A is : (1) Amylose (2) Sucrose (3) Maltose (4) Lactose Q51. 2 SO2( g) + O2( g) →2 SO3( g) JEE Main 2021 (27 Jul Shift 2) JEE Main Previous Year Paper The above reaction is carried out in a vessel starting with partial pressure PSO2 = 250 m bar, PO2 = 750 m bar and PSO3 = 0 bar . When the reaction is complete, the total pressure in the reaction vessel is _____ m bar . (Round off of the nearest integer).

Q50.Which among the following pairs of Vitamins is stored in our body relatively for longer duration? (1) Thiamine and Vitamin A (2) Vitamin A and D (3) Thiamine and Ascorbic acid (4) Ascorbic acid and Vitamin D

Q51.The number of significant figures in 0. 00340 is _________

Q51.Consider the complete combustion of butane, the amount of butane utilized to produce 72 . 0 g of water is ______ × 10-1 g. (in nearest integer) JEE Main 2021 (25 Jul Shift 1) JEE Main Previous Year Paper

Q51.The number of atoms in 8 g of sodium is 𝑥× 1023 . The value of 𝑥 is _____ . (Nearest integer) Given : NA = 6 . 02 × 1023 mol-1 Atomic mass of Na = 23 . 0u]

Q51. In the above reaction, 3. 9 g of benzene on nitration gives 4. 92 g of nitrobenzene. The percentage yield of nitrobenzene in the above reaction is _________ %. (Round off to the Nearest Integer). (Given atomic mass : C : 12. 0 u, H : 1. 0 u O : 16. 0 u, N : 14. 0 u )

Q51.The formula of a gaseous hydrocarbon which requires 6 times of its own volume of O2 for complete oxidation and produces 4 times its own volume of CO2 is CxHy. The value of y is ________. Q52. 1. 86 g of aniline completely reacts to form acetanilide. 10% of the product is lost during purification. Amount of acetanilide obtained after purification (in g) is ___________ ×10−2.

Q51.Methylation of 10 g of benzene gave 9. 2 g of toluene. Calculate the percentage yield of toluene (Nearest integer)

Q51. Consider the above reaction. The percentage yield of amide product is (Round off to the Nearest Integer). (Given : Atomic mass : C : 12. 0u, H : 1. 0u N : 14. 0u, O : 16. 0u, Cl : 35. 5u)

Q51.An aqueous KCl solution of density 1. 20 g mL−1 has a molality of 3. 30 mol kg−1 . The molarity of the solution in molL−1 is____.(The Nearest integer) [ Molar mass of KCl = 74. 5 g]

Q51.The wavelength of electrons accelerated from rest through a potential difference of 40 kV is X × 10−12 m. The value of x is. (Nearest integer) Given: Mass of electron = 9. 1 × 10−31 kg Charge on an electron = 1. 6 × 10−19C Planck's constant = 6. 63 × 10−34 Js

Q51.The Azimuthal quantum number for the valence electrons of Ga+ ion is (Atomic number of Ga = 31)

Q51.The density of NaOH solution is 1. 2 g cm−3. The molality of this solution is m (Round off to the Nearest Integer): [Use : Atomic masses : Na : 23. 0u O : 16. 0u H : 1. 0u Density of H2O : 1. 0 g cm−3]

Q51.The reaction that occurs in a breath analyser, a device used to determine the alcohol level in a person's blood stream is 2 K2 Cr2 O7 + 8H2 SO4 + 3C2H6O →2 Cr2 (SO4)3 + 3C2H4O2 + 2 K2 SO4 + 11H2O If the rate of appearance of Cr2 (SO4)3 is 2. 67 mol min−1 at a particular time, the rate of disappearance of C2H6O at the same time is mol min−1. (Nearest integer) Q52. 1 kg of 0. 75 molal aqueous solution of sucrose can be cooled up to −4°C before freezing. The amount of ice (in g ) that will be separated out is ___________. (Nearest integer) [Given : Kf(H2O) = 1. 86 K kg mol−1 ]

Q51.The number of significant figures in 50000. 020 × 10−3 is

Q51.When 35 mL of 0. 15 M lead nitrate solution is mixed with 20 mL of 0. 12 M chromic sulphate solution, ____________ ×10−5 moles of lead sulphate precipitate out. (Round off to the Nearest Integer).

Q51.The NaNO3 weighed out to make 50 mL of an aqueous solution containing 70. 0 mg Na+ per mL is_ g . (Rounded off to the nearest integer) [Given : Atomic weight in gmol−1 −Na : 23; N : 14; O : 16 ]

Q51. Ge (Z = 32) in its ground state electronic configuration has x completely filled orbitals with ml = 0. The value of x is __________ .