Practice Questions

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.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)

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.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).

Q51.The value of magnetic quantum number of the outermost electron of Zn+ ion is _________ . (Integer answer) JEE Main 2021 (31 Aug Shift 2) JEE Main Previous Year Paper

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

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

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

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]

Q52.For water Δvap H = 41 kJ mol−1 at 373 K and 1 bar pressure. Assuming that water vapour is an ideal gas that occupies a much larger volume than liquid water, the internal energy change during evaporation of water is (kJmol−1) : [ Use : R = 8. 3 J mol−1 K−1]

Q52.A proton and a Li3 + nucleus are accelerated by the same potential. If 𝜆Li and 𝜆p denote the de Broglie + 𝜆Li wavelengths of Li3 and proton respectively, then the value of is 𝑥× 10-1. The value of x 𝜆p is _____ (Rounded off to the nearest integer) [Mass of Li3 + = 8 . 3 mass of proton]

Q52.Number of electrons that Vanadium (Z = 23) has in p-orbitals is equal to:

Q52.According to the following figure, the magnitude of the enthalpy change of the reaction A + B →M + N in kJ mol−1 is equal to __________ . (Integer answer)

Q52.The number of orbitals with n = 5, m1 = +2 is ________. (Round off to the Nearest Integer).

Q53.If the standard molar enthalpy change for combustion of graphite powder is −2. 48 × 102 kJ mol−1 , the amount of heat generated on combustion of 1 g of graphite powder in kJ (Nearest integer):

Q53.A certain orbital has n = 4 and ml = −3. The number of radial nodes in this orbital is _______. (Round off to the Nearest Integer).

Q53.The spin-only magnetic moment value of B2+ species is × 10-2BM (Nearest integer) [ Given : √3 = 1 . 73]

Q54.Assuming ideal behaviour, the magnitude of log K for the following reaction at 25°C is x × 10−1. The value of x is __________. (Integer answer) 3HC ≡CH(g) ⇌C6H6(l) [Given: ΔfG°(HC ≡CH) = −2. 04 × 105 J mol−1; ΔfG°(C6H6) = −1. 24 × 105 J mol−1; R = 8. 314 J K−1 mol−1 ]

Q54.At 298 K, the enthalpy of fusion of a solid X is 2 . 8 kJ mol-1 and the enthalpy of vaporisation of the liquid X is 98 . 2 kJ mol-1. The enthalpy of sublimation of the substance X in kJ mol-1 is ______. (in nearest integer)

Q54.Among the following, number of metal/s which can be used as electrodes in the photoelectric cell is ___ . (Integer answer) JEE Main 2021 (25 Feb Shift 2) JEE Main Previous Year Paper (A) Li (B) Na (C) Rb (D) Cs

Q54.A system does 200 J of work and at the same time absorbs 150 J of heat. The magnitude of the change in internal energy is ______ J. (Nearest integer)

Q55.Dichromate ion is treated with base, the oxidation number of Cr in the product formed is Q56. 224 mL of SO2(g) at 298 K and 1 atm is passed through 100 mL of 0. 1 M NaOH solution. The non-volatile solute produced is dissolved in 36 g of water. The lowering of vapour pressure of solution (assuming the solution is dilute) ( P°(H2O)= 24 mm of Hg ) is x × 10−2 mm of Hg the value of x is (Integer answer)

Q55.The molarity of the solution prepared by dissolving 6. 3 g of oxalic acid (H2C2O4 ⋅2H2O) in 250 mL of water in mol L−1 is x × 10−2. The value of x is _________ . (Nearest integer) [Atomic mass : H : 1. 0, C : 12. 0, 0 : 16. 0 J]

Q55.For the reaction 2NO2 ( 𝑔) ⇌N2O4 ( g ) , when ΔS = - 176 . 0 J K-1 and ΔH = - 57 . 8 kJ mol-1 the magnitude of ΔG at 298 K for the reaction is _____ kJmol-1. (Nearest integer)