Practice Questions

Q39.The relative stability of +1 oxidation state of group 13 elements follows the order (1) Al < Ga < Tl < In (2) T1 < In < Ga < Al (3) Ga < Al < ln < Tl (4) Al < Ga < In < Tl

Q40.The layer of atmosphere between 10 km to 50 km above the sea level is called as: (1) stratosphere (2) troposphere (3) mesosphere (4) thermosphere

Q40.The number of pentagons in C60 and trigons (triangles) in white phosphorus, are; (1) 12 and 3 (2) 20 and 4 (3) 20 and 3 (4) 12 and 4

Q40.The electronegativity of aluminum is similar to: (1) Beryllium (2) Boron (3) Carbon (4) Lithium

Q40.Correct statements among regarding silicones are: ( 𝑎) They are polymers with hydrophobic character. ( 𝑏) They are biocompatible. ( 𝑐) In general, they have high thermal stability and low dielectric strength. ( 𝑑) Usually, they are resistant to oxidation and used as greases. (1) ( 𝑎) , ( 𝑏) and ( 𝑐) only (2) ( 𝑎) and ( 𝑏) only (3) ( 𝑎) , ( 𝑏) , ( 𝑐) and ( 𝑑) (4) ( 𝑎) , ( 𝑏) and ( 𝑑) only

Q41.The basic structural unit of feldspar, zeolites mica, and asbestos is: (1) SiO4 4 - (2) (3) SiO3 2 - (4) SiO2 JEE Main 2019 (12 Apr Shift 1) JEE Main Previous Year Paper

Q42.The major product of the f following reaction is: JEE Main 2019 (08 Apr Shift 1) JEE Main Previous Year Paper (1) (2) (3) (4)

Q42.A solution of Ni(NO3)2 is electrolyzed between platinum electrode 0.1 Faraday electricity. How many mole of Ni will be deposited at the cathode? (1) 0.10 (2) 0.15 (3) 0.05 (4) 0.20

Q42.The amount of sugar (C12H22O11) required to prepare 2L of its 0 .1 M aqueous solution is: (1) 17 .1 g (2) 136 .8 g (3) 68 .4 g (4) 34 .2 g

Q42.If Dichloromethane (DCM) and water H2O are used for differential extraction, which one of the following statements is correct? (1) DCM and H2O would stay as upper and lower (2) DCM and H2O will be miscible clearly layer respectively in the separating funnel (S.F.) (3) DCM and H2O would stay as lower and upper (4) DCM and H2O will make turbid/colloidal layer respectively in the S.F mixture JEE Main 2019 (10 Jan Shift 1) JEE Main Previous Year Paper

Q43.Peroxyacetyl nitrate (PAN), an eye irritant, is produced by: (1) Classical smog (2) Acid rain (3) Organic waste (4) Photochemical smog

Q43.The major product of the following reaction is: (1) (2) (3) (4)

Q43.The elevation in boiling point for 1 molal solution of glucose is 2 K. The depression in freezing point for 2 molal solution of glucose in the same solvent is 2 K. The relation between Kb and Kf is: (1) Kb = 2 Kf (2) Kb = 1 .5 Kf (3) Kb = Kf (4) Kb = 0 .5 Kf

Q43.Excessive release of CO2 into the atmosphere results in (1) global warming. (2) polar vortex. (3) depletion of ozone. (4) formation of smog.

Q44.The concentration of dissolved oxygen (DO) in cold water can go upto (1) 14ppm (2) 8 ppm (3) 10ppm (4) 16pom

Q45.Consider the following reversible chemical reactions: k1 A2(g) + B2(g) ⇌2AB(g) .....(1) k2 6AB(g) ⇌3A2(g) + 3B2(g) .....(2) The relation between K1 and K2 is: (1) K2 = K 1−3 (2) K1K2 = 31 (3) K2 = K 13 (4) K1K2 = 3

Q45.The one that is not a carbonate are is: (1) malachite (2) bauxite (3) calamine (4) siderite

Q45.The ratio of number of atoms present in a simple cubic, body centered cubic and face centered cubic structure are, respectively : (1) 4 : 2 : 1 (2) 1 : 2 : 4 (3) 4 : 2 : 3 (4) 8 : 1 : 6

Q45.The molecule that has minimum or no role in the formation of photochemical smog, is: (1) N2 (2) O3 (3) H2C = O (4) NO

Q45.For an elementary chemical reaction, A2 k1 ⇄ 2A , the expression for d[A]dt is: k−1 (1) 2k1[A2] −2k−1[A]2 (2) 2k1[A2] −k−1[A]2 (3) k1[A2] + k−1[A]2 (4) k1[A2] −k−1[A]2

Q45.Water filled in two glasses A and B gave BOD values of 10 and 20, respectively. The correct statement regarding them is (1) A is suitable for drinking, whereas B is not (2) B is more polluted than A (3) Both A and B are suitable for drinking (4) A is more polluted than B

Q46.The standard Gibbs energy for the given cell reaction in kJ mol−1 at 298 K is: Zn(s) + Cu2+(aq) ⟶Zn2+(aq) + Cu(s) , E0 = 2 V at 298 K (Faraday's constant , F = 96000 C mol−1) (1) −192 (2) 192 (3) 384 (4) −384

Q46.The correct set of species responsible for the photochemical smog is: (1) CO2, NO2, SO2 and hydrocarbons (2) NO2, O2, O3 and hydrocarbons (3) NO2, NO2 and hydrocarbons (4) NO, NO2, O3 and hydrocarbons

Q46.The haemoglobin and the gold sol are examples of (1) positively charged sols, (2) negatively and positively charged sols, respectively. (3) negatively charged sols. (4) positively and negatively charged sols, respectively.

Q46.The noble gas that does not occur in the atmosphere is; (1) Kr (2) Ne (3) Ra (4) He Q47.1 g of a non-volatile non-electrolyte solute is dissolved in 100 g of two different solvents A and B whose ∆TbA ebullioscopic constants are in the ratio of 1: 5. The ratio of the elevation in their boiling points, ∆TbB, is: (assuming they have the same molar mass) (1) 10: 1 (2) 1: 5 (3) 1: 0.2 (4) 5: 1