Arihant 43 Previous Years JEE Chemistry Past Paper PDF

1 Some Basic Concepts of Chemistry 6. The percentage composition of carbon by mole in methane is Topic 1 Mole Concept...

1 Some Basic Concepts of Chemistry 6. The percentage composition of carbon by mole in methane is Topic 1 Mole Concept (2019 Main, 8 April II) (a) 75% (b) 20% (c) 25% (d) 80% Objective Questions I (Only one correct option) 7. 8 g of NaOH is dissolved in 18 g of H2 O. Mole fraction of 1. 5 moles of AB2 weight 125 × 10−3 kg and 10 moles of A2 B2 NaOH in solution and molality (in mol kg− 1 ) of the solution weight 300 × 10−3 kg. The molar mass of A ( M A ) and molar respectively are (2019 Main, 12 Jan II) mass of B ( M B ) in kg mol −1 are (2019 Main, 12 April I) (a) 0.2, 11.11 (b) 0.167, 22.20 (a) M A = 10 × 10−3 and M B = 5 × 10−3 (c) 0.2, 22.20 (d) 0.167, 11.11 (b) M A = 50 × 10−3 and M B = 25 × 10−3 8. The volume strength of 1 M H2 O2 is −3 −3 (c) M A = 25 × 10 and M B = 50 × 10 (Molar mass of H2 O2 = 34 g mol −1 ) (2019 Main, 12 Jan II) (d) M A = 5 × 10−3 and M B = 10 × 10−3 (a) 16.8 (b) 22.4 (c) 11.35 (d) 5.6 2. The minimum amount of O2 ( g ) consumed per gram of 9. The amount of sugar (C12 H22 O11 ) required to prepare 2 L of reactant is for the reaction (Given atomic mass : Fe = 56, its 0.1 M aqueous solution is (2019 Main, 10 Jan II) O = 16, Mg = 24, P = 31, C = 12, H = 1) (2019 Main, 10 April II) (a) 17.1 g (b) 68.4 g (c) 136.8 g (d) 34.2 g (a) C3 H8 ( g ) + 5O2 ( g ) → 3CO2 ( g ) + 4H2 O( l ) 10. For the following reaction, the mass of water produced from (b) P4 ( s ) + 5O2 ( g ) → P4 O10 ( s ) 445 g of C57 H110 O6 is : (c) 4Fe( s ) + 3O2 ( g ) → 2Fe2 O3 ( s ) 2C57 H110 O6 ( s ) + 163O2 ( g ) → 114CO2 ( g ) + 110 H2 O ( l ) (d) 2Mg ( s ) + O2 ( g ) → 2MgO( s ) (2019 Main, 9 Jan II) 3. At 300 K and 1 atmospheric pressure, (a) 490 g (b) 495 g (c) 445 g (d) 890 g 10 mL of a hydrocarbon required 55 mL of O2 for complete 11. A solution of sodium sulphate contains 92 g of Na + ions per combustion and 40 mL of CO2 is formed. The formula of the kilogram of water. The molality of Na + ions in that solution hydrocarbon is (2019 Main, 10 April I) in mol kg−1 is (2019 Main, 9 Jan I) (a) C4H7Cl (b) C4H 6 (c) C4H10 (d) C4H 8 (a) 16 (b) 4 (c) 132 (d) 8 4. 10 mL of 1 mM surfactant solution forms a monolayer 12. The most abundant elements by mass in the body of a healthy covering 0.24 cm 2 on a polar substrate. If the polar head is human adult are oxygen (61.4%), carbon (22.9%), hydrogen approximated as a cube, what is its edge length? (10.0 %), and nitrogen (2.6%). The weight which a 75 kg (2019 Main, 9 April II) person would gain if all 1 Hatoms are replaced by 2 Hatoms is (a) 2.0 pm (b) 0.1 nm (c) 1.0 pm (d) 2.0 nm (2017 JEE Main) 5. For a reaction, (a) 15 kg (b) 37.5 kg N 2 ( g ) + 3H 2 ( g ) → 2NH 3 ( g ), identify dihydrogen (H 2 ) (c) 7.5 kg (d) 10 kg as a limiting reagent in the following reaction mixtures. 13. 1 g of a carbonate (M 2 CO3 ) on treatment with excess HCl (2019 Main, 9 April I) produces 0.01186 mole of CO2. The molar mass of M 2 CO3 (a) 56 g of N 2 + 10 g of H 2 (b) 35 g of N 2 + 8 g of H 2 in g mol −1 is (2017 JEE Main) (c) 14 g of N 2 + 4 g of H 2 (d) 28 g of N 2 + 6 g of H 2 (a) 1186 (b) 84.3 (c) 118.6 (d) 11.86