Скачать или смотреть Some Basic Concepts of Chemistry - JEE Main 2018 - Online & Offline Paper Solutions by Rohit Dahiya

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JEE Main Solutions –Some Basic Concepts of Chemistry – 2018 (Online and Offline Papers)

JEE Main 2013-2017 Solutions are available on the COACHENGG APP

Q20 (JEE Main 2018 Offline): The ratio of mass percent of C and H of an organic compound (CXHYOZ) is 6:1. If one molecule of the above compound (CXHYOZ) contains half as much oxygen as required to burn one molecule of compound CXHY completely to CO2 and H2O.The empirical formula of compound CXHYOZ is :
(1) C3H4O2 (2) C2H4O3 (3) C3H6O3 (4) C2H4O


Q21 (JEE Main 2018 Online 1): A sample of NaClO3 is converted by heat to NaCl with a loss of 0.16 g of oxygen. The residue is dissolved in water and precipitated as AgCl. The mass of AgCl (in g) obtained will be : (Given: Molar mass of AgCl = 143.5 g mol–1)
(1) 0.35 (2) 0.54 (3) 0.41 (4) 0.48

Q22 (JEE Main 2018 Online 2): For per gram of reactant, the maximum quantity of N2 gas is produced in which of the following thermal decomposition reactions ?
(Given : Atomic weight - Cr=52 u, Ba=137 u)
(1) (NH4)2Cr2O7 (s) → N2 (g) + 4H2O (g) + Cr2O3 (s) (2) 2NH4NO3 (s) → 2N2(g) + 4H2O(g) + O2(g)
(3) Ba(N3)2 (s) → Ba(s) + 3N2 (g)
(4) 2NH3 (g) → N2(g) + 3H2 (g)

Q23 (JEE Main 2018 Online 3): An unknown chlorohydrocarbon has 3.55 % of chlorine. If each molecule of the hydrocarbon has one chlorine atom only ; chlorine atoms present in 1 g of chlorohydrocarbon are : (Atomic wt. of Cl = 35.5 u ; Avogadro constant = 6.023 × 1023 mol–1)
(1) 6.023 × 109 (2) 6.023 × 1023 (3) 6.023 × 1021 (4) 6.023 × 1020

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