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(Atomic weight of Mg = 24), What is the mass of precipitate formed when 50 mL of 16.9% solution of AgNO3 is mixed, (Ag = 107.8, N = 14, O = 16, Na= 23,Cl=35.5), The number of water molecules is maximum in, 25.3 g of Sodium carbonate Na2CO3 is dissolved in enough water to make 250 mL of. Brass can have any proportion of Cu and Zn. JEE Mains aspirants may download it for free, and make a self-assessment by solving the JEE Main Some Basic Concepts in Chemistry Important Questions Chemistry . The intend of this article is to share the best suggestions and guidelines to utilize the extra 15 minutes provided for reading the question paper in CBSE Board Examination. If sodium carbonate dissociates completely, molar concentration of sodium ion, Na+ and carbonate ion CO32- are respectively (Molar mass of Na2CO3 = 106 g mol-1), The number of atoms in 0.1 mole of a triatomic gas is (NA=6.02 x1023mol-1), What is the [OH-] in the final solution prepared by mixing 20.0 mL of 0.050 M HCl with, 10 g of hydrogen and 64g of oxygen were filled in a steel vessel and exploded. (a) 2.16g (b) 2.48 g (c) 2.32 g (d) 2.64 g, (a) 1 : 4 (b) 1 : 8 (c) 7 : 32 (d) 3 : 16, (a) 14.8mL (b) 79.6mL (c) 64.8mL (d) 50mL, (a) benzene and ethyne (b) But - 2 - ene and Cyclobutane, (c) glucose and fructose (d) phenol and ethanol. Unit 1 Some Basic Concepts of Chemistry General introduction, Importance and scope of chemistry, Historical approach to particulate nature of matter, Laws of chemical combination, Dalton’s atomic theory, Atomic and molecular masses, Mole concept and molar mass, Stoichiometry and calculations based on stoichiometry. Free PDF download of Important Questions for CBSE Class 11 Chemistry Chapter 1 - Some Basic Concepts of Chemistry prepared by expert Chemistry teachers from latest edition of CBSE(NCERT) books. R : An atom of sodium is 23 times heavier than an atom of. Physicswallah Typed Notes. of molecules in Q is less than that in P. (c) No. (b) Greenhouse effect is responsible for global warming. Assignment. 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