Tiêu đề 1.Basic Concepts of Chemistry T or F.Q.pdf ✅

CHEMISTRY 16 Jun 2009 __________(Ex. Sheet)________________ Q.1 Molecular mass of a substance is the mass of its one molecule in atomic mass units. [T] Q.2 The mass of carbon present in 36.8g of potassium ferrocyanide (Mol. mass = 368) is 12g. [F] Q.3 A 20% solution of KOH (density = 1.02g/ml) has molarity = 3.64. [T] ______________________________________________ Q.4 Equal volumes of different gases under similar conditions of temperature and pressure contain equal number of atoms. [False] Q.5 1 mole of C12H22O11 contains 22 hydrogen atoms. [False] Q.6 Nitrogen forms five oxides. It proves the law of multiple proportions. [True] Q.7 Empirical formula = (Molecular formula) × n [False] Q.8 Mass of 3.01 × 1023 molecules of methane is 8 gm. [True] Q.9 Avogadro’s number varies with temperature and pressure. [False] Q.10 18 gm of water vapour and 18 gm of ice will not contain the same number of molecules. [False]