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ROY’S ONLINE CLASSES, (Conceptual Teaching), MCQ – 1/ Chemistry / Atoms and Molecules, , Q1, , Q2, , Q3, , Q4, , Q5, , Q6, , Q7, , Q8, , (Class IX), , Test Paper – MCQ – 1, (Atoms and Molecules), Which of the following correctly represents 360g of water?, (i) 2 moles of water, (ii) 20 moles of water, (iii) 6.022 × 1023 molecules of water, (iv) 1.2044 × 1025 molecules of water, (a) (i), (b) (i) and (iv), (c) (ii) and (iii), (d) (ii) and (iv), Which of the following statements is not true about an atom?, (a) Atoms are not able to exist independently., (b) Atoms are the basic units from which molecules and ions are, formed., (c) Atoms are always neutral in nature., (d) Atoms aggregate in large numbers to form the matter that we can see, feel or touch., 1 u or 1 amu means, (a) 1/12th mass of C-12 atoms, (b) Mass of C-12 atom, (c) Mass of O-16 atom, (d) Mass of Hydrogen molecule, Which of the following contains maximum number of molecules?, (a) 19 CO2, (b) 1 g N2, (c) 1 g H2, (d) 1 g CH4, A sample of NH3 molecule irrespective of source contains 82.35% Nitrogen and 17.65% of, Hydrogen by mass. This data supports:, (a) Law of Conservation of Mass, (b) Las of Multiple Proportions, (c) Law of Definite Proportions, (d) Avogadro’s Law, An element X is divalent and another element Y is tetravalent. The compound formed by, these two elements will be:, (a) XY, (b) XY2, (c) X2Y, (d) XY4, The molecular formula of potassium nitrate is ________., (a) KNO3, (b) KNO, (c) KNO2, (d) KON, 3.42 g of sucrose are dissolved in 18 g of water in a beaker. The numbers of oxygen atoms in, the solution are:, (a) 6.68 ×1023, (b) 6.09 ×1022, , Roy Sir 9650789723
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ROY’S ONLINE CLASSES, (Conceptual Teaching), MCQ – 1/ Chemistry / Atoms and Molecules, , Q9, , Q 10, , Q 11, , Q 12, , Q 13, , Q 14, , Q 15, , Q 16, , Q 17, , Q 18, , (Class IX), , (c) 6.022 ×1023, (d) 6.022 ×1021, Molecular mass is defined as the:, (a) Mass of one molecule of any substance compared with the mass of one atom of C – 12, (b) Mass of one atom compared with the mass of one atom of hydrogen, (c) Mass of one atom compared with the mass of one molecule, (d) None of the above, A change in the physical state can be brought about, (a) only when energy is given to the system, (b) only when energy is taken out from the system, (c) When energy is either given to, or taken out from the system, (d) Without any energy change, The atomic mass of sodium is 23. The number of moles in 46g of sodium is ________., (a) 4, (b) 2, (c) 0, (d) ½, Which of the following represents a correct chemical formula?, (a) CaCl, (b) BiPO4, (c) NaSO4, (d) NaS, What is the formula mass unit of ZnO?, (a) 18 u, (b) 81 u, (c) 88 u, (d) 188 u, How many atoms of oxygen are present in 300 grams of CaCO3?, (a) 54.207 × 1023, (b) 6.207 × 1023, (c) 12.207 × 1023, (d) 22.2 × 1023, Which of the following represents the correct relation between Avogadro’s number (No),, number of particles (N) and moles (n)?, (a) (a) n = N / No, (b) n = No / N, (c) n = N No, (d) all are correct, The atomicities of ozone, sulphur, phosphorus and argon are respectively :, (a) 8, 3, 4 and 1, (b) 1, 3, 4 and 8, (c) 4, 1, 8 and 3, (d) 3, 8, 4 and 1, The symbol of a metal element which is used in making thermometers is :, (a) Ag, (b) Hg, (c) Mg, (d) Sg, The Latin language name of an element is natrium. The English name of this element is :, , Roy Sir 9650789723
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ROY’S ONLINE CLASSES, (Conceptual Teaching), MCQ – 1/ Chemistry / Atoms and Molecules, , Q 19, , Q 20, , Q 21, , Q 22, , Q 23, , Q 24, , Q 25, , (Class IX), , (a) sodium, (b) potassium, (c) magnesium, (d) sulphur, The atomic theory of matter was proposed by :, (a) John Kennedy, (b) Lavoisier, (c) Proust, (d) John Dalton, One of the following elements has an atomicity of ‘one’. This element is :, (a) helium, (b) hydrogen, (c) sulphur, (d) ozone, The English name of an element is potassium, its Latin name will be :, (a) plumbum, (b) cuprum, (c) kalium, (d) natrium, The law of conservation of mass was given by :, (a) Dalton, (b) Proust, (c) Lavoisier, (d) Berzelius, The element having atomicity ‘four’ is most likely to be :, (a) argon, (b) fluorine, (c) phosphorus, (d) francium, If 1.4 g of calcium oxide is formed by the complete decomposition of calcium carbonate, then, the amount of calcium carbonate taken and the amount of carbon dioxide formed will be, respectively :, (a) 2.2 g and 1.1 g, (b) 1.1 g and 2.5 g, (c) 2.5 g and 1.1 g, (d) 5.0 g and 1.1 g, The law of constant proportions was given by :, (a) Proust, (b) Lavoisier, (c) Dalton, (d) Berzelius, , Roy Sir 9650789723
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ROY’S ONLINE CLASSES, (Conceptual Teaching), MCQ – 1/ Chemistry / Atoms and Molecules, , (Class IX), , Answers - Test Paper – MCQ – 1, (Atoms and Molecules), A1, A2, A3, A4, A5, A6, A7, A8, A9, A10, A11, A12, A13, A14, A15, A16, A17, A18, A19, A20, A21, A22, A23, A24, A25, , (d) (ii) and (iv, (d) Atoms aggregate in large numbers to form the matter that we can see, feel or touch., (a) 1/12th mass of C-12 atoms, (c) 1 g H2, (c) Law of Definite Proportions, (b) XY2, (a) KNO3, (a) 6.68 × 1023, (a) Mass of one molecule of any substance compared with the mass of one atom of C – 12, (c) When energy is either given to, or taken out from the system, (c) When energy is either given to, or taken out from the system, (b) BiPO4, (b) 81 u, (a) 54.207 × 1023, (a) n = N / No, (d), (b), (a), (d), (a), (c), (c), (c), (c), (a), , Roy Sir 9650789723
