9th standard Science Chapter-4 November 30, 2020December 26, 2020wefru9th Standard Science quiz Chapter-4 0 Created on November 30, 2020 By wefru9th Standard Science Chapter 4TEST YOUR SKILLS 1 / 10Q.31Which 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 (i) (i) and (iv) (ii) and (iii) (ii) and (iv) 2 / 10Q.32 Which of the following statements is not true about an atom? Atoms are not able to exist independently. Atoms are the basic units from which molecules and ions are formed. Atoms are always neutral in nature. Atoms aggregate in large numbers to form the matter that we can see, feel or touch. 3 / 10Q.33 1 u or 1 amu means 1/12th mass of C-12 atoms Mass of C-12 atom Mass of O-16 atom Mass of Hydrogen molecule 4 / 10Q.34 Which of the following contains maximum number of molecules? 19 CO2 1 g N2 1 g H2 1 g CH4 5 / 10Q.35 A sample of NH3 molecule irrespective of source contains 82.35% Nitrogen and 17.65% of Hydrogen by mass. This data supports: Law of Conservation of Mass Las of Multiple Proportions Law of Definite Proportions Avogadro’s Law 6 / 10Q.36 An element X is divalent and another element Y is tetravalent. The compound formed by these two elements will be: XY XY2 X2Y XY4 7 / 10Q.37 The molecular formula of potassium nitrate is ________. KNO3 KNO KNO2 KON 8 / 10Q.38 3.42 g of sucrose are dissolved in 18 g of water in a beaker. The numbers of oxygen atoms in the solution are: 6.68 × 1023 6 ×1023 6.68 ×102359866 6.68 ×1023215464 9 / 10Q.39 Molecular mass is defined as the: Mass of one molecule of any substance compared with the mass of one atom of C – 12 Mass of one atom compared with the mass of one atom of hydrogen Mass of one atom compared with the mass of one molecule None of the above 10 / 10Q.40 The atomic mass of sodium is 23. The number of moles in 46g of sodium is ________. 2 3 5 7 Your score isThe average score is 0% LinkedIn Facebook Twitter VKontakte 0% Restart quiz
