9th standard Science Chapter-5 November 30, 2020December 26, 2020wefru 9th Standard Science quiz Chapter-5 0 Created on November 30, 2020 By wefru 9th standard science Chapter 5 TEST YOUR SKILLS 1 / 10 Q.41 Which of the following represents a correct chemical formula? CaCl BiPO4 NaSO4 NaS 2 / 10 Q.42 What is the formula mass unit of ZnO? 81 u 87 u 83 u 811 u 3 / 10 Q.43 How many atoms of oxygen are present in 300 grams of CaCO3? 54.207 × 1023 6.207 × 1023 6.207 × 1 6.20 4 / 10 Q.44 Which of the following represents the correct relation between Avogadro's number (No), number of particles (N) and moles (n)? n = N / No n = No / N n = N No all are correct 5 / 10 Q.45 Who discovered the electron? Rutherford Chadwick Thomson Goldstein 6 / 10 Q.46 Which isotope is used in the nuclear power plants to generate electricity? Uranium 235 Iodine 131 Cobalt 60 Uranium 238 7 / 10 Q.47Why was the Thomson’s Model of an atom failed?i. It could not explain the screening of negative charges from that of positiveii. It did not tell about the presence of electronsiii. It did not give an idea about the discrete energy levelsiv. It explained the atom as a whole to be electrically neutralChoose the correct option from the following: Only (iii) Both (i) & (iii) Only (i) Both (ii) & (iv) 8 / 10 Q.48 What was the source of alpha particles in Rutherford scattering experiment? Hydrogen nucleus Argon nucleus Helium nucleus None of these 9 / 10 Q.49 What property of an element determines its chemical behaviour? Size of an element Valency of an element Molar mass of the element None of these 10 / 10 Q.50 Which of the following does not match the characteristics of an Isotope? Isotopes of some elements are radioactive Isotopes are the atoms of different elements Isotopes differ in number of neutrons Isotopes have similar chemical properties Your score is The average score is 0% LinkedIn Facebook Twitter VKontakte 0% Restart quiz