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2. The following statements are true about exothermic reactions except

  • the energy content of the products is lower than that of the reactants.
  • the reaction release heat to the surrounding
  • the formation of bond releases more energy than is required in the bond breaking
  • the formation of bond releases less energy than is required in the bond breaking

3. Which of the following salt is soluble in water?

  • Sodium carbonate
  • Silver chloride
  • Barium sulphate
  • Lead(II) iodide

4. The relative atomic mass of an element is defined as the number of times one atom of the element is heavier than 1/12 of the mass of an atom of isotope Q. What is isotope Q ?

  • Hydrogen-1
  • Carbon-12
  • Oxygen-16
  • Helium-4

5. Which of the following substance conducts electricity in molten state?

  • Naphthalene
  • Magnesium oxide
  • Tetrachloromethane
  • Sulphur
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