Chemistry Quiz for Class 9
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Questions and Answers

Which of the following is a correct statement about isotopes?

  • Isotopes have different numbers of protons
  • Isotopes have the same number of protons and electrons
  • Isotopes have the same atomic mass
  • Isotopes have the same number of neutrons (correct)

    • What is the formula for calculating the number of moles of a substance?

  • n = m/V (correct)
  • n = N/A
  • n = Q/t
  • n = PV/RT

    • What is the difference between an exothermic and endothermic reaction?

  • Endothermic reactions release energy to the surroundings
  • Exothermic reactions release energy to the surroundings
  • Endothermic reactions absorb energy from the surroundings (correct)
  • Exothermic reactions absorb energy from the surroundings

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