Chemistry (Objective) (Pages :45)

  • 61 Nucleus(+ve charge)was discovered by?

    Ans : Ernest Rutherford
  • 62 Positron (+ve charge) was discovered by?

    Ans : Carl Anderson
  • 63 Antineutron (No charge) was discovered by?

    Ans : Bruce Cork
  • 64 The combining capacity of one atom to another?

    Ans : Valency
  • 65 Atom is bigger than its nucleus?

    Ans : 105 times
  • 66 Electrons move in a circular path called?

    Ans : Orbit
  • 67 The maximum number of elements in an orbit is?

    Ans : 2
  • 68 The orbit followed by a moving electrons around the nucleus of an atom?

    Ans : Shell
  • 69 The maximum number of electrons in a shell?

    Ans : 2n^2 (n = Number of shell)
  • 70 Smallest particle of a substance having all its properties?

    Ans : Molecule
  • 71 The number of molecules obtained in mole of gas is called 1?

    Ans : Avogadro Number
  • 72 Avagadro Number is?

    Ans : 6.023 x 10^23
  • 73 The term molecule was coined by?

    Ans : Avogadro
  • 74 International mole day is on?

    Ans : October 23
  • 75 What is known as the bricks of Universe?

    Ans : Molecules
  • 76 The SI Unit of the amount of substance?

    Ans : Mole
  • 77 A molecule made up of only\one kind of atom is called?

    Ans : Monoatomic molecule
  • 78 A molecule made up of two kinds of atom is called?

    Ans : Diatomic molecule
  • 79 Substance which is composed of similar I' kind of atoms is called?

    Ans : Elements
  • 80 The scientist who proved that the elements are made up of atoms?

    Ans : John Dalton
  • 81 The term 'elements' was coined by?

    Ans : Robert Boyle
  • 82 The first scientist who gave a definition to element is?

    Ans : Robert Boyle
  • 83 The scientist who gave symbols for elements on the basis of their names?

    Ans : John .J. Berzelius
  • 84 The scientist who classified elements into Metals and Non-metals is?

    Ans : Lavoisier
  • 85 Elements are classified into?

    Ans : Metals; non-metals and metalloids
  • 86 Elements that conduct electricity and heat which tends to lose electrons are called?

    Ans : Metals
  • 87 Elements that do not conduct electricity and heat which tends to accept electrons?

    Ans : Non-Metals
  • 88 Elements showing properties of both metals and non-metals are?

    Ans : Metalloids
  • 89 The international association which gives names of elements?

    Ans : International Union of Pure and Applied Chemistry (IUPAC)
  • 90 The headquarters of IUPAC?

    Ans : Zurich (Switzerland)

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