Chemistry (Objective) (Pages :45)

  • 121 Different forms of the same element with different physical appearances are known as?

    Ans : Allotropes Eg: Diamond; Graphite and Charcoal are the allotropes of Carbon
  • 122 The allotrope of Oxygen?

    Ans : Ozone
  • 123 An arrangement of elements with similar properties placed together is called?

    Ans : Periodic Table
  • 124 Mendeleev's periodic table was based on?

    Ans : increasing order of atomic mass
  • 125 Moseley's periodic table was based on the?

    Ans : atomic number of elements
  • 126 The modern periodic table is based on?

    Ans : atomic number
  • 127 Modern periodic table contains?

    Ans : 7 horizontal rows and 18 vertical columns
  • 128 The periodic table was discovered by?

    Ans : Dmitri Ivanovich Mendeleev
  • 129 Modern periodic table was discovered by?

    Ans : Henry Moseley
  • 130 Periodic laws were put forward by?

    Ans : Mendeleev
  • 131 Modern periodic laws were put forward by?

    Ans : Moseley
  • 132 The scientist who classified elements based on Atomic Values is?

    Ans : Lothar Meyer
  • 133 The rows in periodic table are called?

    Ans : Periods
  • 134 Columns are periodic table called?

    Ans : Groups
  • 135 The left side of the periodic table denotes?

    Ans : Metals
  • 136 The right side of the periodic table denotes?

    Ans : Non-metals
  • 137 Most abundant element on earth's crust?

    Ans : Oxygen
  • 138 Most abundant metal in earth's crust?

    Ans : Aluminium
  • 139 Most abundant metalloid in earth's crust?

    Ans : Silicon
  • 140 Most abundant element in atmosphere?

    Ans : Nitrogen
  • 141 Most abundant element in the universe?

    Ans : Hydrogen
  • 142 Most abundant element in human body?

    Ans : Oxygen
  • 143 Most abundant gas in atmosphere?

    Ans : Nitrogen
  • 144 Most abundant element in sea water?

    Ans : Chlorine
  • 145 Most abundant element in moon's surface?

    Ans : Titanium
  • 146 Most abundant metal present in human body and bones?

    Ans : Calcium
  • 147 Most abundant metal compound in bones?

    Ans : Calcium phosphate
  • 148 Most abundant compound on earth's surface?

    Ans : Water (H20)
  • 149 Most abundant compound in sea water?

    Ans : Sodium Chloride
  • 150 Second most abundant compound in sea water?

    Ans : Magnesium Chloride

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