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1- Which of the following chemical formula contains the greatest number of different elements?


  • sodium hydroxide
  • iron(III) chloride
  • tin(II) dichromate
  • ammonium acetate


A double bond forms between two atoms when


  • 2 electron's are shared
  • 3 electrons are shared
  • 4 electrons are shared
  • 1 electron is shared.


2- What is the ratio of elements in the formula? NI3


  • 3N: 1I
  • 3I: 1N
  • 1I: 1N
  • Non of the above


3- Which one of the following is an Ionic compound?


  • P2O5
  • Cl2O7
  • Na2O
  • SO2


4- The atomic number of copper is 29, This means that


  • Copper has 29 electrons
  • Copper has 29 protons
  • Both A and B is correct
  • Non of the above is correct


5- The charge on the Cu in CuO is

  • +1
  • + 2
  • + 1 and +2
  • Non of the above


6- When CaF2 is dissolved in water, The ratio of the ions released are


  • 1 Ca: 2F
  • 2Ca: 2F
  • 1Ca and IF
  • 2Ca: 1F


7- Which one of the following is a covalent compound

  • P2O5
  • NaOH
  • KNO3
  • Non of the above


8 -What is the correct formula for Gallium Arsenide?


  • GaAs2
  • Ga2As3
  • GaAs
  • Ga2As


9 - What is the charge on Hg in the compound HgS


  • 1
  • 2+
  • 2-
  • HgS is a covalent compound, therefore there is no charge.


10 - Which ion has the same number of electrons as an atom of krypton?


  • F-
  • S2-
  • Ca2+
  • Rb+
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Subject: Chemistry, Science
Just give answer do not explane 1- Which of the following chemical formula contains the greatest number of different elements? sodium hydroxide
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