Just give answer do not explane

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+