Plzz answer me all three questions

​Q3. Iron displaces copper from a solution of a copper salt. The reaction is deemed as a redox reaction.

Q4. A non-metallic atom [at. no.9] forms a molecule of the same, containing a single covalent bond.

Q5. In the formation of MgO the magnesian atom [at. no.12] loses two electrons from its valence shell.

Dear student,

3)In the reaction, copper ions become copper metal and iron metal from iron(II) ions. Copper ions gain electrons to form a copper atom. These electrons come from the reaction when iron atoms lose electrons to form Fe+2.So, electrons are transferred from iron to copper. Hence it is a redox reaction.The reactions are as follows:
 
4)A non-metallic atom having the atomic number 9 is Fluorine which has a valence electron of 7 in number.Thus, it requires one or more electrons to complete its octet as 8.Hence, Fluorine combines with other atoms of the same element to form a molecule having single covalent nature shown below.
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Kindly post rest of the questions separately.
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