First of all
Fe is Iron, and a sample of Iron would just be pure Iron thus there wouldn't be any "bonds"
Second of all
Fe is a metal thus cannot have a covalent bond. If it bonds, it is usually an ionic bond with non-metal i.e. Oxygen to make rust
FeCO3 contains both ionic and covalent bonds. The Fe-C bond is mainly covalent, as both atoms share electrons, while the Fe-O bond is ionic, as Fe donates electrons to O to form a bond.
No such molecule as 'FeOH'. It is either Fe(OH)2 or Fe(OH)3 The bond between iron(Fe) and the hydroxide ion (OH) is ionic. However the bond between the O & H in the hydroxide moiety is covalent. Fe(OH)2 = Fe^(2+) + (O-H)^(-) + (O-H)^(-) or shortenede down Fe^(2+) + 2(O-H)^(-)
FeNi is an intermetallic compound with a metallic bond. In this case, the bond between iron (Fe) and nickel (Ni) is considered metallic rather than ionic or covalent.
No they have a covalent bond due to because of their electronegativities.
The type of bond in which two atoms share electrons is called a covalent bond.
covalent bond,coordinate bond and singlet bond
Assuming you are referring to only two hydrogen atoms, such as in a sample of hydrogen gas, there is a covalent bond between the hydrogen atoms, as well as a small amount of dispersion forces.
covalent
Hydrogen chloride has a covalent bond.
FeO is an ionic bond. Iron (Fe) is a metal and oxygen (O) is a non-metal, so they tend to form an ionic bond where Fe loses electrons to form Fe2+ cation and O gains electrons to form O2- anion.
A covalent bond which is either double or triple covalent bond.
According to theory it has ionic bonding because a metal bonds with a non-metal. However, because there is not a large difference in electronegativity a bond is formed that is not exactly ionic nor covalent but an intermediate (the difference needs to be higher than 1.8 for an ionic bond to form, Fe has 1.8, O has 3.4 -> 1.6 difference). What this actually means is that Fe does not completely give away its three electrons to become Fe+3 because Oxygen doesn't attract them strong enough, or because Fe attracts them strongly too. Instead, they share the electrons as in a covalent bond. The bond is definitely polar (to give you an idea, the electronegativity difference between hydrogen and oxygen in water is 1.2, H has 2.2 and oxygen again 3.4. This gives rise to Hydrogen bonding, which is due to the polarity of the water molecule.). To conclude, the bond is an intermediate between an ionic and a covalent bond, and it is definitely polar.