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a molecule having a covalent bond can be ionic true or false?

it is a true or false question



This is true because any molecule can have a covalent bond that is ionic depending upon which molecule it has been paired with. A good example is table salt. 

Some atoms form kind of a posse when they meet each other, notably the non-metals that are to the right of the staircase line in the periodic table. An example is the nitrate polyatomic ion. It has 1 nitrogen atom, and 3 oxygen atoms covalently bonded to each other. All together, they need one more electron in order to satisfy the octet rule for N, and the 3 Os. So they stick together and behave as one ion looking for an electron. When they encounter a metal like sodium or lithium, or whatever, they will steal the electron becoming charged -1. The metal loses the electron becoming charged +1. Then the compound sodium nitrate or NaNO3 is ionically bonded through charge, so it has 1 ionic bond and 3 covalent bonds. Hope that helps. 
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5 Answers

Actually, this is true.  Sodium Carbonate, Na2CO3, is an ionic compound that contains covalent bonds within the carbonate anion. 


I agree Will.  Sodium Carbonate is a more complex  molecule than just two indivual atoms like Na and Cl combining to make salt.  Sodium Carbonate could be considered a molecule made from smaller molecules.

  Thanks for expanding on the question!   Bruce S.

Polyatomic ions involve sharing of electrons (covalent) and gaining/losing electrons (ionic) to fulfill their octet. 

actual definition of covalent bond is the sharing of electron between two non-metals and that of ionic bond is transfer of electron from a metal to non-metal. moreover, a molecule is by definition called a molecule as it exhibits covalent bonding and those who exhibit ionic bonds are called compounds. so if we consider a polyatomic ion then we may have covalent bonds in its individual polyatomic bond which in turn undergoes ionic bonding thus giving ionic bonds! so answer is true from polyatomic ion's perspective though the language of question gets questionable if the polyatomic ions are not included in it though, I will assume that is not the case!

True. Polyatomic ions such as sulfate (SO42-), phosphate (PO43-), and carbonate (CO32-) are formed by covalent bonding between their constituent atoms.

Water, H2O, has covalent bonds.  Salt, NaCl, has ionic bonds.  In the ionic bond an electron is literally exchanged from one atom to the other in the molecule. For example, in salt Na gives up an electron to Cl.  This makes the orbitals in the atoms completly populated.   In covalent bonds the electron is 'shared' between the atoms. 

  A molecule having a covalent bond cannot be ionic.