HCl is strictly speaking - a polar covalent molecule with a partial positive charge on hydrogen and a partial negative charge on chlorine. When this is dissolved in water, water too being a polar molecule with a partial positive charge on hydrogen and a partial negative charge on oxygen, hydrogens of HCl are surrounded by oxygens of water forming dipole dipole bonds. So also the chlorines are surrounded by hydrogens of water. When the dipole-dipole bonds are formed, the original bond between H and Cl weakens and ultimately breaks leading to ionization.
I'm not sure what you mean by "purely covalent", since the ionic-vs-covalent distinction is expressed in terms of electronegativity, which can take a range of values (higher values = more ionic). CO is very much a covalent compound though.
it is a covalent compound, though the -OH bond is weakly ionisable.
Though perchloric acid dissociates into ions in an aqueous medium, it is a covalent compound, more accurately, with a polar covalent bond.
Neither. Hydrogen is an element, not a compound. Though it normally occurs in the form of covalently bonded molecules.
It is a covalent compound made by a single covalent bond between hydrogen and chlorine.
I'm not sure what you mean by "purely covalent", since the ionic-vs-covalent distinction is expressed in terms of electronegativity, which can take a range of values (higher values = more ionic). CO is very much a covalent compound though.
Nickel sulfate is an ionic compound though it has covalent bonds within the sulfate ion itself.
it is a covalent compound, though the -OH bond is weakly ionisable.
Though perchloric acid dissociates into ions in an aqueous medium, it is a covalent compound, more accurately, with a polar covalent bond.
Neither. Hydrogen is an element, not a compound. Though it normally occurs in the form of covalently bonded molecules.
It is a covalent compound made by a single covalent bond between hydrogen and chlorine.
A compound made up of hydrogen and nitrogen, for example ammonia (NH3).
No. Oxygen (O2) even if it breaks up into two Oxygen atoms is not ionic. It Is A Covalent Molecule Though.
Hydrogen sulfide (H2S) is the most common example, though hydrogen disulfide (H2S2) also exists.
Cu(NO2)3 doesn't exist, but Cu(NO2)2 does. It is ionic, even though the NO2 anion is covalent.
If a single bond from each is considered, hydrogen bond < covalent bond < ionic bond But when a structure of a compound is considered, this may be different. Though diamond has only covalent bonds, it is among the substances with highest melting points.
SiO2, though silicon dioxide is covalent, not ionic.