Which one of these NH4CL(s), CuCL2(s), SiCL4(l) contains both ionic and covalent bond and why?Also predict two physical properties other than...

For the first part of the question, NH4CL contains both an
iconic and covalent bond.  The ammonium ion is polyatomic, which means it forms ionic
salts.  Therefore whatever bonds it makes are ionic.  That said however, the bond
between N and H is covalent because both N and H are
non-metals.

The other two bonds are both ionic (copper and
silicon are metals, chlorine is a non-metal).

For the
second part of the question, because we know that NH4 forms ammonium salts we can know
some of the properties of NH4Cl: It will be a white powder; its taste will be salty; it
will have no odor; it will not melt, but does sublime; and it will be easily dissolvable
in water, but insoluble in acetone.