Final answer:
Water (H₂O) is the compound with two unshared pairs of electrons, making it the correct answer. It has a bent molecular geometry due to these two lone pairs.
Step-by-step explanation:
The compound c. H₂O is the one that has two unshared (lone) pairs of electrons. In water (H₂O), the oxygen atom is bonded to two hydrogen atoms with single covalent bonds, and it also has two lone pairs of electrons. Therefore, there are two unshared pairs of electrons around the oxygen atom, completing the octet of oxygen and giving water a bent shape according to VSEPR theory.
Let's briefly look at the other options: a. SiH₄ has no lone pairs on the silicon atom as it forms four single covalent bonds with hydrogen atoms. b. H₃O has one lone pair on the oxygen atom. d. H₂, being a diatomic molecule with a single covalent bond, does not have any lone pairs.