A 3.7145 g portion of disodium EDTA dihydrate (M. W. 372.24) was dissolved in enough distilled water of prepare 1.000 L of solution. A 100.0 mL water sample was adjusted to pH 10 and titrated to the Eriochrome Black T end point with 11.23 mL of the EDTA solution. When the pH of another 100.0 mL water sample was adjusted to pH 12 and titrated with EDTA, 2.11 mL of titrant was required. Calculate the concentration of Ca(II) and Mg(II) in the water. Express the answers in mg/L of CaCl2 and MgSO4, respectively.

answer: option (b) is the correct answer.

explanation:

a covalent bond is formed by sharing of electrons. whereas polarity arises due to difference in electronegativity of two atoms.

therefore, more is the electronegativity of an atom which combines with the titanium, more readily it will induce a partial positive and negative charge.

thus, out of the given options fluorine is most electronegative and has an incomplete octet. therefore, it will readily combine with titanium to share the electrons and complete its octet.  

particle   p is an electron and particle q is a neutron