What are the characteristics of ideal (or nearly ideal) solutions? o a. they follow raoult's law, which means partial pressure of components a and b in a solution will be pia] = piao! times x[a] and pib-p[bol times x[b] where pia0] and p[bo] are respective vapour pressure in pure form and x[a] and x[b] are respective mole fractions of components a and b ia) and pib) piboj times x1b] where piao] and pibo] o b. the enthalpy of mixing of two components should be zero. this signifies that no heat is released or absorbed during mixing of two pure components to form ideal solution. o c. the volume of mixing of two components should be zero. this means that total volume of solution is equal to the sum of the volume of solute and solution. adding further, it also signifies that there is no occurrence of contraction or expansion of volume while mixing of two components. o d. the solute-solute interaction and solvent-solvent interaction is nearly equal to solute- solvent interaction. o a, b and c o a, b and d o all of the above

you need to take a look at the periodic system in order to sort these elements into pairs that would most likely exhibit similar chemical properties. first, you need to find elements that are found in the same group (groups are vertical in the periodic system), and then to see whether they have the same valence number. if they meet these criteria, they will have similar properties.

the first pair: ne (neon) and kr (krypton), are noble gases found in group 8

the second pair: li (lithium) and k (potassium), found in group 1

the third pair: s (sulfur) and te (tellurium), found in group 6

nacl or sodium chloride is an ionic compound. this is because an ionic compound pertains to a compound that consists of positively and negatively charged ions. in this case, na (sodium) has a tendency to lose one electron when it reacts with with other atoms, so the resulting sodium ion contains 11 protons and 10 electrons, thus making it positively charged (na+), when chlorine reacts, it usually gains one electron to form an ion called chloride, thus making it negatively charged ( since the ions are oppositely charged, they attract.