What kind of solid tends to have the lowest melting points apex?

The molecular solid tends to have a lower melting points. Considering its properties, the molecules of this type of solid are held together by van der Waals forces rather than by ionic or covalent bonds. Its dipole forces are weaker than ionic or covalent bond. The relatively weak intermolecular forces cause molecular solids to have relatively low melting points of approximately less than 300 degrees Celsius. Molecular solid also tends to dissolve in organic solvents. Thus, most molecular solids are relatively soft, insulators and are characteristically low in density. Examples of which includes water ice, solid carbon dioxide and sucrose/table sugar.

c. because step up transformer steps up the input voltage i.e increases the input voltage  

the number of turns are greater on the secondary side of step up transformer  

transformer does not handle dc current

the correct answer is b. a strong acid completely dissociates to its ions when dissolved in water. completely dissociates to and ions. a is incorrect because does not fully ionize to and ions and some remain as the compound . c and d are incorrect because, and do not fall into the category of bronsted lowry acids. a bronsted lowry acid is a proton donor and since both molecules do not have a proton to donate they are not bronsted lowry acids. likewise,   if we use the lewis acid definition, they cannot be acids. a lewis acid is an electron pair acceptor. both and have a complete octet so can not accept any electrons which disqualifies them as acids.