Which solution has the lower freezing point 1.0 m kbr or 1.0 m cabr2?

the solution 1.0 M Ca Br2.

This is becasue the freezing point depression is a colligative property.

A collegative property is one that depends on the number of particles in solution.

Each mole of KBr will produce two moles, one mole of potassium ion and one of bromine ion

 Each mole of CaBr2 will produce three moles, one of calcion ion and two of bromine ion.

Then, the depression of the frezzing point will be greater in the case of the CaBr2, leading to a lower freesing point of the 1.0 M soluction.

Ch4 and ph3 are both covalent since they are composed both of non-metals.    ch4 is non- polar because of  london forces and has a geometry of tetrahedral  ph3 , on the other hand, is umbrella shaped polar and has dipole-dipole intermolecular force (imf) . since ph3 is polar, it has a stronger imf