Central Board Of Secondary Education [CBSE] — Regarding wrong answer in answer key

In chemistry paper-056/1/4
In question no. 46 answer should be c as in the reason its is given that osmotic pressure of a solution depends on molar concentration of solute at any temperature but in chemistry book ncert it is given that osmotic pressure depends on molar concentration at a given temperature.
Also in question no 42 ans should be(both b and d) as both the options are incorrect . fluorine forms two oxo acid.
In question 35 freezing point should be positive so correct options in c
46-(ans c) and 42(both b and d) question 35-(ans c)