Why is a noble gas different from other elements?

Acar of mass m goes around a banked curve of radius r with speed v. if the road is frictionless due to ice, the car can still negotiate the curve if the horizontal component of the normal force on the car from the road is equal in magnitude to 101) a) mv2/r b) mg/2. d) mg e) tan[v2/(eg)]

What is meant by the statement" the melting poin of glycerine is 13 degree celsius

Could someone . i have tried to solve myself but my calculation is off