Question

suggest ways to seperate the mixture of sand ,sugar and ammonium chloride

Answer 1

Firstly we will sublimate the mixture so that ammonium chloride gets sublimed. Then we will dissolve the sand and sugar in water then we will filter it. After it we will evaporate the sugar solution.

Answer 2

to seperate the mixture of sand first do sedimentation and then decantation
do the process of sublimation to seperate ammonium chloride and do the process of crystalisation to seperate sugar