(a) Initial volume of cube =(10)3=1000cm3 V when cube is chopped along length then it will form cuboid in which length =6cm breadth =10cm height =10cm Adsorption power ∝ more surface area ∝6cm∝6×(10)2∝600cm2 Final surface area of the cuboid =2(l×b+b×h+h×l) Area of cuboid =2(2×10+100+20)=280cm2 For final cuboid area =280×5=1400cm2 So, final adsorption power ∝1400cm2