What type of substances would make better permanent magnets, ferromagnetic or ferromagnetic. Justify your Solution.
A group 14 element is to be converted into n-type Semiconductor by doping it with a suitable impurity. To which group should this impurity belong?
Ionic solids, which have anionic vacancies due to metal excess defect, develop colour. Explain with the help of a suitable example.
Explain how vacancies are introduced in an ionic solid when a cation of higher valence is added as and impurity in it.
What type of stoichiometric defect is shown by: (i) ZnS (ii) AgBr
What type of defect can arise when a solid is heated? Which physical property is affected by itand in what way?
An element with molar mass 2.7 × 10-2 kg mol-1 forms cubic unit cell with edge length 405 pm. If its density is 2.7 × 103 kg m-3 what is the nature of the cubic unit cell?
Which of the following lattices has the highest packing efficiency (i) simple cubic (ii) bodycentred cubic and (iii) hexagonal close-packed lattice?
A compound is formed by two elements M and N. The element N forms ccp and atoms of M occupy 1/3rd of tetrahedral voids.
A compound forms hexagonal close-packed structure. What is the total number of voids in 0.5 mol of it? How many of these are tetrahedral voids?
What is the two dimensional coordination number of a molecule in square close packed layer?