Which of the following has least packing fraction?
Simple cubic unit cell has least packing efficiency that is 52.4%.
Which of the following has the most effective packing fraction in 3d space?
packing efficiencies are : simple cubic = 52.4% , Body – centred cubic = 68% , Hexagonal close-packed = 74 % thus, hexagonal close – packed lattice has the highest packing efficiency.
What is the physical significance of packing fraction?
the packing fraction of a nucleus is the ratio of its mass defects per no. of nucleons. packing fraction = mass defect/mass no. packing fraction is directlyrelated to its availability of nuclear energy and the stability of the nucleus.
What is the packing fraction of HCP?
74%
What is the packing efficiency of HCP?
The packing efficiency of both types of close packed structure is 74%, i.e. 74% of the space in hcp and ccp is filled. The hcp and ccp structure are equally efficient; in terms of packing. The packing efficiency of simple cubic lattice is 52.4%. And the packing efficiency of body centered cubic lattice (bcc) is 68%.
What do you mean by packing fraction?
: a measure of the loss or gain of total mass in a group of nucleons when they are brought together to form an atomic nucleus : the ratio multiplied by 10,000 of the mass defect to the mass number.
In which pair most efficient packing is present?
Thus, the correct answer is (B) hcp and ccp structures have the efficient close packing.
Which of the following statement is not true about the hexagonal close packing?
(d)- In this arrangement the sphere of the fourth layer is exactly aligned with those of the first layer. This statement is incorrect, because they form ABAB patterns. So, the correct answer is “Option D”. Note: In the above discussion hcp refers to hexagonal close packing and ccp refers to cubic close packing.
Which one of the following is not a closed packing?
Thus, bcc is not a close packing.
What is the coordination number in a square close packed structure?
4
Which of the following is not true about ionic solids?
Smaller ions occcupy either the tetrahedral or the octahedral voids depending upon their size. The fraction of octahedral or tetrahedral voids occupied depends upon the radii of the ions occupying the voids. d is not ture.
Which of the following statement is true for ionic solids?
Ionic solids are soluble in non-polar solvent.
Which of the following is a network solid?
We know that each carbon atom forms covalent bonds with other three carbon atoms and hence the resultant structure is called a network solid as it is spread in three dimensions in space. So, the correct answer is option (C) Diamond.
What is true about ionic solid?
Ionic solid have high vapor pressures because they have very strong intermolecular forces holding the molecules together in a crystalline structure.
Which of the following is more ionic solid?
So KCl is more ionic.
What is the maximum charge an ion can have?
if it is an ion from an atom or a complex anion, it is the number of electrons present on a ion that can withstand the coulombic repulsion and does not compel the complex anion to break off into smaller bits (CoCl4^2-) and for a single ion (Cl-)that generates from an atom, the maximum negative charge it can hold has …
Which is a pseudo solid?
Pseudo solid is a solid which possesses the property of liquids. Glass is a pseudo solid and in a very slow process, it flows like a liquid due to which the base of glass gets thicker than top.
Is rubber a pseudo solid?
Answer. Amorphous solids. They are also called “pseudo solids.” Examples of amorphous solids include glass,rubber, gels and most plastics.
Is glass a pseudo solid?
Glass, however, is actually neither a liquid—supercooled or otherwise—nor a solid. It is an amorphous solid—a state somewhere between those two states of matter. And yet glass’s liquidlike properties are not enough to explain the thicker-bottomed windows, because glass atoms move too slowly for changes to be visible.
What is pseudo solid example?
Pseudo solids are those types of solids which have appearance as solid but still they act like liquid like they have a tendency to flow which is quite slow and it is so slow that you can’t observe it with naked eye. You can also say that it has high viscosity. Glass and pitch are examples of pseudo solids.
Which one is called pseudo solid glass nacl all?
Answer: Glass ( pseudo solid or super cooled liquid.) glass is called a super cooled liquid because of its ability to flow in heating.It is also called a pseudo-solid However it is correct to write that “Some substances can only be cooled below the glass transition temperature if they are supercooled.