Select Board & Class
Why is the dipole moment of NH3 greater then that of NF3 ??
chemistry chapter wise marks(cbse board)
the most closely packed among the following crystal lattices is(A)simple cubic close packing
(B)body centred cubic arrangement
(C)face centred cubic arrangement
(D)both fcc and bcc
what is F centre?
How can non-stoichiometric FeO act as a p-type semiconductor?
If Nacl is doped with 10-3 mole % of Srcl2 , what is the concentration of cation vacancies?
In numericals,we use Z values-1 for sc,2 for bcc and 4 for fcc, but in this given question:
Potassium crystallises in a bcc lattice,hence the coordination number of potassium metal is 8. Why is it so?
equivalent weight of silver nitrate
why are frenkel defects not found in pure alkali halides?
best reference books for class12 science[cbse]
which of the following is an example of metallic crystal solid?
(a) C ( b) Si (c) W (d) AgCl
Q. Why old glass objects appear slightly milky instead of being transparent?
What is Schottky and Frenkel defects?
why does AgBr show both frenkel n schottky defect? and why does ONLY AgBr show both d defects?
The number of atoms in 100g of FCC crystal with density = 10g/cm3 and cell edge equal to 200 pm is equal to _____?
1. what r true solids and pseudo solids?
2. why crystalline solids are true solids and amorphous solids r pseudo solids?
what is cryoscopic constant?
what is the full form of hcp and ccp?
If the radius of the tetrahedral void is r and radius of the atoms in close packing is R, derive the relation between r and R?
A compound formed by elements X and Y crystallizes in the cubic structure where Y atoms are at the corners of the cube and X atoms are at the alteranate faces. What is the formula of the compound?
what is the coordination number of Co in [Co(NO2)2 (en)2]+
Which point defects lowers the density of a crystal?
what are the cocequence of metal excess defect??
calculate the distance between Na+ and Cl- ions in NaCl crystal if its density is 2.165 gcm-3 (molar mass of NaCl = 58.5gmol-1 NA = 6.02 x 10 23 mol-1)
what is pseudo solid
THE density of 3M aqueous solution of sodium thiosulphate is 1.25g/mL. Calculate 1. mole fraction of sodium thiosulphate
2. molalities of Na+ and S2O32-
the three states of matter are solid,liquid and gas. Which of the following statement is/are true about them?
(a) Solids and liquids have viscosity as a common property
(b) The molecules in solid state do not have translation motion
(c) Gases cannot be converted into solids without passing through the liquid phase
(d) Solids and liquids have vapour pressure as a common property
in a face centered cubic lattice, a unit cell is shared equally by how many unit cells?
what is the coordination number in hcp and ccp arrangement????
what r the differences between tetrahedral and octahedral void?
what is probable coordination number of X^+ ion in XY if radii of X^+ & Y^- ions are 200 pm & 300 pm respectively?
atoms of the element B form hcp lattice and those of element A occupy 2by3rd part of tetrahydral voids what is the formula of the compound formed by the element A and B
A unit cell of ccp or fcc lattice is divided into eight small cubes. Then, each small cube has 4 atoms at alternate corners. When these are joined to each other, a regular tetrahedron is formed.
Cnt undrstnd it.. That how tetrahedron is formed on joining them???
two differences between tetrahedral void and octahedral void?
sodium metal crystallizes in BCC structure . Its unit cell edge length is 420pm calculate density. (Atomic mass is 23u and NA= 6.022 x 1023 mol -1.)
Why does KCl turn violet on heating in the potassium vapor?
Please reply to this question as soon as possible.It's very important for me!!!!!!.
25.3 g of sodium carbonate is dissolved in enough water to make 250 mL of solution.If sodium carbonate dissociates completely,molar concentration of sodium ion,Na+ and carbonate ions,CO3^2- are respectively.......
(The queston is from relative molecular mass and mole)
A solution of glycol containing 1.82g per litre has an osmotic pressure of 51.8cm of mercury at 10°C .What is the molecular weight of glycol?
(ans is 62.04)
difference between schottky defect and frenkel defect
wwhich one of the following will have a low heat of fusion?(A)a covalent solid
(B)an ionic solid
(C)a mettallic solid
(D)a molecular solid
Ques.The density of copper metal is 8.95 g cm3. If the radius of copper atom is 127.8 pm, is the copper unit cell a simple cubic, a body-centred cubic or a face centred cubic structure? (Given: At. Mass of Cu = 63.54 g mol1and NA= 6.02 × 1023mol1)
a compound forms hexagonal close packed structure. what is the total number of voids in 0.5mol of it? how many of these are tetrahedral voids?
What is the difference between crystal lattice and unit cell?
Specific volume of cylindrical virus particle is 6.02 * 10-2 cc/gm whose radius and length are 7angstrom and 10angstrom respectively.If NA=6.02 *10^23 find molecular weight of virus???
the unit cell of an element of atomic mass is 96 and density 10.3g/cm3. edge length of 314pm. find the structure of crystal lattice.
Sodium crystallizes in a BCC unit cell. Calculate the approximate no. of unit cell in 9.2 gm of sodium?
what is the distance bet'n 2 tetrahedral voids in ccp structure ???????
1. a/root 2
answer is 4
Write the I.U.P.A.C name:-
i) Fe4 [Fe(CN)6]3
ii) Na3 [Fe(C2O4)3]
which stoichiometric defect in crystals increases the density of a solid?
What are non-polar molecular solids?
Vapours of an organic compound when passed over hot reduced cu at 573k give acetone. Identify the compund.
whta type of crystal defect is produced when NaCl is doped with MgCl2?
pls explain metal excess and metal deficiency defect again...or by a video...ASAP
valency of silver nitrate
name the crystal class for which all four types of unit cells are possible .
why frenkel defect does not change the density of agcl crystals???
what is the difference between isomorphism and polymorphism pls explain with some examples too..
the melting points of polar molecular solids are higher than those of non polar molecular solids yet most of these are gases and liquids at room temperature why ?
Any help is appreciated.
CsCl crystallises in a bcc lattice and has a density of 4.0g/cm3 . calculate the edge length of the unit cell of CsCl.(M.mass of CsCl=168.5, No =6.023 x 1023)
can u store copper sulphate solution in zinc pot?
conductivity of silicon increases on doping it with phosphorus reason
an element has bcc with a cell edge of 288pm the density of the element is 7.2 gm/cm^3. how many atoms are present in 208gm of the element?
WHT IS OCTAHEDRAL VOID AND TETRAHEDRAL VOIDS
Q1)What is the coordination no. of each type of ions in a rock-salt type crystal structure? how?
What is the meaning of Short-range order & long-range order in arrangement of constituent particles?
Potassium crystallizes in a body centred cubic lattice.calculate the approximate number of unit cells in 1g of potassium.(Atomic mass of the potassium is 39u)
The pyknometric density of sodium chloride crystal is 2.165 x 103 kg m-3 while its X-ray density is 2.178 x 103 kg m-3. The fraction of the unoccupied sites in sodium chloride crytal is?
Copyright © 2022 Aakash EduTech Pvt. Ltd. All rights reserved.
E.g: 9876543210, 01112345678
We will give you a call shortly, Thank You
Office hours: 9:00 am to 9:00 pm IST (7 days a week)