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Why is the dipole moment of NH3 greater then that of NF3 ??
chemistry chapter wise marks(cbse board)
what is F centre?
If Nacl is doped with 10-3 mole % of Srcl2 , what is the concentration of cation vacancies?
equivalent weight of silver nitrate
why are frenkel defects not found in pure alkali halides?
what is the full form of hcp and ccp?
best reference books for class12 science[cbse]
Q. Why old glass objects appear slightly milky instead of being transparent?
1. what r true solids and pseudo solids?
2. why crystalline solids are true solids and amorphous solids r pseudo solids?
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 _____?
difference between molten and aqueous???
what is cryoscopic constant?
What are voids?How many types of voids are there?
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?
which of the following is an example of metallic crystal solid?
(a) C ( b) Si (c) W (d) AgCl
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?
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
Which point defects lowers the density of a crystal?
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
a solid has 3 types of atoms namely x,y and z .x forms an fcc lattice with y atoms occupying all the tetrahedral voids and z atoms occupying half the octahedral voids. what is the formula of the 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-
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????
an element of atomic mass 98.5g/mol occurs in FCC structure. if unit cell edge is 500pm and density is 5.22g/cm3, what will be the value of avogadro constant?
what r the differences between tetrahedral and octahedral void?
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?
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
two differences between tetrahedral void and octahedral void?
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.......
difference between schottky defect and frenkel defect
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???
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]
whta type of crystal defect is produced when NaCl is doped with MgCl2?
which stoichiometric defect in crystals increases the density of a solid?
what is the correct answer?
Which type of molecular solid can CCl4 be classified into?
CCl4can be classified into a covalent molecular solid.
is t non polar.which is preffered for the answer.since you hav given two different answers in the chapter test: subjective as the first one and mcq the second reason.
What are non-polar molecular solids?
what is probable coordination number of X^+ ion in XY if radii of X^+ & Y^- ions are 200 pm & 300 pm respectively?
pls explain metal excess and metal deficiency defect again...or by a video...ASAP
Ques.Which point defect in its crystal units alters the density of a solid?
2008 CBSE Delhi
Sol:Schottky defect in crystals units alters the density of a solid.
it isnt only schottky defect isnt it? it can also be vacancy and interstitial defect isnt it?
valency of silver nitrate
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..
can u store copper sulphate solution in zinc pot?
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???
conductivity of silicon increases on doping it with phosphorus reason
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.)
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?
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?
Strontium chloride has a fluorite structure, which of the following statement is true ?
1. The strontium ions are in a body-centered cubic arrangement
2. The strontium ions are in a face-centered cubic arrangement
3. each chloride ion is at the centre of a cube of 8 strontium ions
4. each strontium ion is at the centre of a tetrahedron of 4 chloride ions
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