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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?
in a solid 'AB' having Nacl structure, A atoms occupy corners of cubic unit cell. if the face centered atoms along one of axis are removed then resultant stoichometry of solid is?
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?
best reference books for class12 science[cbse]
Q. Why old glass objects appear slightly milky instead of being transparent?
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-
What is Schottky and Frenkel defects?
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?
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 _____?
what is cryoscopic constant?
At room temperature, Polonium crystallises in Cubic Primitive Cell. If edge length is 3.0 Angstrome , calculate the theoritical density of Po.(Atomic Wt. = 207gm)
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?
what are LDPE and HDPE? HOW are they prepared?
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)
KMnO4 reacts with oxalic acid according to the equation2MnO4- +5C2O4^2- +16OH- -2MnO2+ + 10CO2 + 8H20here 20 mL of 0.1 M KMnO4 is equivalent to.....
1. 50mL of 0.5 M C2H2O4
2. 20 mL of 0.1 M C2H2O4
3. 20 mL of 0.5 M C2H2O4
4. 50 mL of O.1 M C2H2O4
what is pseudo solid
in a face centered cubic lattice, a unit cell is shared equally by how many unit cells?
what r the differences between tetrahedral and octahedral void?
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?
what is the coordination number in hcp and ccp arrangement????
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?
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.......
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!!!!!!.
difference between schottky defect and frenkel defect
Explain:- Ionic solids are hard and brittle.
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)
valency of silver nitrate
why is common salt sometime yellow instead of being pure salt?
What is the difference between crystal lattice and unit cell?
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?
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???
which stoichiometric defect in crystals increases the density of a solid?
Sodium crystallizes in a BCC unit cell. Calculate the approximate no. of unit cell in 9.2 gm of sodium?
What are non-polar molecular solids?
In orthorhombic the value of a,b,c are respectively 4.2 angstrom , 8.6 angstrom and 8.3 angstrom. Given the molecular mass of the solute is 155gm/mol and that of density is 3.3gm/cc , the number of formula units per unit cell is
Write the I.U.P.A.C name:-
i) Fe4 [Fe(CN)6]3
ii) Na3 [Fe(C2O4)3]
what is the distance bet'n 2 tetrahedral voids in ccp structure ???????
1. a/root 2
answer is 4
pls explain metal excess and metal deficiency defect again...or by a video...ASAP
what is constituent particles???
whta type of crystal defect is produced when NaCl is doped with MgCl2?
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?
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
conductivity of silicon increases on doping it with phosphorus reason
Q1)What is the coordination no. of each type of ions in a rock-salt type crystal structure? how?
Metallic magnesium has a hexagonal close packed structure and has adensity 1.74g cm-3.Assuming magnesium atoms to be spherical, calculate theradius of magnesium atom. (Atomic mass of Magnesium= 24.3).
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)
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