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Why is the dipole moment of NH

_{3}greater then that of NF_{3}??chemistry chapter wise marks(cbse board)

If Nacl is doped with 10

^{-3 }mole % of Srcl_{2 }, what is the concentration of cation vacancies?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?

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 are frenkel defects not found in pure alkali halides?

best reference books for class12 science[cbse]

equivalent weight of silver nitrate

Q. Why old glass objects appear slightly milky instead of being transparent?

What is Schottky and Frenkel defects?

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 S_{2}O_{32-}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 _____?

The pyknometric density of sodium chloride crystal is 2.165 x 10

^{3}kg m^{-3 }while its X-ray density is 2.178 x 10^{3}kg m^{-3}. The fraction of the unoccupied sites in sodium chloride crytal is?what is cryoscopic constant?

which of the following pairs have identical value of e/m? (a)a proton and a neutron (b)a proton and deuterium (c)deuterium and an alpha particle (d)an electron and gamma rays

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 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)

^{-3}.What is the edge length of the unit cell.^{3}and the molar mass of the substance is 60.23g/mol?what is pseudo solid

^{24}atoms(1) N (2) N/2 (3) 2 N (4) 4 N

in a face centered cubic lattice, a unit cell is shared equally by how many unit cells?

how does ferromagnetic substance become a permanent magnet?

what r the differences between tetrahedral and octahedral void?

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

In a fcc arrangement of A and B atoms. A are present at the corners ofthe unit cell and B are present at the face centres. If one atom of A ismissing from its position at the corners, what is the formula of thecompound?two differences between tetrahedral void and octahedral void?

By X-ray diffraction method, the unit length of NaCl is observed to be 0.5627 nm. The density of NaCl is found to be 2.164 g/cm3. What thype of defect exists in the crystal? Calculate the percentage of Na(+)Cl(-) ions missing.

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 ratio of closed packed atoms to tetrahedral holes in cubic close packing is:

(A)1:1

(B)1:2

(C)1:3

(D)2:1

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!!!!!!.

(a) 1.29 * 10

^{-23}gm(b) 1.295 * 10

^{-22 }gm(c) 6.2 * 10

^{-23 }gm(d) 1.29 * 10

^{-24 }gmdifference between schottky defect and frenkel defect

^{3}of N_{2}at 720 mm and 400 cm^{3}of O_{2}at 750 mm pressure are together in a one litre flask. The final pressure of mixture is:(a) 111 mm (b) 222 mm (c) 333 mm (d) 444 mm

Ques.The density of copper metal is 8.95 g cm

can you please explain how it is fcc?d=^{3}. 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 mol^{1}and N_{A}= 6.02 × 10^{23}mol^{1})M.za^{3}.N_{A}On substituting we get,8.95=z.63.546.022X10^{23}X(1.27X10-8)^{3}z=0.17.please help me out! where did i go wrong?(A) 200 pm

(B) $\sqrt{3}/\sqrt{2}$ pm

(C) 142.2 pm

(D) $\sqrt{2}$ pm

What is the difference between crystal lattice and unit cell?

_{2}in dry cella 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???

what is the distance bet'n 2 tetrahedral voids in ccp structure ???????

ans is

1. a/root 2

2.a/2

3.root3*a/2

4.all above

answer is 4

which stoichiometric defect in crystals increases the density of a solid?

what is constituent particles???

What are non-polar molecular solids?

Sodium crystallizes in a BCC unit cell. Calculate the approximate no. of unit cell in 9.2 gm of sodium?

Q.D-6. Among the species, which has the weakest carbon - oxygen bond :

(1). $C{O}_{2}$

(2). $C{H}_{3}CO{O}^{-}$

(3). CO

(4). $C{{O}_{3}}^{2-}$

Write the I.U.P.A.C name:-

i) Fe

_{4 }[Fe(CN)_{6}]_{3}ii) Na

_{3 }[Fe(C_{2}O_{4})_{3}]iii) K

_{3}[Fe(C_{2}O_{4})_{3}]iv)

[Cr(en)_{3}]Cl_{3}v)

[CoBr(H_{2}o)(NH_{3})](NO_{3})_{2}Q.4. The edge length of rock salt type unit cell is 508 pm. If the radius of the cation is 110 pm, the radius of the anion assuming NaCl type structure is

(1) 144 pm

(2) 398 pm

(3) 288 pm

(4) 618 pm

(i) Si O

_{2}(ii) Mg O (iii) SO_{2}(s) (iv) Cr O_{2}pls explain metal excess and metal deficiency defect again...or by a video...ASAP

A solid has a structure in which W Atoms Are Located At The Cube corners of the unit cell,O Atoms are located at the cube edges and the Na atoms at the cube centres.Find The Type Of Lattice And Formula.

whta type of crystal defect is produced when NaCl is doped with MgCl2?

^{-}_{ }ions form a cubical closest packed arrangement , and Li^{+}ions occupy octahedral holes. what is the relationship between the edge length of the unit cells and the radii of the I^{-}ions? calculate the limiting ionic radii of Li^{+}and I^{-}ions if a=600pm.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..

WHT IS OCTAHEDRAL VOID AND TETRAHEDRAL VOIDS

32. The density of solid Ar(Ar=40 g/mole) is 1.68 g/ml at 40 K. If the argon atom is assumed to be a sphere of radius 1.50 x 10

^{-8}cm, then % of solid Ar is apparently empty space ?(A) 35.64 (B) 64.36

(C) 74 (D) None these.

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?

conductivity of silicon increases on doping it with phosphorus reason

why is common salt sometime yellow instead of being pure salt?

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)

_{3}. Then K_{c}for the $\frac{1}{2}{N}_{2}+\frac{3}{2}{H}_{2}\stackrel{}{\rightleftharpoons}N{H}_{3}$ is :a) 0.36 litre mol

^{-1}b) 0.46 litre mol

^{-1}c) 0.5 litre mol

^{-1}d) 0.2 litre mol

^{-1}