Call me

Have a Query? We will call you right away.

+91

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)

What are you looking for?

Syllabus

Why is the dipole moment of NH

_{3}greater then that of NF_{3}??If Nacl is doped with 10

^{-3 }mole % of Srcl_{2 }, what is the concentration of cation vacancies?chemistry chapter wise marks(cbse board)

what is F centre?

equivalent weight of silver nitrate

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

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?

Q. How many effective $N{a}^{+}andC{l}^{-}$ ions are present respectively in a unit cell of NaCl solid (Rock salt structure). If all ions along line connecting opposite face centres are absent?

What is Schottky and Frenkel defects?

1)AB

_{3}CD_{3}_{ }2)ABCD 3)AB_{6}C_{2}D_{2}_{ }4)AB_{6}C_{2}D_{4}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 _____?

a mineral having formula AB

_{2 }crystallises in the ccp lattice, with A atoms ocupying the lattice points.what is the coordination numer of A and B atoms

what is cryoscopic constant?

^{3}and the molar mass of the substance is 60.23g/mol?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?

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-}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)

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?

Q12. In a unit cell containing X

^{2+}, Y^{3+}and Z^{2–}where X^{2+}occupies 1/8^{th}of tetrahedral voids, Y^{3+}occupies 1/2 of octahedral voids and Z^{2–}forms ccp structure. Then formula of compound is(1) X

_{2}Y_{4}Z (2) XY_{2}Z_{4}(3) XY

_{3}Z_{4}(4) X_{4}YZ_{2}Q13. On rising temperature and decreasing pressure in CsCl solid

(1) C.N, of metal ion increases from 6 to 8.

(2) Number of formula unit per unit cell (Z) changes from one to four

(3) Density of unit cell is increased

(4) $\frac{{\mathrm{f}}_{+}}{{\mathrm{f}}_{-}}$ (radius ratio) is increased

what is pseudo solid

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?

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

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

what r the differences between tetrahedral and octahedral void?

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 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!!!!!!.

In a CCP type structure if half of the face centred atoms are removed, then percentage void in unit cell is

difference between schottky defect and frenkel defect

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?^{-}at each corner and Cs at the centre of the unit cell.if the radius of of Cs is 1.69Å and r_{cl}^{-}= 1.81Å, what is the edge length of unit cell?What is the difference between crystal lattice and unit cell?

calculate the number of atoms in cubic based unit cell having one atom at each corner and two atoms at body diagonal.

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?

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

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???

Q.26. Salt AB has a zinc blende structure. The radius of ${A}^{2+}and{B}^{2-}$ ions are 0.7 Å and 1.8 Å respectively. The edge length of AB unit cell is

(1) 2.5 Å

(2) 5.09 Å

(3) 5 Å

(4) 5.77 Å

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

2 -7 xl03 kgm-

3 . Calculate edge length of the unit cell. Given atomic mass of

aluminium equal to 27 ?0amu.

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

What type of stoichiometric defect is shown in Zns and AgBr?

What are non-polar molecular solids?

The density of crystalline CsCl is 3.988 g/cm

^{3}. The volume effectively occupied by a single CsCl ion pair in the crstal is [molecular mass CsCl=168.4](A)7.01 X 10

^{-23}cm^{3}(B)2.81 X 10

^{-22}cm^{3}(C)6.022 X 10

^{23}cm^{3}(D)3.004 X 10

^{-23}cm^{3}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}^{+}B^{- }has a structure with B^{-}ions constituting the lattice and A^{+ }ions occupying 25% tetrahedral holes. what is the formula of the solid?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

_{2}in dry cell(i) Si O

_{2}(ii) Mg O (iii) SO_{2}(s) (iv) Cr O_{2}Q.11. 10 g of argon gas is compressed isothermally and reversibly at a temperature of 27$\xb0$C from 10 L to 5 L. Calculate q and $\u2206H$ for this process. Atomic wt. of Ar = 40.

1) + 103.99 cal, 0

3) - 39.99 cal, 3 J

2) + 39.99 cal, 3 J

4) - 103.99 cal, 0

pls explain metal excess and metal deficiency defect again...or by a video...ASAP

1) 1/5

2) 2/5

3) 3/5

4) 4/5

ALSO PLZ GIVE A GENERAL IDEA ON HOW TO SOLVE SUCH QUESTIONS QUICKLY

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

^{-3}.What is the edge length of the unit cell.valency of silver nitrate

a certain sample of cuprous sulphide is found to have a composition of Cu

_{1.92}S because of incorporation of Cu2+ in the lattice.what is the ratio of Cu

^{2+}to Cu^{+?(0.043:1}why frenkel defect does not change the density of agcl crystals???

(1) A3B4 (2) AB (3) A4B3 (4)A2B3

what is the difference between isomorphism and polymorphism pls explain with some examples too..

(A) 200 pm

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

(C) 142.2 pm

(D) $\sqrt{2}$ pm

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

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?Q1)What is the coordination no. of each type of ions in a rock-salt type crystal structure? how?

(a) 1.29 * 10

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

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

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

^{-24 }gmPotassium 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)

A crystal of lead(II) sulphide has NaCl structure. In this crystal the shortest distance between Pb

^{+2}ion and S^{2–}ion is 297 pm. What is the length of the edge of the unit cell in lead sulphide?^{–5}cm^{–8}cm^{–8}cm^{–8}cm