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Why is the dipole moment of NH3 greater then that of NF3 ??
chemistry chapter wise marks(cbse board)
In an FCC arrangement of P and Q atoms, P atoms are at the corners of the unit cell, Q atoms at the face centres and two atoms are missing from two corners of each unit cell. What is the formula of the compound?
what is F centre?
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
If Nacl is doped with 10-3 mole % of Srcl2 , what is the concentration of cation vacancies?
what is probable coordination number of X^+ ion in XY if radii of X^+ & Y^- ions are 200 pm & 300 pm respectively?
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?
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?
What is Schottky and Frenkel defects?
why does AgBr show both frenkel n schottky defect? and why does ONLY AgBr show both d defects?
What will be the number of unit cell is 938 amu of sodium chloride ?
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?
KF has ccp structure. Calculate the radius of unit cell if the side of the cube is 400 pm. How many F
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?
Which point defects lowers the density of a crystal?
What are voids?How many types of voids are there?
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)
Metal excess defect due to the presence of extra cations at interstitial sites:
When white zinc oxide is heated, it loses oxygen and turns yellow.
Then, zinc becomes excess in the crystal, leading the formula of the oxide to. The excess Zn2+ions move to the interstitial sites, and the electrons move to the neighbouring interstitial sites.
what is meant by??
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-
in a face centered cubic lattice, a unit cell is shared equally by how many unit cells?
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
what is the coordination number in hcp and ccp arrangement????
what r the differences between tetrahedral and octahedral void?
What is latter ion in point 3 in this lesson ?
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!!!!!!.
1) In the normal spinel structure, the oxide ions are arranged in CCP pattern. The Zn2+ ions
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?
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?
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 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)
Sodium crystallizes in a BCC unit cell. Calculate the approximate no. of unit cell in 9.2 gm of sodium?
can u tell me the coordination no. for
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?
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.
whta type of crystal defect is produced when NaCl is doped with MgCl2?
(the question is from Relative molecular mass and mole)
pls explain metal excess and metal deficiency defect again...or by a video...ASAP
what is the difference between isomorphism and polymorphism pls explain with some examples too..
valency of silver nitrate
In NaCl crystal, Cl- ions are in FCC arrangement. Calculate the number of Cl- ions in its unit cell.
why frenkel defect does not change the density of agcl crystals???
name the crystal class for which all four types of unit cells are possible .
can u store copper sulphate solution in zinc pot?
conductivity of silicon increases on doping it with phosphorus reason
The appearance of colour in solid alkali metal halides is generally due to(A)Interstitial position
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?
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)
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?
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?
why argon is considered as a non polar molecular solid?
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