Crystalline and Amorphous Solid
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Q. 11. Caesium and chloride ions are in contact along body diagonal in body centered cubic lattice .the edge length of unit cell is 350pm and Cs has a radius of 133 .hence radius of cl ion is
Q. In normal spinel structure there is a closed packedarray of O2- ions. The trivalent cations are presentin(1) 75% of octahedral voids、(2) 50% of octahedral voids(3) 12.5% of tetrahedral voids(4) 25% of octahedral voi
Q. 32 A compound formed of element A present at alternate corners , element B present at alternate face centres and element C present at the body centre of cubic structure. The formula of compound is?
Q. The crystal lattice of electrovalent compound is composed of12.(1) Atoms(2) Molecules(4) Both molecules and ions(3Oppositely charged ions
Q. 25 Tungsten crystalises in bcc lattice.Calculate the number of unit cells in 1.5g of tungsten.(Atomic mass of tungsten=184u)
Q.
Amorphous solids do not have
sharp melting point
characteristic geometrical shapes
regularity of the structure
all of these
Q. A SOLID IS FORMED BY TWO ELEMENTS p and q.Q FORMS CCP AND P OCCUPY 1/3rd of tetrahedr al voids. formula of compound
Q. How many unit cells are present in a cube shaped ideal crystal if NaCl if mass 1.00 g?
Q. in a cubic crystal , if A atoms are present on all the corners , B atoms on alternate face center and C atoms on the body center , then formula of the compound is?
Q. 41. How many octahedral and tetrahedral voids are present in a single unit cell (closed packed)?
Q. A compound is formed of two elemnts Y and Z.The element Z forms ccp and Y atoms occupy 1/3rd of tetrahedral voids.The formula of Compound is? and explain How to calculate arrangement of anions around cations in a crystaline structure?
Q. BaSO4 is least soluble in
1. BaCl2
2. H2O
3. Al2(SO4)3
4. AgNO3
Q. if the anions (X) form hexagonal closed packong and cations (Y) occupy 3/8 of Ov thn the formula of the compound will be??
Q. How more lattice energy causes less solubility ?
Q.
A crystalline solid has
definite geometrical shape
flat faces
sharp edges
all of these
Q. Is Hydrogen Sulphide(H_2S) covalent or ionic compound?
Q. A has fcc arrangement , B is present in 2/3rd of tetrahedral void . what is the formula of the compound
Q. If solubility of Agcl in water is 0.07175 mg L at particular temperature then its solubility product will be
Q.
Which of the following is NOT true for solid crystals?
Definite and characteristic heat of fusion
Isotropic nature
A regular periodically repeated pattern of arrangement of constituent particles in the entire crystal
A true solid
Q. In a crystalline solid, atoms of X form fcc packing andthe atoms of Y occupy all octahedral voids. If all theatoms along one body diagonal are removed then the simplest formula of the crystalline solid will be:
Q. 66 The atoms of element Y from hexagonal close packing and the atoms of element X occupies 23 portion of the number of tetrahedral voids.Write the formula of the compound formed by X and Y.
Q. 10. If A Atoms are present at corners of unit cell and b at alternate face centre then what is formuale AB of the compound
Q. 7. Which of the followiNG structures are symetrical? A xef4 B xef6 C so2 D NH3(+2) Options 1 A and B 2 b and c 3 c and d 4 a and d
Q. A compound is formed by two elements X and Y . Atoms of the element Y (as anions ) make ccp and those of the element X (as cations) occupy all the octahedral voids. Wha is the formula of the compound ?
Q. difference between unit cell and lattice
Q. 46. The ionic radii of RB+ and I- are 1.46 and 2.16 A^° recpectively. The most probable type of structure exhibited by it is (1)CsCl type (2)NaCl type (3)ZnS type (4)CaF2 type
Q. The total number of voids in face centred unit cell is a. 4 b. 8 C. 10 d. 12
Q. What is the relation of solubility wrt its lattice energy and hydration energy??!?
Q.
what do you mean by Cs is used in devising photoelectric cells
Q. Solubility of AgCl in 0.1M CaCl2 is
