By X-ray studies, the packing atoms, in a crystal of gold is found to be in layers such that starting from any layer, every fourth layer is found to be exactly idenctical. The density of gold is found to be ` 19.4 g cm^(-3)` and its atomic mass is 197 a.m.u. Assuming gold atom to be spherical , its radius will beA. 203.5 "pm"^(2)`B. 143.9 pmC. 176. 2 pmD. 287 . 8 pm

By X-ray studies, the packing atoms, in a crystal of gold is found to

1.	By X-ray studies, the packing atoms, in a crystal of gold is found to be in layers such that starting from any layer, every fourth layer is found to be exactly idenctical. The density of gold is found to be ` 19.4 g cm^(-3)` and its atomic mass is 197 a.m.u. Assuming gold atom to be spherical , its radius will beA. 203.5 "pm"^(2)`B. 143.9 pmC. 176. 2 pmD. 287 . 8 pm
Answer» Correct Answer - c For fcc, ` r = a/(2sqrt2) = 0.3535 a` ` = 0.3535 xx 407 "pm" = 143.9" pm"`

Discussion

No Comment Found

Related InterviewSolutions

Iodine molecules are held in the crystals lattice by ……..A. London forcesB. dipole-dipole interractionsC. covalent bondsD. coulombic forces
Iodine molecules are held in the crystal lattice by:A. London forcesB. Dipole -dippole interactionsC. Covvalent bondsD. Coulombic forces
Which of the following compounds are not isomorphous? a. Copper sulphate and zine sulphate b. Zinc sulphate and manganeous sulphate c. Calcium carbonte and ferrous sulphate d. Zine sulphate and ferrous sulphate
How many unit cells are present in a cube-shaped crystal of NaCl of mass 1.00g?A. `2.57xx10^(21)` unit cellsB. `5.14xx10^(21)` unit cellsC. `1.28xx10^(21)` unit cellsD. `1.71xx10^(21)` unit cells
Which of the following statements is/are correct?A. Dislocation of ion from lattice site to intersitial site is called Frenkel defect.B. Missing of +ve and -ve ions from their respective postion producing a parir of holes is called Sschorttky defect.C. The presence of ions in the vacant intersitial sites along with lattice point is called interstital defect.D. Non-stoichiometric NaCl is yellow solid.
which of the following is not the characteristic of ionic solids?A. Very low value of electrical conductivity in the molten stateB. Brittle natureC. Very strong forces of interactionsD. Anisotropic nature
For which of the following cases, answer is `4`A. Coordination number of `Zn^(2+)` in `Z` inc blendeB. Number of body diagonal planes in a cubeC. Formula units in rock salt structureD. Formula units in `CsCl` structure
The existence of a substance in more the one solid modifications is known as//or .Any compound having more than two cystal structures is calledA. IsomorphismB. Polymorp hismC. NeomorphismD. Crystallomorphism
Ionic solids are characterised byA. Good conductivity in solid stateB. High vapour pressureC. Low melting pointD. Solubility in polar solvents
Aluminium metal has a density of `2.72 g cm^(-3)` and crystallizes in a cubic lattice with an edge of `404 pm`. Which of the following is correct?A. It forms bcc unit cellB. It forms fcc unit cellC. Its `CN = 8`D. Its `CN` is `6`

Discussion

No Comment Found

Related InterviewSolutions

Reply to Comment