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The unit cell with crystallographic dime...

The unit cell with crystallographic dimensions, `anebnec,alpha=gamma=90^(@),betane90^(@)` is-

A

monoclinic

B

tetragonal

C

triclinic

D

orthorhombic

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The unit cell with crystallographic dimensions, a ne b ne c, alpha =gamma=90^(@) and beta ne 90^(@) is :

The crystal system of a compound with unit cell dimensions a=0.350,b=0.350 and c=0.500 and alpha=beta=90^(@) and gamma=120^(@) is

Knowledge Check

  • Crystal systems with alpha=beta=gamma=90^(@) -

    A
    cubic
    B
    tetragonal
    C
    triclinic
    D
    orthorhombic

  • Which of the following crystal systems has unit cell with alpha=beta=90^(@),gamma=120^(@) (where alpha, betaandgamma are interfacial angles)-

    A
    orthorhombic
    B
    triclinic
    C
    trigonal
    D
    hexagonal

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    The regular three dimensional arrangement of points in a crystal is known as crystal lattice and the smallest repeating pattern in the lattice is called unit cell. The unit cells are characterised by the edge lengths a, b, c and the angles between them alpha, beta and gamma respectively. Based on this, there are seven crystal systems. In a cubic unit cell: a=b=c and alpha = beta=gamma=90^(@) The number of points in simple, body centred and face centred cubic cells are 1,2 and 4 respectively In both the hcp and ccp of spheres, the number of tetrahedral voids per sphere is two while the octahedral voids is one. A double triangular void surrounded by three spheres above and three spheres below is called

    The regular three dimensional arrangement of points in a crystal is known as crystal lattice and the smallest repeating pattern in the lattice is called unit cell. The unit cells are characterised by the edge lengths a, b, c and the angles between them alpha, beta and gamma respectively. Based on this, there are seven crystal systems. In a cubic unit cell: a=b=c and alpha = beta=gamma=90^(@) The number of points in simple, body centred and face centred cubic cells are 1,2 and 4 respectively In both the hcp and ccp of spheres, the number of tetrahedral voids per sphere is two while the octahedral voids is one. The C.N of cation occuppying an octahedral vois is:

    A calorie is a unit of heat or energy and it equals about 4.2 j where 1 J = 1 kg . m^(2). S^(-2) . Suppose we employ a system of units in which the unit of mass equals alpha kg the unit of length equals beta m and the unit of time is lambda s. Show the a calorie has a magnitude 4.2 alpha^(-1) beta^(-2) gamma^(2) in terms of the new units.

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