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In which type crystal a = b ne c, alpha ...

In which type crystal `a = b ne c`, `alpha = beta = gama = 90^@`.

A

Octahedral

B

Tetragonal

C

Orthohomlaic

D

hexagonal

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Assertion (A) : Graphite is an example of tetragonal crystal system. Reason (R ) : For a tetragonal system, a = b != c and alpha = beta = 90^(@), gamma = 120^(@) .

The unit cell with crystallographic dimensions, a ne b ne c, alpha =gamma=90^(@) and beta ne 90^(@) 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. The C.N of cation occuppying an octahedral vois is:

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