The Crystal system of a compound with unit cell dimensions a=0.387nm,b=0.387nm and C=0.504nm and `alpha=beta=90^(@)` and `gamma=120^(@)` is

The crystal system of a compound with unit cell dimensions a=0.387,b=0.387 and c=0.504 and alpha=beta=90^(@) and gamma=120^(@) 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

The crystal system of a compound with unit cell dimensions a = 0.388 , b = 0.388 and c = 0.506 nm and alpha = beta = 90^@ and gamma = 120^@ is

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

The unit cell with crystallographic dimensions , a= b nec " and " alpha = beta=gamma = 90^0

if a=b ne c and alpha=beta=gamma=90^(@) , the crystal system is

Example of unit cell with crystallographic dimensions a!=b!=c, alpha=beta=gamma=90^(@) is :

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^(@) .

Pick up the correct statement: (a) The crystal of AgBr does not have Schottky defect (b) The crystal system having crystal parameters, a = b != c, alpha= beta= 90^(@), gamma= 120^(@) is for a hexagonal unit cell (c) Ionic compounds having Frenkel defect, generally show a low radius ratio value. (d) The coordination number of Na^(+) ion in NaCl is 4

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. In a face centred cubic cell, an atom at the face contributes to the unit cell