Match the type of packing given in Column I with the items given in Column II {:( " Column I " , "Column II") , ( "(i) Square close packing in two dimensions" , "(a) Triangular voids" ),( "(ii) Hexogonal close packing in two dimensions " , "(b) pattern of spheres is repeated in every fouth layer") , ( " (iii) Hexongaonal close packing in three dimensions" , "(c) Coordination number 4" ),( " (iv) Cubic close packing in three dimensions " , "(d) Pattern of sphere is repeated in alternate layers"):}

Match the type of packing given in Column I with the items given in Co

1.	Match the type of packing given in Column I with the items given in Column II {:( " Column I " , "Column II") , ( "(i) Square close packing in two dimensions" , "(a) Triangular voids" ),( "(ii) Hexogonal close packing in two dimensions " , "(b) pattern of spheres is repeated in every fouth layer") , ( " (iii) Hexongaonal close packing in three dimensions" , "(c) Coordination number 4" ),( " (iv) Cubic close packing in three dimensions " , "(d) Pattern of sphere is repeated in alternate layers"):}
Answer» Solution :SIMPLE vacancy defect and simple intersitial defgect OCCUR in non-ionic solids. In the FORMER, some lattice sites are vacant. Hence, DENSITY decreases. In the latter, some extra constituent paricles are present in the intersitial sites. Henc,e density increases