The number of atoms in hcp unit cell is………… .

Density of lithium atom is 0.53 g//cm^(3) . The edge length of Li is 3.5 Å .The number of lithium atoms in a unit cell will be……….. . (Atomic mass of lithium is 6.94)

A substance AxBy crystallises in a face centred cubic latice .Atoms of 'A' occupy each corner of unit cell and atoms of 'B' occupy centre of each face of the cube. Total number of atoms of A and B in one unit cell will be………. .

The number of unpaired electrons in O_2 is ……

The number of unpaired electrons in O_2 is ……

The role of a catalyst is to change……….

The role of a catalyst is to change……….

The movement of water and minerals in xylem and the movement of phloem sap in phloem is respactvely ………

Hydrogen peroxide is ……..