Assertion :There are seven types of crystal system and 14 types of Bravais lattices. Reason: Rhombohedral, triclinic and hexagonal crystal systems have only primitive unit cell.
Lithium sulphate does not form alums.
Li+ is too small to form a stable lattice required for double-salt/alum formation.
Assertion: All the points (1, 0), (-1, 0), (2, 0) and (5, 0) lie on the x – axis. Reason: Equation of the x-axis is y = 0 Choose the correct option.
Assertion: Be and Al have similar properties.
Reason: Be2+ and Al3+ have nearly the same charge/volume ratios and similar polarising power.