What does `10H_2O` signify in the formula :`Na_2CO_3.10H_2O` ?

The formula unit of H_(2)O is

Match the following 1) Plaster of Paris 1) CaSO_412H_2O b) Gypsum 2) Na_2CO_3*10H_2O c) Washing soda CaSO_4*2H_2O

When a mixture of LiO_(2)CO_(3) and Na_(2)CO_(3) 10H_(2)O is heated strongly, there occurs a loss of mass due to

The oxidation state of tungsten in Na_(2)W_(4)O_(13).10H_(2)O is ?

Match the following a) Bleaching powder 1) Na_2CO_3*10H_2O b) Baking soda 2) NaHCO_3 c) Washing soda 3) CaOCl_2

What are A and B in the following reactions? (I) CH_3 CO_2 H underset( Red p)overset( HI) to A (II) 2CH_3 CO_2 H overset( P_4O_10 ) to B