How are 0.50 m `Na_2 CO_3` and 0.50 M `Na_2CO_3` different ?

Na_2CO_3 is a salt of

For 0.1 M of NaCl and 0.1 M of Na_2SO_(4) solution , which of the following statement is TRUE ?

A circular coil having 50 turns each of radius 0.05 m carries a current of 1 A. The magnitude of magnetic induction at a point 0.2 m from its centre on its axis is

A circular coil having 50 turns each of radius 0.05 m carries a current of 1 A. The magnitude of magnetic induction at a point 0.2 m from its centre on its axis is

If Na_2CO_3 is added to the solution of H_2CO_3 , the pH of H_2CO_3 solution

1 gram of carbonate (M_(2)CO_(3)) on treatment with excess HCl produces 0.01186 mole of CO_(2) . The molar mass of M_(2)CO_(3) in g "mol"^(-1) is ____________.

The standard reduction electrode potential values of the elements A, B and C are + 0.68, - 2.50 and -0.50 V respectively. The order of their reducing power is