A (200 ~W , 100 ~V ) bulb is connected in series with an electrolytic cell. If an aqueous solution of an Sn-salt is electrolysed for (5 hrs ), (11.1 ~g ) of ( Sn ) gets deposited. The chemical formula of the compound is (Given atomic weight of ( Sn ) is (118.7 ~g ~mol ⁻¹ )).

Step-by-step solution

( w= E i t F = A n i t F ) ( n= A i t w F = 118.7 2 (5 3600) 11.1 96500 =3.989 ) (A= ) atomic weight of ( Sn =118.7 ~g ~mol ⁻¹ ) (i= current = 200 ~W 100 ~V =2 ~A ) (t= time =5 hrs (5 3600 ~s ) ) (E= A n = ) equavalent weight of ( Sn ^ n+ ) (n= ) valency of ( Sn ) in the salt (w= ) mass of ( Sn ) deposited (=11.1 ~g ) Here, ( SnO ) and ( SnO ₂ ) are non-electrolytes (aqueous). So, valency of ( Sn ) will be 4 in ( SnCl ₄ ( Sn ⁴⁺+4 Cl ⁻ ) ).