\(a\text{) }n_{KMnO_4}=0,2\left(mol\right)\\ BT\text{ }e\Rightarrow5n_{KMnO_4}=2n_{Cl_2}\\ \Rightarrow n_{Cl_2}=0,5\left(mol\right)\Rightarrow V=11,2\left(l\right)\)
b) 2NaOH + Cl2 ---> NaCl + NaClO + H2O
______1________0,5_______0,5______0,5
\(\Rightarrow C_{M\left(NaOH\right)}=0,5\left(M\right);C_{M\left(NaCl\right)}=1,25\left(M\right);C_{M\left(NaClO\right)}=1,25\left(M\right)\)