A metal has two stable oxidation states a and b. The metal is converted into its lower oxidation state (Ma+) by concentrated H2SO4 and further oxidised to its higher oxidation state (Mb+) by KMnO4. 0.4 moles of the metal liberated 8.96 litres (at STP) of H2 on reaction with H2SO4 to form Ma+ and further required 40 mL of 2 M KMnO4 in acidic medium to form Mb+. The value of (a+b) is

A metal has two stable oxidation states a and b. The metal is converte

1.	A metal has two stable oxidation states a and b. The metal is converted into its lower oxidation state (Ma+) by concentrated H2SO4 and further oxidised to its higher oxidation state (Mb+) by KMnO4. 0.4 moles of the metal liberated 8.96 litres (at STP) of H2 on reaction with H2SO4 to form Ma+ and further required 40 mL of 2 M KMnO4 in acidic medium to form Mb+. The value of (a+b) is
Answer» A metal has two stable oxidation states a and b. The metal is converted into its lower oxidation state $(M^{a +})$ by concentrated $H_{2} S O_{4}$ and further oxidised to its higher oxidation state $(M^{b +})$ by $K M n O_{4}$ . $0.4$ moles of the metal liberated $8.96$ litres (at STP) of $H_{2}$ on reaction with $H_{2} S O_{4}$ to form $M^{a +}$ and further required $40 m L$ of $2 M K M n O_{4}$ in acidic medium to form $M^{b +}$ . The value of (a+b) is