Ka1,Ka2 and Ka3, are the respective ionisation constants for the following reactions.H2S⇌H++HS− HS−⇌H++S2− H2S⇌2H++S2The correct relationship between Ka1,Ka2 and Ka3 is

For the reaction, H2S⇌H++HS− Ka1⇌H+HS−H2S  For the reaction,  HS−⇌H++S2−;Ka2=H+S2−HS− When the above two reactions are added, their equilibrium constants are multiplied, thusKa3=H+2S2−H2S=Ka1×Ka2 Hence Ka3=Ka1×Ka2