Q.

Ka1,Ka2 and Ka3 are the respective ionisation constants for the following reactions.H2 S ⇌ H++HS-HS-⇌ H++S2-H2 S ⇌2 H++S2-The correct relationship between Ka1,Ka2,Ka3 is

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a

Ka3=Ka1×Ka2

b

Ka3=Ka1+Ka2

c

Ka3=Ka1-Ka2

d

Ka3=Ka1/Ka2

answer is A.

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Detailed Solution

For the reaction, H2 S⇌H++HS-Ka1= H+HS-H2 SFor the reaction, HS-⇌ H++S2-Ka2=H+S2-HS-When, the above two reactions are added, their equilibrium constants are multiplied, thusKa3= H+2 S2-H2 S= Ka1×Ka2Hence, Ka3=Ka1×Ka2
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Ka1,Ka2 and Ka3 are the respective ionisation constants for the following reactions.H2 S ⇌ H++HS-HS-⇌ H++S2-H2 S ⇌2 H++S2-The correct relationship between Ka1,Ka2,Ka3 is