Question

answer me question number 28 and 30 please
[ FROM THE CHAPTER  CHEMICAL EQUILIBRIUM]

Answer 1

28 ) H2SO4 → H+ + HSO4- => K1 = 2 × 10²
so,

again,
SO4^-2 + 2H+ → H2SO4 => K2 = 5 × 10^-5

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add both equations
SO4^-2 + H+ → HSO4- => K' = k1k2
now,
take reverse of this reaction ,
HSO4- → H+ + SO4^-2
K = 1/K'
= 1/K1K2
=1/(2 × 10² × 5 × 10^-5 )
=1/( 10^-2 )
=10²
option A is correct .


30) A → B ; K1
B → C ; K2
C→ D ; K3

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add all of these ,
A + B + C → B + C + D ; K4 = k1.k2.k3
A → D ; K4 = K1.k2.k3

so, D → A ; K = 1/k4 = 1/k1.k2.k3
option ( b) is correct