Explanation :
7) here KCl and CaCl2 , RbCl are the salts of strong acid and strong base . so pH around 7. AlCl3 is the salt of strong acid and weak base . so pH < 7
8)
H2Se -------------> HSe- + H+
0.20 0 0
0.20 - x x x
Ka1 = x^2 / 0.20 - x
1.3 x 10^-4 = x^2 / 0.20 - x
x = 5.1 x 10^-3
pH = 2.29
9)
concentration of Ba(OH)2 = 125 x 0.02 / 250 = 0.01
[OH-] = 0.02 M
pOH = 1.70
pH = 12.30
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