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0.2 mol each of AgCl and NaCl are heated...

0.2 mol each of AgCl and NaCl are heated with conc. `H_2SO_4` in presence of `K_2Cr_2O_7` giving deep red vapours which are dissolved in 30 litre of water.What is pH of the resulting solution ?
[log 2=0.3, log 3=0.48]
Given : `(K_(a_2))_(H_2CrO_4)=10^(-7)` Assume 100% first ionisation of `H_2CrO_4`

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