Please answer all the questions

Dear student,
The answer to your first question is below please ask rest of the queries in next thread.
The chemical reaction that is taking place can be written as follows:

3H2S + 8HCl + K2Cr2O7 →→2CrCl3 + 7H2O+ 3S + KCl

Milkiness in the solution is due to the formation of elemental S in solution. But the colour of the solution is green because of CrCl3  


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