GUJCET 2019 Chemistry Solved Paper

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Question : 39 of 40

Marks: +1, -0

Which of the following reaction is used to prepare colloidal sol by double decomposition?

As2O3+3H2S → As2S3+3H2O
2AuCl3.3HCHO+3H2O → 2Au + 3HCOOH + 6HCl
SO2+2H2S → 3S + 2H2O
FeCl3+3H2O → Fe(OH)3 + 3HCl

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