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Consider the Fe(OH)3 sols obtained by the following methods:

(I) FeCl3 is added to excess of hot water and colloidal solution X is obtained

(II) FeCl3 is added to NaOH and colloidal solution Y is obtained

The charge on the colloidal particles present in X and Y are respectively

Option: 1

Positive, Positive


Option: 2

Positive, Negative


Option: 3

Negative, Positive


Option: 4

Negative, Negative


Answers (1)

best_answer

When \mathrm{FeCl_3} is added to hot water, then the precipitate of hydrated ferric oxide adsorbs \mathrm{Fe^{3+}} and a postively charged sol is obtained as represented

                        \mathrm{Fe_2O_3.xH_2O/Fe^{3+}}

However, when \mathrm{FeCl_3} is added to NaOH, then the precipitate of hydrated ferric oxide adsorbs \mathrm{OH^{-}} and a negatively charged sol is obtained as represented

                        \mathrm{Fe_2O_3.xH_2O/OH^{-}}

Hence, the correct answer is Option(2)

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manish painkra

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